FTP in Applet
I have downloaded third party FTP package. I am making a ftp connection in applet using this third party
package. When i run my applet using Appletviewer,
i got the following exception:
java.security.AccessControlException: access denied
I created policy file with full permissions and login details and server details are correct.
what is the problem ?
Pls help me !!
Applets run in a sandbox that prevents them from doing many things, such as connecting to a server other than the one they were loaded from.
You can fix this in a couple of ways. The standard way is to sign the applet, so that the user will agree to allow your applet to do that. The other way, which is pointless in most cases, is to create a policy file (as you did) and to install it in the correct location in the user's computer (which you apparently didn't, and is impractical in the real world anyway).
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Hi I am using a ftp class (known as FTPConnection) that i found on this site: http://www.nsftools.com/tips/JavaFtp.htm , and they only have an example of how to download a File through FTP and not upload one. I am in the proccess of making an FTP upload applet, and need some help on getting upload to work. I also need it to work on both a Pc and mac, so that may be attributing to the problem becuase i am currently on a mac which uses file:// instead of C:\\. Ill post the ftp class, and a snippet of my code that tries to upload a selected file.
FTPConnection
/* <!-- in case someone opens this in a browser... --> <pre> */
* File: FTPConnection.java
* Author: Bret Taylor <[email protected]>
* URL: http://www.stanford.edu/~bstaylor/cs/ftpconnection/FTPConnection.java.shtml
* see also <a href="http://www.nsftools.com/tips/JavaFtp.htm">http://www.nsftools.com/tips/JavaFtp.htm</a>
* $Id$
* Parts of this code were adopted from a variety of other FTP classes the
* author has encountered that he was not completely satisfied with. If you
* think more thanks are due to any particular author than is given, please
* let him know. With that caveat, this class can be freely distributed and
* modified as long as Bret Taylor is given credit in the source code comments.
* Modified by Julian Robichaux -- http://www.nsftools.com
* Added constructors, logout(), listFiles(), listSubdirectories(), getAndParseDirList(),
* processFileListCommand(), and overloaded getFullServerReply().
* Also added StringBuffer parameter options to transferData() and executeDataCommand()
* and did a few other little things.
import java.io.*;
import java.net.*;
import java.util.*;
* <p>A wrapper for the network and command protocols needed for the most common
* FTP commands. Standard usage looks something like this:</p>
* <pre> FTPConnection connection = new FTPConnection();
* try {
* if (connection.connect(host)) {
* if (connection.login(username, password)) {
* connection.downloadFile(serverFileName);
* connection.uploadFile(localFileName);
* connection.disconnect();
* } catch (UnknownHostException e) {
* // handle unknown host
* } catch (IOException e) {
* // handle I/O exception
* }</pre>
* <p>Most FTP commands are wrapped by easy-to-use methods, but in case clients
* need more flexibility, you can execute commands directly using the methods
* <a href="#executeCommand(java.lang.String)">executeCommand</a> and
* <a href="#executeDataCommand(java.lang.String,
* java.io.OutputStream)">executeDataCommand</a>,
* the latter of which is used for commands that require an open data port.</p>
* @author Bret Taylor
* @author Julian Robichaux
* @version 1.01
public class FTPConnection extends Object {
* If this flag is on, we print out debugging information to stdout during
* execution. Useful for debugging the FTP class and seeing the server's
* responses directly.
private static boolean PRINT_DEBUG_INFO = false;
* The socket through which we are connected to the FTP server.
private Socket connectionSocket = null;
private String username;
private String password;
private String host;
* The socket output stream.
private PrintStream outputStream = null;
* The socket input stream.
private BufferedReader inputStream = null;
* The offset at which we resume a file transfer.
private long restartPoint = 0L;
* Added by Julian: If this flag is on, we're currently logged in to something.
private boolean loggedIn = false;
* Added by Julian: This is the line terminator to use for multi-line responses.
public String lineTerm = "\n";
* Added by Julian: This is the size of the data blocks we use for transferring
* files.
private static int BLOCK_SIZE = 4096;
* Added by Julian: After you create an FTPConnection object, you will call the
* connect() and login() methods to access your server. Please don't forget to
* logout() and disconnect() when you're done (it's only polite...).
public FTPConnection ()
// default constructor (obviously) -- this is just good to have...
* Added by Julian: Allows you to specify if you want to send debug output to
* the console (true if you do, false if you don't).
public FTPConnection (boolean debugOut)
PRINT_DEBUG_INFO = debugOut;
public FTPConnection (String user, String pw, String host_)
username=user;
password=pw;
host=host_;
PRINT_DEBUG_INFO = false;
* Prints debugging information to stdout if the private flag
* <code>PRINT_DEBUG_INFO</code> is turned on.
private void debugPrint(String message) {
if (PRINT_DEBUG_INFO) System.err.println(message);
* Connects to the given FTP host on port f, the default FTP port.
public boolean connect(String host)
throws UnknownHostException, IOException
return connect(host, 21);
* Connects to the given FTP host on the given port.
public boolean connect(String host, int port)
throws UnknownHostException, IOException
connectionSocket = new Socket(host, port);
connectionSocket.setSoTimeout(10000);
outputStream = new PrintStream(connectionSocket.getOutputStream());
inputStream = new BufferedReader(new
InputStreamReader(connectionSocket.getInputStream()));
if (!isPositiveCompleteResponse(getServerReply())){
disconnect();
return false;
return true;
* Disconnects from the host to which we are currently connected.
static boolean URLexists(String URLName)
try
HttpURLConnection.setFollowRedirects(false);
// note : you may also need
// HttpURLConnection.setInstanceFollowRedirects(false)
HttpURLConnection con =
(HttpURLConnection) new URL(URLName).openConnection();
con.setRequestMethod("HEAD");
return (con.getResponseCode() == HttpURLConnection.HTTP_OK);
catch (Exception e)
e.printStackTrace();
return false;
public String getSimpleFileName(File f)
String path=f.getPath();
String fileName=path.replace("\\", "/");
int slashPos = fileName.lastIndexOf("/");
fileName=fileName.substring(slashPos+1);
return fileName;
public String verifyFileName(String name)
int count=0;
//String url="http://chris-malcolm.com/images/"+URLEncoder.encode(name).replace("+", "%20");
while (URLexists("http://chris-malcolm.com/images/"+URLEncoder.encode(name).replace("+", "%20"))==true)
count++;
name=FileExt(name)[0]+"-"+count+"."+FileExt(name)[1];
return name;
public String[] FileExt(String fileName)
int dotPos = fileName.lastIndexOf(".");
fileName=fileName.replace("\\", "/");
int slashPos = fileName.lastIndexOf("/");
String extension, name;
if (slashPos==fileName.length()-1)
fileName=fileName.substring(0, fileName.length()-1);
slashPos=fileName.lastIndexOf("/");
extension="/";
name=fileName.substring(slashPos+1);
else if(dotPos==-1)
name=fileName.substring(slashPos+1);
extension="";
else
extension = fileName.substring(dotPos+1);
name=fileName.substring(slashPos+1, dotPos);
String[] output={name, extension};
return output;
String[] output={name, extension};
return output;
public void disconnect()
if (outputStream != null) {
try {
if (loggedIn) { logout(); };
outputStream.close();
inputStream.close();
connectionSocket.close();
} catch (IOException e) {}
outputStream = null;
inputStream = null;
connectionSocket = null;
* Wrapper for the commands <code>user [username]</code> and <code>pass
* [password]</code>.
