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POCommunication between client and server got some glitches
 

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  1. POCommunication between client and server got some glitches
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    <p>I got here client and server side programs. Client talks to server by sending a string, the server then converts the string into capital letters and sends back. The problem is that the client does not receive any string from the server. Only the server prints 2 passed in strings, then the server throws IOException. I guess that because client closed connection. But why does client does not receive any message from server? How to overcome this issue? Thanks</p> <pre><code>Client: package solutions; import java.io.*; import java.net.*; class SocketExampleClient { public static void main(String [] args) throws Exception { String host = "localhost"; // hostname of server int port = 5678; // port of server Socket s = new Socket(host, port); DataOutputStream dos = new DataOutputStream(s.getOutputStream()); DataInputStream dis = new DataInputStream(s.getInputStream()); dos.writeUTF("Hello World!"); System.out.println(dis.readUTF()); dos.writeUTF("Happy new year!"); System.out.println(dis.readUTF()); dos.writeUTF("What's the problem?!"); System.out.println(dis.readUTF()); } } </code></pre> <p>Server:</p> <pre><code>package solutions; import java.io.*; import java.net.*; class SocketExampleServer { public static void main(String [] args) throws Exception { int port = 5678; ServerSocket ss = new ServerSocket(port); System.out.println("Waiting incoming connection..."); Socket s = ss.accept(); DataInputStream dis = new DataInputStream(s.getInputStream()); DataOutputStream dos = new DataOutputStream(s.getOutputStream()); String x = null; try { while ((x = dis.readUTF()) != null) { System.out.println(x); dos.writeUTF(x.toUpperCase()); } } catch(IOException e) { System.err.println("Client closed its connection."); } } } </code></pre> <p>Output:</p> <pre><code>Waiting incoming connection... Hello World! Happy new year! What's the problem?! Client closed its connection. </code></pre>
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