Server can read, but client doesn't

[Tankske]

Hello,

I'm building a server-client application. Since it is my first time doing that, I first tried to set up a simple connection on my computer. The purpose is to extend it to a real server and my computer.

I used request because I''l expand the program...

Server part

import java.io.*;
import java.net.*;

public class Server {

	
	   public static void main(String [] args) throws IOException {
		   int port = 1234;
		   final ServerSocket serverSocket = new ServerSocket(port);
		   InetAddress address = InetAddress.getLocalHost();
		   System.out.println("Server created: " + address);
		   
		   while(true)
	      {
			 System.out.println("Server waiting for connection...");  
	         try
	         {
	           final Socket connection = serverSocket.accept();
	           Runnable task = new Runnable(){
	        	   public void run(){
	        		   handleWriteRequest(connection);	        		   
	        		   handleReadRequest(connection);

	        		   System.out.println("handled requests with " + serverSocket.getLocalSocketAddress());
						//TODO: controleren want op eigen computer in netwerk niet goed. 
	        	   }
	        	   

				/**
				 * Methode om iets te schrijven
				 * @param connection
				 */
				private void handleWriteRequest(Socket connection) {
					try{
						System.out.println("Server probeert te schrijven");
						PrintWriter out = new PrintWriter(connection.getOutputStream(), true);
						out.write("Test schrijven server");
						System.out.println("Server heeft geschreven");
					} catch (Exception e){
						System.out.println("Probleem met schrijven aan serverzijde");
					}
					
				}

				/**
				 * Methode om iets te lezen
				 * @param connection
				 */
				private void handleReadRequest(Socket connection) {
					try {
						System.out.println("Server probeert te lezen");
						BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
						String input = in.readLine();
						System.out.println(input);
						System.out.println("Server heeft geschreven");
					} catch (IOException e) {
						System.out.println("Probleem met lezen aan serverzijde");
						e.printStackTrace();
					}
					
					
				} 
	           };
	          new Thread(task).start();
	         }catch(SocketTimeoutException s)
	         {
	            System.out.println("Socket timed out!");
	            break;
	         }catch(IOException e)
	         {
	            e.printStackTrace();
	            break;
	         }
	     
	   }
	   }
	
}

Client part

package connection;

import java.io.*;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

public class Client {
	
	 public static void main(String [] args)
	   {
	     
	     try {
//	    	Server.main(null);
//			server.PrepareServer();
//			System.out.println("Server prepared");
		} catch (Exception e1) {
			System.out.println("Cannot prepare server");
		}
		 
		 String serverName = "localhost";
		 InetAddress address = null;
		try {
			address = InetAddress.getByName(serverName);
		} catch (UnknownHostException e1) {
			System.out.println("Problemen met de host");
			e1.printStackTrace();
		}
	      int port = 1234;
	      try
	      {
	         System.out.println("Connecting to " + serverName
	                             + " on port " + port);
	         Socket client = new Socket(address, port);
	         System.out.println("Just connected to "
	                      + client.getRemoteSocketAddress() + "with " + client.getLocalAddress());
	         
	         handleWriteRequest(client);
	         
	         handleReadRequest(client);
	         	         
	         System.out.println("Mission completed");
	         client.close();
	         System.out.println("Disconnecting from server");
	      }catch(IOException e)
	      {
	         System.out.println("Failed to connect with...");
	    	  e.printStackTrace();
	      }
	   }

	 private static void handleReadRequest(Socket client){
    	 try{
    		 System.out.println("Client probeert te lezen...");
	    	 BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
	    	 String input = in.readLine();
	    	 System.out.println(input);
	    	 System.out.println("Client heeft gelezen...");
    	 } catch (Exception e){
    		 System.out.println("Probleem met lezen aan clientzijde");
    	 }      	 
     }
     
     private static void handleWriteRequest(Socket client){
    	 try{
    		 System.out.println("Client probeert te schrijven...");
    		 PrintWriter out = new PrintWriter(client.getOutputStream(), true);
    		 out.println("Test schrijven client");
    		 System.out.println("Client heeft geschreven...");
    	 } catch (Exception e){
    		 System.out.println("Probleem met schrijven aan clientzijde");
    	 }
     }
	
}

You first have to start the server, and then the client(s). The problem is that my client 'hangs' because it waits for a write from the server which he does, but i guess some place wrong or something...

This is my problem...

[eRaaaa]

Client read: String input = in.readLine();
Please read the API Doc :

A line is considered to be terminated by any one
* of a line feed ('\n'), a carriage return ('\r'), or a carriage return
* followed immediately by a linefeed.

And now look at your servers write method:

out.write("Test schrijven server");

no line feed, no carriage return ... so readLine block until it will get it :)

In your client, you have used out.println("Test schrijven client"); , why do you dont use this at your server side? --> out.println("Test schrijven server");

[Tankske]

THANK YOU!!

I knew it had to be something little but I was staring at my screen for an hour and didn't found it.

Thanks a lot...