public boolean login(String username, String password)
throws IOException
int response = executeCommand("user " + username);
if (!isPositiveIntermediateResponse(response)) return false;
response = executeCommand("pass " + password);
loggedIn = isPositiveCompleteResponse(response);
return loggedIn;
* Added by Julian: Logout before you disconnect (this is good form).
public boolean logout()
throws IOException
int response = executeCommand("quit");
loggedIn = !isPositiveCompleteResponse(response);
return !loggedIn;
* Wrapper for the command <code>cwd [directory]</code>.
public boolean changeDirectory(String directory)
throws IOException
int response = executeCommand("cwd " + directory);
return isPositiveCompleteResponse(response);
* Wrapper for the commands <code>rnfr [oldName]</code> and <code>rnto
* [newName]</code>.
public boolean renameFile(String oldName, String newName)
throws IOException
int response = executeCommand("rnfr " + oldName);
if (!isPositiveIntermediateResponse(response)) return false;
response = executeCommand("rnto " + newName);
return isPositiveCompleteResponse(response);
* Wrapper for the command <code>mkd [directory]</code>.
public boolean makeDirectory(String directory)
throws IOException
int response = executeCommand("mkd " + directory);
return isPositiveCompleteResponse(response);
* Wrapper for the command <code>rmd [directory]</code>.
public boolean removeDirectory(String directory)
throws IOException
int response = executeCommand("rmd " + directory);
return isPositiveCompleteResponse(response);
* Wrapper for the command <code>cdup</code>.
public boolean parentDirectory()
throws IOException
int response = executeCommand("cdup");
return isPositiveCompleteResponse(response);
* Wrapper for the command <code>dele [fileName]</code>.
public boolean deleteFile(String fileName)
throws IOException
int response = executeCommand("dele " + fileName);
return isPositiveCompleteResponse(response);
* Wrapper for the command <code>pwd</code>.
public String getCurrentDirectory()
throws IOException
String response = getExecutionResponse("pwd");
StringTokenizer strtok = new StringTokenizer(response);
// Get rid of the first token, which is the return code
if (strtok.countTokens() < 2) return null;
strtok.nextToken();
String directoryName = strtok.nextToken();
// Most servers surround the directory name with quotation marks
int strlen = directoryName.length();
if (strlen == 0) return null;
if (directoryName.charAt(0) == '\"') {
directoryName = directoryName.substring(1);
strlen--;
if (directoryName.charAt(strlen - 1) == '\"')
return directoryName.substring(0, strlen - 1);
return directoryName;
* Wrapper for the command <code>syst</code>.
public String getSystemType()
throws IOException
return excludeCode(getExecutionResponse("syst"));
* Wrapper for the command <code>mdtm [fileName]</code>. If the file does
* not exist, we return -1;
public long getModificationTime(String fileName)
throws IOException
String response = excludeCode(getExecutionResponse("mdtm " + fileName));
try {
return Long.parseLong(response);
} catch (Exception e) {
return -1L;
* Wrapper for the command <code>size [fileName]</code>. If the file does
* not exist, we return -1;
public long getFileSize(String fileName)
throws IOException
String response = excludeCode(getExecutionResponse("size " + fileName));
try {
return Long.parseLong(response);
} catch (Exception e) {
return -1L;
* Wrapper for the command <code>retr [fileName]</code>.
public boolean downloadFile(String fileName)
throws IOException
return readDataToFile("retr " + fileName, fileName);
* Wrapper for the command <code>retr [serverPath]</code>. The local file
* path to which we will write is given by <code>localPath</code>.
public boolean downloadFile(String serverPath, String localPath)
throws IOException
return readDataToFile("retr " + serverPath, localPath);
* Wrapper for the command <code>stor [fileName]</code>.
public boolean uploadFile(String fileName)
throws IOException
return writeDataFromFile("stor " + fileName, fileName);
* Wrapper for the command <code>stor [localPath]</code>. The server file
* path to which we will write is given by <code>serverPath</code>.
public boolean uploadFile(String serverPath, String localPath)
throws IOException
return writeDataFromFile("stor " + serverPath, localPath);
* Set the restart point for the next download or upload operation. This
* lets clients resume interrupted uploads or downloads.
public void setRestartPoint(int point)
restartPoint = point;
debugPrint("Restart noted");
* Gets server reply code from the control port after an ftp command has
* been executed. It knows the last line of the response because it begins
* with a 3 digit number and a space, (a dash instead of a space would be a
* continuation).
private int getServerReply()
throws IOException
return Integer.parseInt(getFullServerReply().substring(0, 3));
* Gets server reply string from the control port after an ftp command has
* been executed. This consists only of the last line of the response,
* and only the part after the response code.
private String getFullServerReply()
throws IOException
String reply;
do {
reply = inputStream.readLine();
debugPrint(reply);
} while(!(Character.isDigit(reply.charAt(0)) &&
Character.isDigit(reply.charAt(1)) &&
Character.isDigit(reply.charAt(2)) &&
reply.charAt(3) == ' '));
return reply;
* Added by Julian: Returns the last line of the server reply, but also
* returns the full multi-line reply in a StringBuffer parameter.
private String getFullServerReply(StringBuffer fullReply)
throws IOException
String reply;
fullReply.setLength(0);
do {
reply = inputStream.readLine();
debugPrint(reply);
fullReply.append(reply + lineTerm);
} while(!(Character.isDigit(reply.charAt(0)) &&
Character.isDigit(reply.charAt(1)) &&
Character.isDigit(reply.charAt(2)) &&
reply.charAt(3) == ' '));
// remove any trailing line terminators from the fullReply
if (fullReply.length() > 0)
fullReply.setLength(fullReply.length() - lineTerm.length());
return reply;
* Added by Julian: Gets a list of files in the current directory.
public String listFiles()
throws IOException
return listFiles("");
* Added by Julian: Gets a list of files in either the current
* directory, or one specified as a parameter. The 'params' parameter
* can be either a directory name, a file mask, or both (such as
* '/DirName/*.txt').
public String listFiles(String params)
throws IOException
StringBuffer files = new StringBuffer();
StringBuffer dirs = new StringBuffer();
if (!getAndParseDirList(params, files, dirs))
debugPrint("Error getting file list");
return files.toString();
* Added by Julian: Gets a list of subdirectories in the current directory.
public String listSubdirectories()
throws IOException
return listSubdirectories("");
* Added by Julian: Gets a list of subdirectories in either the current
* directory, or one specified as a parameter. The 'params' parameter
* can be either a directory name, a name mask, or both (such as
* '/DirName/Sub*').
public String listSubdirectories(String params)
throws IOException
StringBuffer files = new StringBuffer();
StringBuffer dirs = new StringBuffer();
if (!getAndParseDirList(params, files, dirs))
debugPrint("Error getting dir list");
return dirs.toString();
* Added by Julian: Sends and gets the results of a file list command,
* like LIST or NLST.
