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POCommunication between Client and Server using Sockets
 

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    <p>Okay this is a revised question from earlier today, I have included code to help explain the problem. I am sending two messages from the client to the server. The server then picks the messages up and processes them. The server finally attempts to send a message back to the client(please note in the server code "testmessage"), it is here I am having problems. Either I am not recieving the message at the client side or sending it incorrectly from the server side.</p> <pre><code>public class ClientConnection { String address, language, message; int portNumber; Socket clientSocket = null; public ClientConnection(String lan, String mes, String add, int pn) throws IOException{ address = add; portNumber = pn; language = lan; message = mes; } public String createAndSend() throws IOException{ // Create and connect the socket Socket clientSocket = null; clientSocket = new Socket(address, portNumber); PrintWriter pw = new PrintWriter(clientSocket.getOutputStream(),true); BufferedReader br = new BufferedReader(new InputStreamReader(clientSocket.getInputStream())); // Send first message - Message is being correctly received pw.write(language+"\n"); pw.flush(); // Send off the data // Send the second message - Message is being correctly received pw.write(message); pw.flush(); pw.close(); // Send off the data // NOTE: Either I am not receiving the message correctly or I am not sending it from the server properly. String translatedMessage = br.readLine(); br.close(); //Log.d("application_name",translatedMessage); Trying to check the contents begin returned from the server. return translatedMessage; } </code></pre> <p>Server Code:</p> <pre><code>public class ServerConnection { public static void main(String[] args) throws Exception { // Delete - Using while loop to keep connection open permanently. boolean status = false; while( !status){ ServerSocket serverSocket = null; try { serverSocket = new ServerSocket(4444); } catch (IOException e) { System.err.println("Could not listen on port: 4444."); System.exit(1); } Socket clientSocket = null; try { clientSocket = serverSocket.accept(); } catch (IOException e) { System.err.println("Accept failed."); System.exit(1); } // Delete - Working as of here, connection is established and program runs awaiting connection on 4444 BufferedReader br = new BufferedReader(new InputStreamReader(clientSocket.getInputStream())); String language = br.readLine(); String message = br.readLine(); // Test - Works System.out.println(language); // Test - Works System.out.println(message); // Delete - Working as of here, both messages are passed and applied. Messages are received as sent from client. TranslateMessage tm = new TranslateMessage(); String translatedMessage = tm.translateMessage(language, message); // NOTE: This seems to be where I am going wrong, either I am not sending the message correctly or I am not receiving it correctly.. // PrintWriter writer = new PrintWriter(new BufferedOutputStream(clientSocket.getOutputStream())); PrintWriter pw = new PrintWriter(clientSocket.getOutputStream(),true); // Send translation back System.out.println(translatedMessage); // pw.write(translatedMessage+"\n"); pw.write("Return test"); // Test message! pw.flush(); // Send off the data pw.close(); br.close(); clientSocket.close(); serverSocket.close(); } } } </code></pre> <p>The code is a bit of a mess and I can see a few duplicates, I have commented where I feel the problems occour. </p> <p>Thanks for any help!</p>
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    1. USLondon Student
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    1. COWhat is returned by the readline in the client? is it a null?
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      1. USJim Morris
    2. CONo its a String, though in this example It should be "String test" sent from the server.
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      1. USLondon Student
    3. COI'd still stick a \n on the `pw.write("Return test\n")` just to eliminate it as an issue.
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      1. POCommunication between Client and Server using Sockets
      1. USJim Morris
 

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