No permission to write files from applets

Dear All,
I wrote one applet for displaying a live video and able to capture a single frame and cine loops. It's working properly.
Now i plug in this applet into my .jsp page. After this I'm facing so many problems.Initially i can't able to store anything
from my applet (after plug in to .jsp). So i edit the java.policy file. Now i can store the single frames captured via my applet. But I'm not able to store the cine loops.
_Following is my java.policy file contents,_
grant codeBase "file:${{java.ext.dirs}}/*" {
     permission java.security.AllPermission;
grant {
     permission java.lang.RuntimePermission "stopThread";
     permission java.net.SocketPermission "localhost:1024-", "listen";
     permission java.util.PropertyPermission "java.version", "read";
     permission java.util.PropertyPermission "java.vendor", "read";
     permission java.util.PropertyPermission "java.vendor.url", "read";
     permission java.util.PropertyPermission "java.class.version", "read";
     permission java.util.PropertyPermission "os.name", "read";
     permission java.util.PropertyPermission "os.version", "read";
     permission java.util.PropertyPermission "os.arch", "read";
     permission java.util.PropertyPermission "file.separator", "read";
     permission java.util.PropertyPermission "path.separator", "read";
     permission java.util.PropertyPermission "line.separator", "read";
     permission java.util.PropertyPermission "java.specification.version", "read";
     permission java.util.PropertyPermission "java.specification.vendor", "read";
     permission java.util.PropertyPermission "java.specification.name", "read";
     permission java.util.PropertyPermission "java.vm.specification.version", "read";
     permission java.util.PropertyPermission "java.vm.specification.vendor", "read";
     permission java.util.PropertyPermission "java.vm.specification.name", "read";
     permission java.util.PropertyPermission "java.vm.version", "read";
     permission java.util.PropertyPermission "java.vm.vendor", "read";
     permission java.util.PropertyPermission "java.vm.name", "read";
     permission java.lang.RuntimePermission "accessClassInPackage.sun.jdbc.odbc";
     permission java.util.PropertyPermission "file.encoding", "read";
          <security>
     <all-permissions/>
     </security>
grant codeBase "file:/D:/Raja/Java/MyProject/AppletEx/build/web/WEB-INF/classes/-" {
permission java.io.FilePermission "<<ALL FILES>>", "read";
permission java.io.FilePermission "<<ALL FILES>>", "write";
I can also sing my applet (self certified). But the problem is not solved.
In my log file i found the following is preventing to write the files.
com.sun.media.JMFSecurityManager.checkFileSave(JMFSecurityManager.java:250)
Can anyone help me to solve this issue..
Regards
ChennaiBee.

To access files (read and write) from an applet, the applet needs to be signed.
There is a forum here to discuss signed applets:
http://forum.java.sun.com/forum.jspa?forumID=63
These instructions (in Part III) for signing applets work:
http://java.sun.com/javase/6/docs/technotes/guides/plugin/developer_guide/contents.html

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Playing an audio file from applet

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I am using j2sdk1.4,windows 2000 server.