private String processFileListCommand(String command)
throws IOException
StringBuffer reply = new StringBuffer();
String replyString;
// file listings require you to issue a PORT command,
// like a file transfer
boolean success = executeDataCommand(command, reply);
if (!success)
return "";
replyString = reply.toString();
// strip the trailing line terminator from the reply
if (reply.length() > 0)
return replyString.substring(0, reply.length() - 1);
} else {
return replyString;
* Added by Julian: Gets a directory list from the server and parses
* the elements into a list of files and a list of subdirectories.
private boolean getAndParseDirList(String params, StringBuffer files, StringBuffer dirs)
throws IOException
// reset the return variables (we're using StringBuffers instead of
// Strings because you can't change a String value and pass it back
// to the calling routine -- changing a String creates a new object)
files.setLength(0);
dirs.setLength(0);
// get the NLST and the LIST -- don't worry if the commands
// don't work, because we'll just end up sending nothing back
// if that's the case
String shortList = processFileListCommand("nlst " + params);
String longList = processFileListCommand("list " + params);
// tokenize the lists we got, using a newline as a separator
StringTokenizer sList = new StringTokenizer(shortList, "\n");
StringTokenizer lList = new StringTokenizer(longList, "\n");
// other variables we'll need
String sString;
String lString;
// assume that both lists have the same number of elements
while ((sList.hasMoreTokens()) && (lList.hasMoreTokens())) {
sString = sList.nextToken();
lString = lList.nextToken();
if (lString.length() > 0)
if (lString.startsWith("d"))
dirs.append(sString.trim() + lineTerm);
debugPrint("Dir: " + sString);
} else if (lString.startsWith("-")) {
files.append(sString.trim() + lineTerm);
debugPrint("File: " + sString);
} else {
// actually, symbolic links will start with an "l"
// (lowercase L), but we're not going to mess with
// those
debugPrint("Unknown: " + lString);
// strip off any trailing line terminators and return the values
if (files.length() > 0) { files.setLength(files.length() - lineTerm.length()); }
if (dirs.length() > 0) { dirs.setLength(dirs.length() - lineTerm.length()); }
return true;
* Executes the given FTP command on our current connection, returning the
* three digit response code from the server. This method only works for
* commands that do not require an additional data port.
public int executeCommand(String command)
throws IOException
outputStream.println(command);
return getServerReply();
* Executes the given FTP command on our current connection, returning the
* last line of the server's response. Useful for commands that return
* one line of information.
public String getExecutionResponse(String command)
throws IOException
outputStream.println(command);
return getFullServerReply();
* Executes the given ftpd command on the server and writes the results
* returned on the data port to the file with the given name, returning true
* if the server indicates that the operation was successful.
public boolean readDataToFile(String command, String fileName)
throws IOException
// Open the local file
RandomAccessFile outfile = new RandomAccessFile(fileName, "rw");
// Do restart if desired
if (restartPoint != 0) {
debugPrint("Seeking to " + restartPoint);
outfile.seek(restartPoint);
// Convert the RandomAccessFile to an OutputStream
FileOutputStream fileStream = new FileOutputStream(outfile.getFD());
boolean success = executeDataCommand(command, fileStream);
outfile.close();
return success;
* Executes the given ftpd command on the server and writes the contents
* of the given file to the server on an opened data port, returning true
* if the server indicates that the operation was successful.
public boolean writeDataFromFile(String command, String fileName)
throws IOException
// Open the local file
RandomAccessFile infile = new RandomAccessFile(fileName, "r");
// Do restart if desired
if (restartPoint != 0) {
debugPrint("Seeking to " + restartPoint);
infile.seek(restartPoint);
// Convert the RandomAccessFile to an InputStream
FileInputStream fileStream = new FileInputStream(infile.getFD());
boolean success = executeDataCommand(command, fileStream);
infile.close();
return success;
* Executes the given ftpd command on the server and writes the results
* returned on the data port to the given OutputStream, returning true
* if the server indicates that the operation was successful.
public boolean executeDataCommand(String command, OutputStream out)
throws IOException
// Open a data socket on this computer
ServerSocket serverSocket = new ServerSocket(0);
if (!setupDataPort(command, serverSocket)) return false;
Socket clientSocket = serverSocket.accept();
// Transfer the data
InputStream in = clientSocket.getInputStream();
transferData(in, out);
// Clean up the data structures
in.close();
clientSocket.close();
serverSocket.close();
return isPositiveCompleteResponse(getServerReply());
* Executes the given ftpd command on the server and writes the contents
* of the given InputStream to the server on an opened data port, returning
* true if the server indicates that the operation was successful.
public boolean executeDataCommand(String command, InputStream in)
throws IOException
// Open a data socket on this computer
ServerSocket serverSocket = new ServerSocket(0);
if (!setupDataPort(command, serverSocket)) return false;
Socket clientSocket = serverSocket.accept();
// Transfer the data
OutputStream out = clientSocket.getOutputStream();
transferData(in, out);
// Clean up the data structures
out.close();
clientSocket.close();
serverSocket.close();
return isPositiveCompleteResponse(getServerReply());
* Added by Julian: Executes the given ftpd command on the server
* and writes the results returned on the data port to the given
* StringBuffer, returning true if the server indicates that the
* operation was successful.
public boolean executeDataCommand(String command, StringBuffer sb)
throws IOException
// Open a data socket on this computer
ServerSocket serverSocket = new ServerSocket(0);
if (!setupDataPort(command, serverSocket)) return false;
Socket clientSocket = serverSocket.accept();
// Transfer the data
InputStream in = clientSocket.getInputStream();
transferData(in, sb);
// Clean up the data structures
in.close();
clientSocket.close();
serverSocket.close();
return isPositiveCompleteResponse(getServerReply());
* Transfers the data from the given input stream to the given output
* stream until we reach the end of the stream.
private void transferData(InputStream in, OutputStream out)
throws IOException
byte b[] = new byte[BLOCK_SIZE];
int amount;
// Read the data into the file
while ((amount = in.read(b)) > 0) {
out.write(b, 0, amount);
* Added by Julian: Transfers the data from the given input stream
* to the given StringBuffer until we reach the end of the stream.
private void transferData(InputStream in, StringBuffer sb)
throws IOException
byte b[] = new byte[BLOCK_SIZE];
int amount;
// Read the data into the StringBuffer
while ((amount = in.read(b)) > 0) {
sb.append(new String(b, 0, amount));
* Executes the given ftpd command on the server and writes the results
* returned on the data port to the given FilterOutputStream, returning true
* if the server indicates that the operation was successful.
private boolean setupDataPort(String command, ServerSocket serverSocket)
throws IOException
// Send our local data port to the server
if (!openPort(serverSocket)) return false;
// Set binary type transfer
outputStream.println("type i");
if (!isPositiveCompleteResponse(getServerReply())) {
debugPrint("Could not set transfer type");
return false;
// If we have a restart point, send that information
if (restartPoint != 0) {
outputStream.println("rest " + restartPoint);
restartPoint = 0;
// TODO: Interpret server response here
getServerReply();
// Send the command
outputStream.println(command);
return isPositivePreliminaryResponse(getServerReply());
* Get IP address and port number from serverSocket and send them via the
* <code>port</code> command to the ftp server, returning true if we get a
* valid response from the server, returning true if the server indicates
* that the operation was successful.
