Folder transfer over sockets!
How can I transfer folders over the socket?
Also in File transmission is it required to use BufferedInputStream or Output/InputStream alone can do the work?
rameshraj wrote:
How can I transfer folders over the socket?
Also in File transmission is it required to use BufferedInputStream or Output/InputStream alone can do the work?Conceptually yes.
Technically no.
Sockets send data.
A 'folder' represents a resource on the computer. Thus you can no more send that than you can send your physical hard drive.
So conceptually if you wanted to simulate a copy.
1. Design a data structure that allows you to encapsulate the folder structure (folder names, file names, file dates, file contents perhaps file permisions.)
2. Create an API that allows you to create that data structure (fill it in) when pointed to a folder.
3. Create an API that sends that data structure via a socket.
4. Create an API that receives that data structure via a socket.
5. Create an API that takes a data structure and create folders, files, etc from it.
Note that 2-5 are code but 1 is not. And you do not start untile 1 is complete.
Or as an alternative to the above learn how FTP works and use that instead.
Similar Messages
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Synchronizing peers in transfer over Socket
Hi again!
I'm relatively new to Java, so there are many issues I still have to figure out ;-)
Here are two of them:
1) How can peers be synchronized in transfer over Socket? For example:
This is the receiving peer:
DataInputStream dsin = new DataInputStream(socket.getInputStream());
String s = dsin.readUTF();This is the sending peer:
DataOutputStream dsout = new DataOutputStream(socket.getOutputStream());
dsout.writeUTF("something...");
dsout.close();At the receiving peer in some cases the EOFException or SocketException (Socket closed) are raised. I suspect this happens either because the receiver tries to read input before it is fully transfered or when the sender already managed to close the socket's OutputStream.
So how can such a transfer be synchronized?
2) What if both peers close their socket's OutputStream? Does this result in closing the connection and releasing all its resources, such as port?
Thank you everyone!this is what I learnt:Sorry, try again!
DO NOT close the Socket on any endpoint until you make sure that the other endpoint managed to call socket.getInputStream().This 'rule' is quite unnecessary.
According to the documentation, getInputStream() may return a stream which buffer was discarded by network software if a broken connection was detected.That's a complete misreading and misquoting of the documentation. A reset can happen to the connection at any time; can cause loss of data from te socket receive buffer; and has nothing to do with the operation of getting the input stream. Getting the input stream of a socket has nothing to do with the network or the state of the connection. It just constructs a Java object. So this rule is quite pointless.
Even more, it seems to be a good practice not to close the Socket until you are sure that the other endpoint will not try to read from the channel.You've got that back to front as well. THink about that some more and you will see it involves an infinite regression.
The only rules you need are these:
(a) don't close the socket until you're sure the other end has finished writing. You have to close the socket while the other end is still reading, so that it will get a EOS indication, so it will know you've gone away, so it will stop writing and close its end of the socket.
(b) closing the socket or either of its streams closes the other two items. You should always close the topmost output stream of a socket and nothing else. -
Is there anyway to transfer the whole folder including the subfolders
using sockets.
i can transfer the all the files one by one
but it needs lot of coding like making subfolders in the destination and etc.
i need to send a folder using a single outputstream
Thanks
AnanthAnanthakumaran wrote:
tar and untar will take some time Really? Have you measured that?
I'll bet if you look, the time it takes is completely dominated by the need to read the files on one side and write the files on the other. Since any copy program has to do the same thing, this should be no slower than any other method.
and mostly my app is used to transfer large size file
i need something which can send folder like a single file without any >>> overhead >>>Everything you do has overhead. You want to send files and folders over the network. Using tar to serialize that structure has very little overhead. I doubt the overhead will be visible given the need to actually read and write the files.
Darren -
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Hmm...
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hello friends,
I m in need of java code to read text and graphics(lines,circles etc.)from JTextPane and then to transfer this data on sockets to a client.
IF anybody can help,I'll be highly thankful.I need it urgently.i did the follwing when i had a similar requirement...i used java.util.vectors and passed them over sockets to the other end. the advantage of doing this was that I inserted a string ('string_msg') if any text messages were sent or ('graph_pts') if Point objects of the circle or line was sent, as the first element of the vector and the next element was the text-object(StringBuffer) / object[](incase of Point objects) itself.
