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POTCP stream being read by Java
 

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  1. POTCP stream being read by Java
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    <p>I would like to create a Java server socket application that receives a TCP packet and reads the content of it. Based on the contents of the packet it will perform several actions. I managed to get to the point where it reads some content and prints a string System.out.println(sb.toString()); But (a) not all the content is printed and (b) I am not sure how to process the content as they arrive in network order. An example would be to receive an HTTP packet and from the header to report the "Content-Length" or the "User-Agent". Any example would be appreciated.</p> <pre><code>public static void main(String[ ] args){ PrintWriter out = null; BufferedReader in = null; int bufferSize = 0; try{ String message = args[0]; int count = 0; ServerSocket connectionSocket = null; try { connectionSocket = new ServerSocket(4444); System.out.println("Server started"); } catch (IOException e) { System.err.println("Could not listen on port: 4444."); System.exit(1); } Socket clientSocket = null; try { while(true){ count++; clientSocket = connectionSocket.accept(); System.out.println("TCP packet received… " + count); InputStream is = clientSocket.getInputStream(); out = new PrintWriter(clientSocket.getOutputStream()); in = new BufferedReader(new InputStreamReader(is)); StringBuilder sb = new StringBuilder(); String line = null; while ((line = in.readLine()) != null) { sb.append(line + "\n"); } System.out.println(sb.toString()); clientSocket.close(); } } catch (IOException e) { System.err.println("Accept failed."); System.exit(1); } } catch(Exception e){ e.printStackTrace(); } } </code></pre>
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    1. PTQuestion
    1. USuser207421
    1. USIoannis Pappas
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    1. COJava alone cannot give you a packet-level interface. You don't 'recieve TCP packets' in java, you just get a data stream. You need to install JPCap, java bindings for the standard packet-capture library.
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      1. POTCP stream being read by Java
      1. USlynks
    2. COI have a script that generates the packet and sends it to the server side (right now both in 'localhost'). I captured it through Wireshark to make sure that the request is correct. So once the script sends the packet to the TCP port 4444 the server reads in the data stream. Do I still need JPcap?
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      1. POTCP stream being read by Java
      1. USIoannis Pappas
    3. COI suspect the OP just wants to be able to process the stream as it arrives.
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      1. POTCP stream being read by Java
      1. USPeter Lawrey
 

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