private boolean openPort(ServerSocket serverSocket)
throws IOException
int localport = serverSocket.getLocalPort();
// get local ip address
InetAddress inetaddress = serverSocket.getInetAddress();
InetAddress localip;
try {
localip = inetaddress.getLocalHost();
} catch(UnknownHostException e) {
debugPrint("Can't get local host");
return false;
// get ip address in high byte order
byte[] addrbytes = localip.getAddress();
// tell server what port we are listening on
short addrshorts[] = new short[4];
// problem: bytes greater than 127 are printed as negative numbers
for(int i = 0; i <= 3; i++) {
addrshorts[i] = addrbytes;
if (addrshorts[i] < 0)
addrshorts[i] += 256;
outputStream.println("port " + addrshorts[0] + "," + addrshorts[1] +
"," + addrshorts[2] + "," + addrshorts[3] + "," +
((localport & 0xff00) >> 8) + "," +
(localport & 0x00ff));
return isPositiveCompleteResponse(getServerReply());
* True if the given response code is in the 100-199 range.
private boolean isPositivePreliminaryResponse(int response)
return (response >= 100 && response < 200);
* True if the given response code is in the 300-399 range.
private boolean isPositiveIntermediateResponse(int response)
return (response >= 300 && response < 400);
* True if the given response code is in the 200-299 range.
private boolean isPositiveCompleteResponse(int response)
return (response >= 200 && response < 300);
* True if the given response code is in the 400-499 range.
private boolean isTransientNegativeResponse(int response)
return (response >= 400 && response < 500);
* True if the given response code is in the 500-5ok i tried explaining th eproblem in the previous post, but i apologize if my explanation was poor. anyways, i tried to look into it further by doing a printStackTrace() and believe it may be a read error. here is my new updated snippet, and also a link to a screenshot ([click here for screenshot|http://img143.imageshack.us/my.php?image=picture4qr0.png]) of what the error looks like on my end. it seems like a socket is not being read, or maybe it is initialized properly. Again I apologize if my problem is vague, but I do appreciate your input. thanks.
updated code snippet
public void uploadFiles()
statusLabel.setVisible(true);
errorLabel.setVisible(true);
uploadButton.setVisible(false);
footer.setVisible(false);
holdingPanel.setVisible(false);
pbar.setVisible(true);
pbar = new JProgressBar();
pbar.setMinimum(0);
float Total=0;
for (int i=0; i<fileLengths.size(); i++)
if(((java.lang.Boolean)model.getValueAt(i,1)).toString().equals("true"))
Total+=Float.parseFloat((String)fileLengths.get(i));
pbar.setMaximum((int)Total);
String info="";
try
ftp=new FTPConnection(false);
ftp.connect("ftp.chris-malcolm.com");
if (ftp.login("chrismal", "***"))
statusLabel.setText("Status: Connected.");
info+="Successfully logged in!\n";
info+="System type is: " + ftp.getSystemType()+"\n";
info+="Current directory is: " + ftp.getCurrentDirectory()+"\n";
if (ftp.changeDirectory("/www/images/"))
info+="directory changed to: " + ftp.getCurrentDirectory()+"\n";
try
for (int i=0; i<allFiles.size(); i++)
if(((java.lang.Boolean)model.getValueAt(i,1)).toString().equals("true"))
String f=client.verifyFileName((String)model.getValueAt(i,0));
String f2=""+((File)allFiles.get(i)).getPath();
info+="filename: "+f2+"\n";
if (ftp.uploadFile(f2))
statusLabel.setText("Status: Uploading "+f+" - "+i+" of "+calculateTotalFiles()+" files(s)");
pbar.setValue(Integer.parseInt((String)fileLengths.get(i)));
else
errorLabel.setText("Error occured while uploading"+f2+"\n");
catch(Exception de)
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
de.printStackTrace(pw);
pw.close();
//errorLabel.setText("<html>ERROR:"+sw.toString().replace("\n", "<br>")+"</html>");
info+="Error: "+de.getMessage()+"\n";
info+="Trace: "+sw+"\n";
try { ftp.disconnect(); statusLabel.setText("Status: disconnected.");} catch(Exception e2) {};
else
info+="could not change directory\n";
else
info+="could not login";
catch (Exception e)
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
e.printStackTrace(pw);
pw.close();
info+="Error: "+e.getMessage()+"\n";
info+="Trace: "+sw+"\n";
try { ftp.disconnect(); statusLabel.setText("Status: disconnected.");} catch(Exception e2) {};
errorLabel.setText("ERROR:"+info);
JOptionPane.showMessageDialog(this, info, "test", JOptionPane.PLAIN_MESSAGE);
try { ftp.disconnect(); statusLabel.setText("Status: disconnected.");} catch(Exception e2) {};
Edited by: cjm771 on Jul 13, 2008 7:23 PM -
Problem with cz.dhl.ftp.Ftp.class
In order to bypass a nasty HTTP upload problem at my cheap hoster, I want to use a java ftp upload control. I've stumbled upon http://jvftp.sourceforge.net/ (which is LGPL-equived) but can't get it up and running.
I know a fair bit about js & ajax, but nexttonothing about java..
Hope you can help a bit..
First, i'm confused about which version to use. There's a plain jvFtp.jar, and a jvFtp-AWT.jar and a jvftplib.jar. The documentation (http://jvftp.sourceforge.net/docs/api/) isnt clear on what to use when, and how, from a browser perspective.
The current error i'm stuck at is
exception: java.lang.ClassCastException: dz.dhl.ftp.Ftp
my applet code reads
<applet code='cz/dhl/ftp/Ftp.class' archive='<?=MB_CODE_URL?>lib/jvftp.jar' codebase='.' style='width:400px; height:250px;'> </applet>
If you need any more info i'm happy to provide it..Oh, the only other thing i could find on google about this, is an apparently incomplete and slightly buggy howto;
http://www.velocityreviews.com/forums/showpost.php?p=570401&postcount=6 -
Ftp works for start() but not for custom procedure sendFile()
Hello,
i'm busy building an ftp upload applet by using sun's ftp class sun.net.ftp.FtpClient and by including my applet in a signed jar.
Now here's my problem. The code i have to ftp works fine when i put it into the applet's start() or init() procedures, but when i put the code into public void sendFile() and i call this procedure from javascript, it does call the procedure fine (i can check this by incrementing my progress bar - just for debug purposes), but seems to hang at a specific point when i try and get the length of the file (see the code). Here is the code that works in the start() procedure but not my sendFile procedure.
public void sendFile() {
try {
ftpclient = new FtpClient(server);
ftpclient.login(user, password);
ftpclient.cd(dir);
ftpclient.binary();
progress.setPercentOn(true);
byte abyte0[] = new byte[1024];
File file1 = new File(file);
// Applet seems to be hanging here?
long l = file1.length();
in = new FileInputStream(file);
out = ftpclient.put(filename);
long l1 = 0L;
while(blncheck == true)
int i = in.read(abyte0);
if(i < 0) break;
out.write(abyte0, 0, i);
l1 += i;
long l2 = l1 * 100L;
long l3 = l2 / l;
progress.setValue(l3);
out.close();
in.close();
} catch(Exception e) {
e.printStackTrace();
}Any idea why this code would only work in the applets start() and init() procedures?