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try {
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the first element in the vector (used as a handshake) to identify the next element in the vector...
hope this helps! -
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http://www.macworld.com/article/146958/2010/03/move_itunes_windows_mac.html
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mpr130 wrote:
Help Please. I am setting up my macbook pro for a second user but office didn't transfer over. Is there a way to have additional users on the same comp have office available without having to re-install it for each user?
How did you attemp to transfer Office?
OS X Lion: Set up a guest account -
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I would also recommennd giving Apple support a call, to see what they say. -
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Open itunes, connect iphone, select what you want, sync
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File transfer via socket problem (with source code)
I have a problem with this simple client/server filetransfer program. When I run it, only half the file is transfered via the net? Can someone point out to me why this is happening?
Client:
import java.net.*;
import java.io.*;
public class Client {
public static void main(String[] args) {
// IPadressen til server
String host = "127.0.0.1";
int port = 4545;
//Lager streams
BufferedInputStream fileIn = null;
BufferedOutputStream out = null;
// Henter filen vi vil sende over sockets
File file = new File("c:\\temp\\fileiwanttosend.jpg");
// Sjekker om filen fins
if (!file.exists()) {
System.out.println("File doesn't exist");
System.exit(0);
try{
// Lager ny InputStream
fileIn = new BufferedInputStream(new FileInputStream(file));
}catch(IOException eee) {System.out.println("Problem, kunne ikke lage fil"); }
try{
// Lager InetAddress
InetAddress adressen = InetAddress.getByName(host);
try{
System.out.println("- Lager Socket..........");
// �pner socket
Socket s = new Socket(adressen, port);
System.out.println("- Socket klar.........");
// Setter outputstream til socket
out = new BufferedOutputStream(s.getOutputStream());
// Leser buffer inn i tabell
byte[] buffer = new byte[1024];
int numRead;
while( (numRead = fileIn.read(buffer)) >= 0) {
// Skriver bytes til OutputStream fra 0 til totalt antall bytes
System.out.println("Copies "+fileIn.read(buffer)+" bytes");
out.write(buffer, 0, numRead);
// Flush - sender fil
out.flush();
// Lukker OutputStream
out.close();
// Lukker InputStrean
fileIn.close();
// Lukker Socket
s.close();
System.out.println("File is sent to: "+host);
catch (IOException e) {
}catch(UnknownHostException e) {
System.err.println(e);
Server:
import java.net.*;
import java.io.*;
public class Server {
public static void main(String[] args) {
// Portnummer m� v�re det samme p� b�de klient og server
int port = 4545;
try{
// Lager en ServerSocket
ServerSocket server = new ServerSocket(port);
// Lager to socketforbindelser
Socket forbindelse1 = null;
Socket forbindelse2 = null;
while (true) {
try{
forbindelse1 = server.accept();
System.out.println("Server accepts");
BufferedInputStream inn = new BufferedInputStream(forbindelse1.getInputStream());
BufferedOutputStream ut = new BufferedOutputStream(new FileOutputStream(new File("c:\\temp\\file.jpg")));
byte[] buff = new byte[1024];
int readMe;
while( (readMe = inn.read(buff)) >= 0) {
// Skriver filen til disken ut fra input stream
ut.write(buff, 0, readMe);
// Lukker ServerSocket
forbindelse1.close();
// Lukker InputStream
inn.close();
// flush - sender data ut p� nettet
ut.flush();
// Lukker OutputStream
ut.close();
System.out.println("File received");
}catch(IOException e) {System.out.println("En feil har skjedd: " + e.getMessage());}
finally {
try {
if (forbindelse1 != null) forbindelse1.close();
}catch(IOException e) {}
}catch(IOException e) {
System.err.println(e);
}Hi!!
The problem is at this line:
System.out.println("Copies "+fileIn.read(buffer)+" bytes");
Just comment out this line of code and see the difference. This line of code causes another "read" statement to be executed, but you are writing only the data read from the first read statement which causes approximately half the file to be send to the server.
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