Andrew,
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many thanks
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package com.d2e.MyPlugin;
import com.servoy.j2db.scripting.IScriptObject;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.awt.Button;
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import org.xiph.speex.*;
import org.xiph.speex.spi.*;
import sun.audio.*;    //import the sun.audio package
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            final String VERSION = "Java Speex Command Line Encoder v0.9.7 ($Revision: 1.5 $)";
            /** Copyright display String */
            final String COPYRIGHT = "Copyright (C) 2002-2004 Wimba S.A.";
            /** Print level for messages : Print debug information */
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            final int ERROR = 3;
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            final int FILE_FORMAT_RAW = 0;
            /** File format for input or output audio file: Ogg */
            final int FILE_FORMAT_OGG = 1;
            /** File format for input or output audio file: Wave */
            final int FILE_FORMAT_WAVE = 2;
            int srcFormat = FILE_FORMAT_OGG;
            int destFormat = FILE_FORMAT_WAVE;
            int mode       = -1;
            int quality    = 4;
            /** Defines the encoders algorithmic complexity. */
             int complexity = 3;
            /** Defines the number of frames per speex packet. */
             int nframes    = 1;
            /** Defines the desired bitrate for the encoded audio. */
             int bitrate    = -1;
            /** Defines the sampling rate of the audio input. */
             int sampleRate = -1;
            /** Defines the number of channels of the audio input (1=mono, 2=stereo). */
             int channels   = 1;
            /** Defines the encoder VBR quality setting (float from 0 to 10). */
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             boolean vad    = false;
            /** Defines whether or not to use DTX (Discontinuous Transmission). */
             boolean dtx    = false;
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// transfer the file in 4K chunks.
byte[] buffer = new byte[4096];
long byteCnt = 0;
//long percent = 0;
int newPercent = 0;
int oldPercent = 0;
while (true)
int bytes = fis.read(buffer);
byteCnt += bytes;
//11-21-02 :
//If itemID is greater than -1 this is an import file
transfer
//otherwise this is a header graphic file transfer.
if (itemID > -1)
newPercent = (int) ((double) byteCnt/ (double)
fileSize * 100.0);
int diff = newPercent - oldPercent;
if (newPercent == 0 || diff >= 20)
oldPercent = newPercent;
jbInit.getImportTable().displayFileTransferStatus
(itemID,
newPercent);
if (bytes < 0) break;
os.write(buffer, 0, bytes);
os.flush();
if (webadminApplet.DEBUG) System.out.println("No of bytes
sent: " + byteCnt);
finally
// close related streams.
os.close();
fis.close();
if (webadminApplet.DEBUG) System.out.println("File
Transmission complete");
// find out what the servlet has got to say in response.
BufferedReader reader = new BufferedReader(
new
InputStreamReader(serverCon.getInputStream()));
try
String line;
while ((line = reader.readLine()) != null)
if (webadminApplet.DEBUG) System.out.println(line);
finally
// close the reader stream from servlet.
reader.close();
} // end of the big try block.
catch (Exception e)
System.out.println("Exception during file transfer:\n" + e);
e.printStackTrace();
return("FTP failed. See Java Console for Errors.");
} // end of catch block.
return("File: " + fname + " successfully transferred.");
} // end of method transferFile().
} // end of class fileTransferClient
Server side code:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.net.*;
// This servlet class acts as an FTP server to enable transfer of
files
// from client side.
public class FtpServerServlet extends HttpServlet
String ftpDir = "D:\\pub\\FTP\\";
private static final String FILENAME_HEADER = "fileName";
private static final String FILELASTMOD_HEADER = "fileLastMod";
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException,
IOException
doPost(req, resp);
public void doPost(HttpServletRequest req, HttpServletResponse
resp)
throws ServletException,
IOException
// ### for now enable overwrite by default.
boolean overwrite = true;
// get the fileName for this transmission.
String fileName = req.getHeader(FILENAME_HEADER);
// also get the last mod of this file.
String strLastMod = req.getHeader(FILELASTMOD_HEADER);
String message = "Filename: " + fileName + " saved
successfully.";
int status = HttpServletResponse.SC_OK;
System.out.println("fileName from client: " + fileName);
// if filename is not specified, complain.
if (fileName == null)
message = "Filename not specified";
status = HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
else
// open the file stream for the file about to be transferred.
File uploadedFile = new File(fileName);
// check if file already exists - and overwrite if necessary.
if (uploadedFile.exists())
if (overwrite)
// delete the file.
uploadedFile.delete();
// ensure the directory is writable - and a new file may be
created.
if (!uploadedFile.createNewFile())
message = "Unable to create file on server. FTP failed.";
status = HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
else
// get the necessary streams for file creation.
FileOutputStream fos = new FileOutputStream(uploadedFile);
InputStream is = req.getInputStream();
try
// create a buffer. 4K!
byte[] buffer = new byte[4096];
// read from input stream and write to file stream.
int byteCnt = 0;
while (true)
int bytes = is.read(buffer);
if (bytes < 0) break;
byteCnt += bytes;
// System.out.println(buffer);
fos.write(buffer, 0, bytes);
// flush the stream.
fos.flush();
} // end of try block.
finally
is.close();
fos.close();
// set last mod date for this file.
uploadedFile.setLastModified((new
Long(strLastMod)).longValue());
} // end of finally block.
} // end - the new file may be created on server.
} // end - we have a valid filename.
// set response headers.
resp.setContentType("text/plain");
resp.setStatus(status);
if (status != HttpServletResponse.SC_OK)
getServletContext().log("ERROR: " + message);
// get output stream.
PrintWriter out = resp.getWriter();
out.println(message);
} // end of doPost().
} // end of class FtpServerServlet