Help would be much appreciated
HagenOk, the problem is with security. As soon as the html button accesses the applet, the following exception is thrown
java.security.AccessControllException: access denied(java.io.FilePermission C:\blah.txt read)So my plan is to try and not use html but JButtons, then the signed applet shouldn't have a problem anymore -
Why would code work for an application but not an applet?
Hey there,
i'm trying to build a java ftp upload applet. I'm using the enterprisedt ftp class.
The code works fine when i run it as an application but not when i put it in the applet. The applet has been signed and is running off a plug in. I get no error messages, just nothing happens.
Would really appreciate some comments.
regards
hagen
the code
FTPClient ftp = new FTPClient("****");
ftp.login("user1", "***");
ftp.put("C:/INSTALL.log","test.log");hi
im a manuel, from argentina
i would appreciate too much if you can give me that piece of code
i need for a site, an applet that could read files the visitor chosse from his pc and then upload that files to a server
is it possible?? you could help me ?
i think i need to sing my applet alright? how i do this? how it cost??
if anyone can give my a bit of code, to star�t programming, ill be very happy!
thanks!
mi mail: [email protected] -
Hi,
I am writing a java applet for an client. The applet will reside on the server and when a user will execute it, it will list the connected readers from the computer and will read it's smart card's data when he selects a reader from his choice. So far it is done. Now another portion of the work is that this data should be written on the FTP server in the form of a file. Now problem is applets executes on the client side and I have to have provide some mechanism by which i could write files on the FTP server. I am using the following code for this:
URL url = new URL("ftp://xyx.it:[email protected]/httpdocs/abc_direc/test.txt1;type=i");
URLConnection urlconnection = url.openConnection();
OutputStream outputstreamObj = urlconnection.getOutputStream();
String datatoWrite= "Texting strings to write";
outputstreamObj.write(datatoWrite.getBytes());
outputstreamObj.close();
Code the working fine but as you can see i have to provide FTP credentials into the code. Now my client is asking that how I will change it when later if he needed and 2ndly if I will provide a file to put credentials information then he has security concerns that it can be read by someone.
Here I am asking your experts suggestions that how should i do it so that both concerns of my client that is:
1. changing credentials (FTP address,username & password) later on without recompiling the code
2. Security concerns
can be fulfilled.
Many ThanksThanks,
But when i sign my archive and jar files,
why i need to implement a SecurityManager or is that a wrong information.
And when i want the applet also used by Netscape Users is it enough to sign the applet or must i implemet the netscape.security.PrivilegeManager ??
I want that when the applet started a window pop up and ask the user if he support the Applet functionality.
So he only said yes and it will run -
Hi,
I have a java applet that ftps files back to a server. It is correctly signed and can access files on the hard drive.
When downloaded and run as a local applet it works fine, however when downloaded as a remote applet it just hangs at the line
FTPClient ftp = new FTPClient();
No error messages, no clue, just gets no further than that.
Apologies if this is a bit vague or missing any vital information, but java isn't really my thing....
Cheers
RalphThanks, I'm running 1.6.0_12.
No, FF has the option but nothing happens when I click on it. I just upgraded today from v3.5.x because under that version the option is there but when clicked on it deactivates the option. I first tried upgrading to the latest console plugin for FF. As soon as I installed it and FF restarted it said that it was desupported and next time it re-started it just does nothing as I said. So I upgraded to v3.6.13 and re-started and same same. It says it's de-supported. I dunno.
Anyway, I went to the System tray Java icon and right-clicked on it and clicked on properties. Under 'Advanced | Java Console' I see I had it as "hide Console". I changed it to "Show Console". When I started an Applet I got the console. I closed it and now I don't get it again. Weird.
I just cancelled the Java icon in the system tray and restarted it. I checked it back to Hide the Java Console and "Apply", then Show it, and "Apply". Then I started an Applet. No dice. I started it again and Got the Console. But is seems if I close it I can't get it back without all this riggamorole. -
Finding other files in same ftp to use in applet
I have created a signed applet that can access, write, and delete files within the same folder as the jar file containing the class (signed applets require jar files to hold the class). On my computer I use
String dir = getCodeBase().getPath(); to locate whatever directory the jar file may be in, which works. However, when I put everything (jar, files, signed html applet, etc) on my ftp (same setup as on my computer) and try to run the applet online, it cannot find the files. How do I solve this?I see... I am not very familiar with client/server interactions. I have made a very simple text messaging before. However, it only allowed one connection a time. Is it possible to create a server that can receive any number of connections to send data needed for the client's applet and receive specific commands to modify certain data on the server side?
In a very basic example:
A server keeps a Serializable file containing a list of names. Any number of client can visit the applet's web page, which automatically makes the connection to the server. The client is then provided with the list of names and the options (JButtons with JTextFields) to add a name, modify a name, or delete a name which changes the file's information.
If such is possible, could you point me to a tutorial that mainly deals about creating this type of server. -
Allowing file read on user PC to FTP Applets?
Hi! I searched around the forum and found a few posts on something close to what I am looking for.
This is my dilema. I created an applet that will accept parameters from the html file that loads it. The parameters include "user", and "password" required to log into the FTP site and the file paths of the files that the user wants to upload to the site. Well the applet starts and loads some of the awt components and then just stops. No activity. It runs fine in JBuilder 8 (the files are uploaded to the ftp site) but nothing happens if the applet is run in the browser.
I looked around the forum and saw that I need to sign the applet so that it will be allowed to read files on the user PC. Well how exactly do I do this and what do I need to do it?
I would appreciate any help!!!
Thank you in advance!
Leo.All is well! I just had to sign the applet and it works like a charm!
Now I have a different issue though! I tried running the applet on Mac OS 9 and it gives me an error stating that a class has not been difined?
If anyone has any info or suggestions here I would really appreciate the input!
Thanks! -
Could someone kindly tell me if this is possible, and what permissions that applet would need.
I basically want to have an applet FTP files to the server its being hosted on. The applet will need to FTP files to various directories on the server thats hosting the applets.
Thanks in advance....
KirkI've seen something like this in the GNU web site (www.gnu.org)...
But....read the caveat that comes with the Java program
V.V. -
How do I use applet.onScriptStatus?
When we are launching the JVue applet quickly, multiple times in a row, we sometimes get into trouble and the feeling we get is that Java, or something else, at the client side, is pushed too hard. So, we have tried various ways to ask the currently executing viewer instance if it is "ready", or at least "half ready" before launching the next instance. We have had different success with different approaches, all the way from just waiting for X seconds before we launch the next viewer instance, to use methods like applet.waitForLastMethod. We always send in a JavaScript method to the ONINIT parameter of the applet, so that at least we are not trying to load a new instance before the applet is loaded. We have also tried the approach of calling getFileName, and when it returns non-null we at least know the document is loading and we can launch another viewer. The best thing would of course be if we could know then the loading/rendering is 100% complete.
