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PORe-use a java socket client once again
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copied!<p>My question is very simple. I just want to use a client object socket once again.</p> <p>Typically people create a new socket any time the client tries to connect the server such:</p> <pre><code> Socket test = new Socket (host, port); OutputStream out = test.getOutputStream (); InputStream in = test.getInputStream (); out.writeObject (object) out.flush (); in.readObject(); </code></pre> <p>After the first writeObject I do want again to send more information to the server by reusing out.writeObject(nextObject) however the server is no longer reached. In order to get it working I have to go through all the steps above. Why?</p> <hr> <p>Here is the code I am using to test what I meant. The code after "Second Request doesn't ..." does not reach the server. However if I remove the comments just above those comments it will go through. Why cannot I re-use the same client socket object without having to use new Socket ().</p> <pre><code>Class Hello -> Data passed between the server and the client Class TestClient -> Client Class TestServer -> Server package tests; import java.io.Serializable; public class Hello implements Serializable { String hola = "hello my friend"; public String getHello () { return hola; } public void setHello (String str) { hola = str; } } package tests; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.net.Socket; import java.net.UnknownHostException; public class TestClient { public static void main(String[] args) { try { ObjectOutputStream clientOutput; ObjectInputStream serverInput; Hello goingout = new Hello (); Socket client = new Socket ("localhost", 5555); clientOutput = new ObjectOutputStream (client.getOutputStream()); serverInput = new ObjectInputStream (client.getInputStream()); clientOutput.writeObject(goingout); clientOutput.flush(); Hello comingin = (Hello) serverInput.readObject(); System.out.println ("first time received: " + comingin.getHello()); /* * Socket client = new Socket ("localhost", 5555); clientOutput = new ObjectOutputStream (client.getOutputStream()); serverInput = new ObjectInputStream (client.getInputStream()); */ /* * Second request doesn't got through the server */ comingin.setHello("again"); clientOutput.writeObject(goingout); clientOutput.flush(); comingin = (Hello) serverInput.readObject(); System.out.println ("second time received: " + comingin.getHello()); } catch (ClassNotFoundException ex) { System.out.println (ex.getMessage()); } catch (UnknownHostException ex) { System.out.println (ex.getMessage()); } catch (IOException ex) { System.out.println (ex.getMessage()); } } } public class TestServer { public static void main(String[] args) { try { ServerSocket server = new ServerSocket(5555, 100); ObjectInputStream clientInput; ObjectOutputStream serverOutput; for (;;) { System.out.println ("Listening for connections"); Socket fromClient = server.accept(); serverOutput = new ObjectOutputStream (fromClient.getOutputStream()); clientInput = new ObjectInputStream (fromClient.getInputStream()); Hello received = (Hello) clientInput.readObject(); serverOutput.writeObject(received); serverOutput.flush(); } } catch (ClassNotFoundException ex) { Logger.getLogger(TestServer.class.getName()).log(Level.SEVERE, null, ex); } catch (IOException ex) { Logger.getLogger(TestServer.class.getName()).log(Level.SEVERE, null, ex); } } } </code></pre>

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