OK - the problem you describe is definitely what's giving you grief.
The workaround is to use a socket connection and send your own request headers, with the content length filled in. You may have to multi-part mime encode the stream on its way out as well (I'm not about that...).
You can use the following:
http://porsche.cis.udel.edu:8080/cis479/lectures/slides-04/slide-02.html
on your server to get a feel for the format that the request headers need to take.
- Kevin
I get the out of Memory Error on the client side. I
was told that this might be a bug in the URLConnection
class implementation that basically it wont know the
content length until all the data has been written to
the output stream, so it uses an in memory buffer to
store the data which basically causes memory issues..
do you think there might be a workaround of any kind..
or maybe a way that the buffer might be flushed after
a certain size of file has been uploaded.. ?? do you
have any ideas?

Writing binary data to ASP file from applet through URLConnection

Hi Everybody,
I am facing a proble with HttpURLConnection.I want to write some binary data from applet to an ASP file.The other end ASP file read this binary data and process , Here problem is I have opened URLConnection to the page and Created OutputStream and writing byte by Write() method But other end we are not getting bytes...we are not getting error too at java side..can any body help me..do we need to set any property to URLConnection...here I am giving sample code...
OutputStream os;
URL uConnect2;
HttpURLConnection hucConnect2;
uConnect2= new URL("http://webserver/vnc/sendtoserver.asp?"); hucConnect2=(HttpURLConnection)uConnect2.openConnection();
hucConnect2.setDoOutput(true);
hucConnect2.setRequestMethod("POST")
os=new DataOutputStream(hucConnect2.getOutputStream());
os.writeBytes("Hello");
Thanks in Advance
Madhav

Do you remember to flush() and close() the stream?

Writing Image files from Applet to Servlet

How to write ImageFiles from an Applet to a Servlet?
I draw a image on a JComponent in Applet and wanted to save the image file in the server.
I am unable to write an Image Object to the Servlet as the BufferedImage class is not serialized.
I tried writing the image to the Servlet output stream and tried reading the data in the servlet and writing the data to a jpg file.
But the files is not being written as proper jpeg file.
Any help would be great.
Thanks,
Sridhar.

I get the following exception below when i try to write a Serialized object from an applet to the servlet.
I copied the serialized class jar file to the tomcat webserver lib folder.
The serialized class has a BufferedImage object.
Serialized Class Code
public class SerializedImage implements Serializable{
     private BufferedImage im = null;
     public SerializedImage() {
          super();
     public BufferedImage getSerializedObject() {
          return im;
     public void setSerializedObject((BufferedImage im) {
          this.im = im;
     private BufferedImage fromByteArray(byte[] imagebytes) {
          try {
               if (imagebytes != null && (imagebytes.length > 0)) {
                    BufferedImage im = ImageIO.read(new ByteArrayInputStream(imagebytes));
                    return im;
               return null;
          } catch (IOException e) {
               throw new IllegalArgumentException(e.toString());
     private byte[] toByteArray(BufferedImage o) {
          if(o != null) {
               BufferedImage image = (BufferedImage)o;
               ByteArrayOutputStream baos = new ByteArrayOutputStream(1024);
               try {
                    ImageIO.write(image, "jpg", baos);
               } catch (IOException e) {
                    throw new IllegalStateException(e.toString());
               byte[] b = baos.toByteArray();
               return b;
          return new byte[0];
     private void writeObject(java.io.ObjectOutputStream out)
     throws IOException {
          byte[] b = toByteArray(im);
          out.writeInt(b.length);
          out.write(b);
     private void readObject(java.io.ObjectInputStream in)
     throws IOException, ClassNotFoundException {
          int length = in.readInt();
          byte[] b = new byte[length];
          in.read(b);
          im = fromByteArray(b);
Exception :
java.io.StreamCorruptedException: unexpected block data
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1288)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:18
45)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1
646)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
Is there any thing that i am missing or doing wrong?
Thanks,
Sridhar.