The other day I found this method in the documentation:
ftp://active-project.com/jVue/docs/JavaDocs/VueBean/com/cimmetry/jvue/JVue.html#onScriptStatus(int, java.lang.String, java.lang.Object)
It sounds like this method could be used to "wait" until things have settled down before we give green light to process the next document. But it is not self evident how this method can be used. I have searched the web and can not find one single example on how it is used.
Any ideas?
Thanks!
/MathiasThe onScriptStatus is the implementation of the ScriptStatusListener interface and should not be called from outside.
You may use JVue.setStatusListener(String statusListener) : The statusListener is the name of a JavaScript function that will be called (by onScriptStatus) each time a script command gets executed.
The statusListener parameters are similar to the onScriptStatus params. -
Problem Launching Java Applet with Plug-in: Version 1.4.2_01
Hello out there:
I recently installed j2re-1.4.2_01 on my home computer but have been unable to access Web sites emmploying JAva applets. The following is an email exchange with Jeff Hall of Lowell Observatory, manager of an educational site hosted by Lowell, trying to resolve my problem. The messages are better understood if read in reverse order.
I'm hoping that someone will recognize the source of my problem and can recommmend a solution. I would appreciate any help offered.
Thanks,
Mike Coucke
Hi Jeff:
Well, I guess the problem lies with me somewhere. Here's my answer/status to your questions/suggestions:
1) I'm using MS Windows Me version 4.90.3000
2) I do have the directory C:\Windows\.jpi_cache\jar\, but the only thing in it is an empty folder labeled "1.0". The file LP.jar does not exist anywhere on my hard drive.
3) I tried several game sites that utilized Java applets and got the same results: the Java cup in the upper left corner followed a few seconds later by the red "X". So, evidently the problem is somewhere on my end.
I'm going to post our email exchanges in a Java Users Forum managed by Sun to see if anyone out there can solve my problem. However, if you have any more suggestions, I'll be glad to try them.
Thanks for the help.
Mike Coucke
[email protected]
----- Original Message -----
From: "Jeffrey Hall" <[email protected]>
To: "'Mike Coucke'" <[email protected]>
Sent: Friday, September 05, 2003 1:02 PM
Subject: RE: Registration with Lowell Education Online
Mike,
Rats! What version of Windows are you using? It's a little strange to
see the user directory set to C:\Windows; if you're using XP, I'd expect
it to be something like C:\Documents and Settings\Mike Coucke. In any
event, the output that is of concern is these two lines:
java.lang.ClassNotFoundException: LPRemote.class
Caused by: java.net.UnknownHostException: proxy
It looks like your browser is not finding our server's IP when it comes
time to download the necessary Java code.
LPRemote.class is the fundamental code that runs LOPARC, and your
browser should be downloading it automatically when you click connect.
LPRemote.class is stored along with a bunch of other classes in a file
called "LP.jar" that you download from our server. So, if you go to C:
in Windows Explorer and do a file search for LP.jar, you should find it.
On my machine, it's stored in a directory called ".jpi_cache\jar\" in my
user home directory. Let me know if you have this file, or the
jpi-cache directory.
One other thing you might try is going to a different site that you know
uses Java applets -- I think some of the online game rooms at Yahoo use
Java. See if other sites that use Java load correctly. Then we'll know
if it's our server specifically, or a more general problem on your end.
Jeff Hall
Lowell Observatory
Hello Jeff:
I still have the Java "blues". I followed your instructions, but am still unable to launch a LOPARC session. After an initial failure, I uninstalled all three Java versions I had (1.4.0, 1.4.1, 1.4.2), then reinstalled 1.4.2_01 from the Sun website.
Now, when I try to launch LOPARC, I initially get a blank window with the Java cup in the upper left corner. After about 20 seconds, the cup changes to a red "X". During those 20 seconds, the following appear in the IE message bar at the bottom of the window: "Applet LPRemote notinited" (their spelling) which changes to "Loading Java Applet Failed..." when the red "X" appears.
Following is a copy of the log from my Java Console during all of this:
Java(TM) Plug-in: Version 1.4.2_01
Using JRE version 1.4.2_01 Java HotSpot(TM) Client VM
User home directory = C:\WINDOWS
Proxy Configuration: Manual Configuration
Proxy: http=proxy,https=proxy,ftp=proxy,gopher=proxy
Proxy Overrides:
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
p: reload proxy configuration
q: hide console
r: reload policy configuration
s: dump system properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to <n>
load: class LPRemote.class not found.
java.lang.ClassNotFoundException: LPRemote.class
at sun.applet.AppletClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadCode(Unknown Source)
at sun.applet.AppletPanel.createApplet(Unknown Source)
at sun.plugin.AppletViewer.createApplet(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.net.UnknownHostException: proxy
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at sun.net.NetworkClient.doConnect(Unknown Source)
at sun.plugin.net.protocol.http.HttpClient.doConnect(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.net.www.http.HttpClient.privilegedOpenServer(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.<init>(Unknown Source)
at sun.net.www.http.HttpClient.<init>(Unknown Source)
at sun.plugin.net.protocol.http.HttpClient.<init>(Unknown Source)
at sun.plugin.net.protocol.http.HttpClient.New(Unknown Source)
at sun.plugin.net.protocol.http.HttpURLConnection.createConnection(Unknown Source)
at sun.plugin.net.protocol.http.HttpURLConnection.connect(Unknown Source)
at sun.plugin.net.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at java.net.HttpURLConnection.getResponseCode(Unknown Source)
at sun.applet.AppletClassLoader.getBytes(Unknown Source)
at sun.applet.AppletClassLoader.access$100(Unknown Source)
at sun.applet.AppletClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 10 more
I followed this up by executing the following three console commands:
"dump system properties"
"dump classholder list"
"dump thread list"
and obtained the following listings:
Dump system properties ...
acl.read = +
acl.read.default =
acl.write = +
acl.write.default =
application.home = C:\PROGRA~1\JAVA\J2RE14~1.2_0
awt.toolkit = sun.awt.windows.WToolkit
browser = sun.plugin
browser.vendor = Sun Microsystems, Inc.
