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Thread: Send text file over socket

  1. #1
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    Default Send text file over socket

    Hi!

    I'm trying to send a text file over a socket, from client to server, but I doesn't work. I will demonstrate a part of the code that isn't working.

    The critical part of the server look like this:

    while(true) {
                try {
                    Socket socket = fileSocket.accept();
                    out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
                    in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
     
                    String s = in.readLine();

    And the client like this:

    Socket = new Socket(address, number);
                BufferedWriter out = new BufferedWriter(new OutputStreamWriter(Socket.getOutputStream()));
                BufferedReader in = new BufferedReader(new InputStreamReader(Socket.getInputStream()));
     
                BufferedReader fileIn = new BufferedReader(new FileReader(filename));
     
                String s = fileIn.readLine();
                out.write(s);


    Now I want the s in the server to hold the same string as s in the client, but the server can't read the stream - nothing happes.
    I know that readLine() reads until a new line character, but it doesn't word to write and read a single character either.

    Hank


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Send text file over socket

    know that readLine() reads until a new line character
    Does the client send the new line character that the readLine() method needs?
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
    Member andbin's Avatar
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    Default Re: Send text file over socket

    Quote Originally Posted by iHank View Post
                String s = fileIn.readLine();
                out.write(s);
    Here you are writing (on the socket) a string that is not EOL (end-of-line) terminated. But the server expects a "line" (with EOL termination).
    Please, strive to establish a precise well known "protocol".
    Andrea, www.andbin.netSCJP 5 (91%) – SCWCD 5 (94%)

    Useful links for Java beginnersMy new project Java Examples on Google Code

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    Default Re: Send text file over socket

    No, but i does not work to send anything at all. If i want to send an integer:

    while(true) {
                try {
                    Socket socket = fileSocket.accept();
                    out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
                    in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
     
                    int i = in.read();

    And client:

    Socket = new Socket(address, number);
                BufferedWriter out = new BufferedWriter(new OutputStreamWriter(Socket.getOutputStream()));
                BufferedReader in = new BufferedReader(new InputStreamReader(Socket.getInputStream()));
     
                BufferedReader fileIn = new BufferedReader(new FileReader(filename));
     
                int i = 26
                out.write(i);

    I get no error messages...

    --- Update ---

    Seems like I forgot to flush....

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    Member andbin's Avatar
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    Default Re: Send text file over socket

    Quote Originally Posted by iHank View Post
    int i = in.read();
    int i = 26
    out.write(i);
    Note that conceptually here you are writing/reading a "character".

    Quote Originally Posted by iHank View Post
    Seems like I forgot to flush....
    Yes, in general this is another important issue (apart the EOL vs non-EOL I have told before).
    Andrea, www.andbin.netSCJP 5 (91%) – SCWCD 5 (94%)

    Useful links for Java beginnersMy new project Java Examples on Google Code

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