Writing local files from applet

Hi, I want to write an image file from an applet (appletviewer) to the local file system. Does anyone have any idea how I can do it? I tried using the FilePermission class but failed in doing so.
Thanx for any help in advance

I need to do this too.
Specifically I need to allow the user of an applet to write (text) files to his own local file system.
The applet displays graphical material to the user and I want the user to be able to type in comments to a text box which are then recorded by the applet - and ideally can be retrieved and used by the applet on subsequent occasions - as well as, of course, being available to the user via other programs.
Presumably I need to use a signed applet.
I want this to be as simple as possible so that the user (who will be unsophisticated) can be on Mac, Windows, Unix, Linux etc.
Anyone know a good reference text or tutorial?
(I am currently working with JAVA 2 fourth ed by Herbert Schildt)
HRT

How to call a .jsp file from Applet

Could any one guide me how to call a .jsp file from a Applet using action Event.
Thanks

http://javaalmanac.com/cgi-bin/search/find.pl?words=URL+post

Help with utl_file (read/write file from local directory)

Need help reading/writing file on local machine from plsql using 10.2 DB.
I am trying to read/write a file from a local directory(laptop) without success.
I have been able to read/write to the database server directory but can't write to directory on local machine.
The utl_file_dir parm has been set to * and the db restarted but I can't get it to work... Here's the plsql statement.
out_file := UTL_FILE.FOPEN ( 'C:\PLSQL', 'TEST.TXT', 'W' ,32767);
Whenever I run it continues to write to c:\PLSQL dir on the database server. Have looked at the "Directory" object and created MY_DIR = C:\PLSQL but it writes to the db server.
Running 10.2 on a remote windows server, running PLSQL using sql*navigator.
Thanks in advance for your help..

I don't see how you expect the server to be able to see your laptop across the network, hack into it and start writing files. Even if it could, what if there is more than one laptop with a C: drive? How would it know which one to write to?
Is there a shared drive on the server you can access via the laptop?

How to read a local file from Applet Code

Hi
I am developing a application and i want to access a local file from the applet
So pls help me in coding for this

You can't do that, at least not with an unsigned applet.
Sign your applet and it should work just like normal file access.

Loading PNG image file from Applet?

Hi All,
My applet running on IE6 and it will often loads 100 PNG image files from a webserver.
Size of PNG file is about 60Kb so 100*60=6000 Kb ~ 6M.
In theory, the applet will took 6M of memory to store all 100 files. In practical, it tooks about
6M* 25 = 150M of memory, that make my applet run in out of memory sometimes.
I know the reason, may be the brower/applet convert the PNG file format to BMP file format before showing on the screen.
So the main point here is the applet should not loads all 100 files into the memory,
it should loads only 10 files at the same time, another 90 files should be cached in memory as PNG file format, not BMP image file format to save the memory usage.
Is this solution possible in applet field?
If it is possible how can I implement it?
And please show me better solution if anys.
Many Thanks.

I know the reason, may be the brower/applet convert the PNG file format to
BMP file format before showing on the screen.This sounds VERY unlikely! Why should the browser do that? And the applet does what you have coded I hope!
Your problem is probably somewhere else. And it has nothing to do with applets I presume. Use a heap analyzer tool to find out what hogs the memory. A thorough code review can't hurt either. If you still thinks it is the images though, then just don't load them all at once then.

How read a file from applet?

Hello.
I have an applet which is in a signed jar file. And a configuration xml file. All I want to do is to put it near the jar file and access to it from applet. But applet cannot find it. I just want to read it simply. Also I don�t want to put it in a specified location on the server and want to have it near the jar file.
Thanks very much.

Check the API doc for Applet (that's java.applet.Applet). You call myApplet.getDocumentBase() to get the base URL (directory). I believe the base URL returned is actually the base URL of the HTML doc which your applet is embedded in. Add your xml filename to the end of the path. Then look at the API doc for java.net.URLConnection. You can call myURLConnection.getInputStream() to get an input stream of your xml.
Nick

No permission to write files from applets

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