browser.version = 1.1
deployment.javaws.cache.dir = C:\WINDOWS\.javaws\cache
deployment.javaws.jre.0.enabled = true
deployment.javaws.jre.0.location = http://java.sun.com/products/autodl/j2se
deployment.javaws.jre.0.osarch = x86
deployment.javaws.jre.0.osname = Windows
deployment.javaws.jre.0.path = C:\Program Files\Java\j2re1.4.2_01\bin\javaw.exe
deployment.javaws.jre.0.platform = 1.4
deployment.javaws.jre.0.product = 1.4.2_01
deployment.javaws.jre.0.registered = true
deployment.javaws.version = javaws-1.4.2_01
deployment.system.cacerts = C:\PROGRA~1\JAVA\J2RE14~1.2_0\lib\security\cacerts
deployment.system.home = C:\WINDOWS\Sun\Java\Deployment
deployment.system.jssecacerts = C:\PROGRA~1\JAVA\J2RE14~1.2_0\lib\security\cacerts
deployment.system.profile = C:\WINDOWS
deployment.system.security.policy = file:/C:/WINDOWS/Sun/Java/Deployment/security/java.policy
deployment.user.cachedir = C:\WINDOWS\Application Data\Sun\Java\Deployment\cache
deployment.user.certs = C:\WINDOWS\Application Data\Sun\Java\Deployment\security\deployment.certs
deployment.user.extdir = C:\WINDOWS\Application Data\Sun\Java\Deployment\ext
deployment.user.home = C:\WINDOWS\Application Data\Sun\Java\Deployment
deployment.user.jssecerts = C:\WINDOWS\Application Data\Sun\Java\Deployment\security\deployment.jssecerts
deployment.user.logdir = C:\WINDOWS\Application Data\Sun\Java\Deployment\log
deployment.user.profile = C:\WINDOWS\Application Data
deployment.user.security.policy = file:/C:/WINDOWS/Application%20Data/Sun/Java/Deployment/security/java.policy
deployment.user.tmpdir = C:\WINDOWS\Application Data\Sun\Java\Deployment\cache\tmp
file.encoding = Cp1252
file.encoding.pkg = sun.io
file.separator = \
file.separator.applet = true
http.agent = Mozilla/4.0 (Windows Me 4.90)
http.auth.serializeRequests = true
https.protocols = SSLv3,SSLv2Hello
java.awt.graphicsenv = sun.awt.Win32GraphicsEnvironment
java.awt.printerjob = sun.awt.windows.WPrinterJob
java.class.path = C:\PROGRA~1\JAVA\J2RE14~1.2_0\classes
java.class.version = 48.0
java.class.version.applet = true
java.endorsed.dirs = C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\endorsed
java.ext.dirs = C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\ext
java.home = C:\PROGRA~1\JAVA\J2RE14~1.2_0
java.io.tmpdir = C:\WINDOWS\TEMP\
java.library.path = D:\PROGRAM FILES\INTERNET EXPLORER 6;.;C:\WINDOWS\SYSTEM;C:\WINDOWS;D:\PROGRA~1\INTERN~1;;C:\WINDOWS;C:\WINDOWS\COMMAND
java.protocol.handler.pkgs = sun.plugin.net.protocol|sun.plugin.net.protocol
java.runtime.name = Java(TM) 2 Runtime Environment, Standard Edition
java.runtime.version = 1.4.2_01-b06
java.specification.name = Java Platform API Specification
java.specification.vendor = Sun Microsystems Inc.
java.specification.version = 1.4
java.util.prefs.PreferencesFactory = java.util.prefs.WindowsPreferencesFactory
java.vendor = Sun Microsystems Inc.
java.vendor.applet = true
java.vendor.url = http://java.sun.com/
java.vendor.url.applet = true
java.vendor.url.bug = http://java.sun.com/cgi-bin/bugreport.cgi
java.version = 1.4.2_01
java.version.applet = true
java.vm.info = mixed mode
java.vm.name = Java HotSpot(TM) Client VM
java.vm.specification.name = Java Virtual Machine Specification
java.vm.specification.vendor = Sun Microsystems Inc.
java.vm.specification.version = 1.0
java.vm.vendor = Sun Microsystems Inc.
java.vm.version = 1.4.2_01-b06
javaplugin.maxHeapSize = 96m
javaplugin.nodotversion = 142_01
javaplugin.proxy.config.list = http=proxy,https=proxy,ftp=proxy,gopher=proxy
javaplugin.proxy.config.type = manual
javaplugin.version = 1.4.2_01
javaplugin.vm.options = -Djava.class.path=C:\PROGRA~1\JAVA\J2RE14~1.2_0\classes -Xbootclasspath/a:C:\PROGRA~1\JAVA\J2RE14~1.2_0\lib\plugin.jar -Xmx96m -Djavaplugin.maxHeapSize=96m -Xverify:remote -Djavaplugin.version=1.4.2_01 -Djavaplugin.nodotversion=142_01 -Dbrowser=sun.plugin -DtrustProxy=true -Dapplication.home=C:\PROGRA~1\JAVA\J2RE14~1.2_0 -Djava.protocol.handler.pkgs=sun.plugin.net.protocol
line.separator = \r\n
line.separator.applet = true
os.arch = x86
os.arch.applet = true
os.name = Windows Me
os.name.applet = true
os.version = 4.90
os.version.applet = true
package.restrict.access.netscape = false
package.restrict.access.sun = true
package.restrict.definition.java = true
package.restrict.definition.netscape = true
package.restrict.definition.sun = true
path.separator = ;
path.separator.applet = true
sun.arch.data.model = 32
sun.boot.class.path = C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\rt.jar;C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\i18n.jar;C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\sunrsasign.jar;C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\jsse.jar;C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\jce.jar;C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\charsets.jar;C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\classes;C:\PROGRA~1\JAVA\J2RE14~1.2_0\lib\plugin.jar
sun.boot.library.path = C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\bin
sun.cpu.endian = little
sun.cpu.isalist = pentium i486 i386
sun.io.unicode.encoding = UnicodeLittle
sun.java2d.fontpath =
sun.net.client.defaultConnectTimeout = 120000
sun.os.patch.level =
trustProxy = true
user.country = US
user.dir = C:\WINDOWS\Desktop
user.home = C:\WINDOWS
user.language = en
user.name = Michael G. Coucke
user.timezone =
user.variant =
Done.
Dump classloader list ...
codebase=http://kraken.lowell.edu/, key=http://kraken.lowell.edu/,IONJava/classes/ion_16.jar,IONJava/classes/LP.jar, zombie=false, cache=true, refcount=1, info=sun.plugin.ClassLoaderInfo@109de5b
Done.
Dump thread list ...
Group main,ac=11,agc=2,pri=10
main,5,alive
AWT-Windows,6,alive,dameon
AWT-Shutdown,5,alive
Java2D Disposer,10,alive,dameon
AWT-EventQueue-0,6,alive
Group Plugin Thread Group,ac=3,agc=0,pri=10
Main Console Writer,6,alive
AWT-EventQueue-1,6,alive
TimerQueue,5,alive,dameon
Group http://kraken.lowell.edu/-threadGroup,ac=2,agc=0,pri=4
thread applet-LPRemote.class,4,alive
AWT-EventQueue-2,4,alive
Done.
I'm not a Java expert, so this may be more information than you ever wanted to see.
Once again, I hope that you can help. My experience has been that I usually have some obscure option set incorrectly and that causes me great grief.
Thanks fo your help,
Mike Coucke
[email protected]
----- Original Message -----
From: "Jeffrey Hall" <[email protected]>
To: "'Mike Coucke'" <[email protected]>
Sent: Thursday, September 04, 2003 11:48 AM
Subject: RE: Registration with Lowell Education Online
Hi Mike,
Try it now. I think this problem has arisen because Sun just
released a new version of the Plug-in (1.4.2), and when we released the
public beta of LOPARC, only one relevant version (1.4.0) was available
and the LOPARC code was written to look for that by default. I have
just recoded the relevant routines so they should now cause your browser
to simply pick up the latest 1.4 version of the Plug-in you have
installed, whatever it is. I "broke" Java on my machine to replicate
your problem, and the code I inserted today did fix it. Hopefully it
will have the same effect for you. I am running IE 6 and plugin
1.4.2_01 (as accessed via Tools->Sun Java Console).
One broader problem: some (non-LOPARC-specific) users on the Sun
forums have reported the "JRE collision" you are seeing when multiple
versions of the Plug-in are installed on the same machine. So if the
fix I made to our code doesn't work, one option would be to uninstall
all Java components from your computer and do a fresh install of the
latest runtime environment.
Let me know how/if this works. Thanks for the feedback and for your
patience.
Best regards,
Jeff Hall
Lowell Observatory
-----Original Message-----
From: Mike Coucke [mailto:[email protected]]
Sent: Wednesday, September 03, 2003 6:30 PM
To: [email protected]
Subject: Re: Registration with Lowell Education Online
Hello Jeff:
So far, I have been unable to launch a LOPARC session. I repeatedly
get the following error message:
"Exception: java.lang.ClassNotFoundException: LPRemote.class"
My browser is MS Internet Explorer version 6.0.2800.1106 Initially I was
using Java Plug-In version 1.4.1 and received the error message. I went
to the Sun website and downloaded/installed Java Plug-In version 1.4.2
and still get the message.
Before I try to launch LOPARC, I can select Tools->Sun Java Console from
IE's pull down menu to check my Java Plug-In version. When I try to
launch LOPARC, I get the following message:
"Applet(s) in this HTML page requires a version of Java different from
the one the browser is currently using. In order to run the applet(s)
in this HTML page, a new browser session is required, press 'Yes' to
start a new browser session." If I select 'No', I get the following
message: "Java Plug-in detected JRE collission"
If I select 'Yes', a new browser window opens and then I get the first
message above.
Can you help?
Mike Coucke
[email protected]
----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Monday, September 01, 2003 5:30 PM
Subject: Registration with Lowell Education Online
September 1, 2003
Dear Michael Coucke:
Thank you for registering with Lowell Observatory's online education
site. We hope you enjoy using it and visit regularly as we continue to
expand its features and capabilities. This is a one-time welcoming
email.
For your records, your user ID is xxxxx, and your password is #########.
You'll need to supply these each time you log in.
This site gives you access to research-grade equipment including a 16"
telescope, CCD detector, and image processing software. Our online
archive of data is now available 24/7. The telescope will be opening to
our onsite users in May, and on select nights to the Internet at large
in June.
We have designed this site so you don't need a huge monitor or a
supercomputer to use it. All pages are viewable on screens running at
800x600 resolution or higher. To use LOPARC, you'll need a Java-enabled
browser with the Java 1.4 plug-in installed. If you don't have the
plug-in, you'll be prompted to download it the first time you attempt to
connect. This is an admittedly large (9 MB) but one-time-only download.
This site works correctly under Internet Explorer version 5 or higher.
If you use Netscape, you must be running version 6 or higher, and
display or applet behavior anomalies may occur.
If at any time you can't connect to our server, simply try again later.
We do experience several power outages each year, particularly during
Flagstaff's summer thunderstorm season. Our server is fully protected
and backed up, and can be quickly brought back on line, but any active
user sessions will be lost. Thanks for your patience during these
inevitable downtimes.
Your questions, comments, suggestions, and bug reports about this site
are always welcome. On behalf of the LOPARC development team, thanks
for signing up!
Jeffrey Hall
Assistant Research Scientist
Associate Director, Education and Special Programs
Lowell Observatory
Flagstaff, ArizonaHi Mike,
I see this in your logs:
Java(TM) Plug-in: Version 1.4.2_01
Using JRE version 1.4.2_01 Java HotSpot(TM) Client VM
User home directory = C:\WINDOWS
Proxy Configuration: Manual Configuration
Proxy: http=proxy,https=proxy,ftp=proxy,gopher=proxy
Proxy Overrides:
I just helped my Dad set up his computer with a new
cable modem, and had the situation where we couldn't
access any secure Web sites. The cable folks had us
disable the proxy. It looks like the error message is
saying it can't find your proxy server, and the logs
you posted say that you've decided to configure your
proxy manually, rather than using the settings from
IE (which is how mine is set up in the plugin
control panel.)
Could that be the problem?
--Steve -
Transferring files from users mashines on the server. Uploading with applet
I'm trying to create applet that would do uploading of user file on the server.
I'm woundering, Is there any ways to use java applet to open a file on user mashine into a stream and transfer it thought socket into
server? Is there any good solution that do uploading with java applet? (I can't use CGI or PHP)
I just noticed that applets don't support FileInputStream. How could I in general get information from user file?
Ok. Thanks for ideas that you gave me. But there are useless. All that I can use is only HTTP. Unfortunately no FTP, no Web Start application.
looking for helpwell, i don't work a lot with applets because of their inherent limitations. but my guess would be that you have to somehow use a signed applet. of course that doesn't help with the FileInputStream problem you are talking about.
if i were going to do it and i couldn't use FTP, i'd write a WebStart app that calls servlets (sending it byte arrays) and the servlets will construct the files on the server...
i have no clue how you are going to do what you want... -
Read file from URL and save to FTP
Hi,
I have worked in java few years back, now I am out of touch. My friend asked me to create an applet program for him which he can use to download a file from remote location to his ftp server.
For e.g.
File
http://www.demo.com/filename.avi
Saved to
ftp://username:password@ftpsite_address/foldername
I was searching for the classes which I can use to achieve this functionality.
To save to FTP
URL url = new URL("ftp://username:[email protected]/folder/filename");
URLConnection urlconnection = url.openConnection();
long l = urlconnection.getContentLength();
OutputStream outputstream = null;
outputstream = urlconnection.getOutputStream();Using the above code I can get the outputstream to which I can write.
I am now stuck here, have some doubts.
What all classes should I use to read a file like
http://www.demo.com/filename.avi
I know I can use URL to open connection to URLS and then streams to read the url.
I am interested in knowing the class which I should use to read any type of file. File can be zip/avi/rar or anything else.
What all method of the class should I use to read the file which will support all type of files.
Which classes should I use to write the files. The files are going to be huge in terms of size.
I have searched everywhere but every place different classes are used.
Any help is appreciated.Ok now I have started coding but facing a problem.
[PHP]try {
URL url = new URL("http://url_to_file/test.txt");
URLConnection urlconnection = url.openConnection();
long l = urlconnection.getContentLength();
fTextArea.append("Content Length = " + l);
BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
String line;
while ((line = in.readLine()) != null)
fTextArea.append("\n"+line);
in.close();
} catch (Exception e) {
fTextArea.append(e);
return;
[PHP]
When I run this code locally it works fine but when run in browser it shows security exception
java.security.AccessControlException: access denied (java.net.SocketPermission site:80 connect,resolve)
What should I do to resolve this error. Sorry for being such a noob but do not have much info about this.
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