Java Socket编程

<script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script> socket program example! In this program, I develop an socket server running at port 5000. Then I develop a Application client and a Applet Client program to connect to the server and receive a message.This is very simple but if import usage. We can alse transfer an serializable object in two application by the same method.If you want to know more let me know down load source 1. Server program source // Server.java

/** * This a Socket Server program * @version 1.0 1999/12/27 * @author Huang Jian-chang **/ import java.net.*; import java.io.*; public class Server { ServerSocket server; DataOutputStream output; Socket socket; public Server (){ try{ // create a server on port 5000 server=new ServerSocket(5000); // display interactive informaion System.out.println("Server created."); System.out.println("waiting for client to connect on..."); // waiting for client to connect on... socket = server.accept(); // client connected System.out.println("client connected./nShutdown!"); output = new DataOutputStream(socket.getOutputStream()); output.writeUTF("Welcome to Server.Bye!"); output.close(); server.close(); } catch(SocketException e){ System.out.println(e.toString()); e.printStackTrace(); System.exit(1); } catch(IOException e){ System.out.println(e.toString()); e.printStackTrace(); System.exit(1); } } public static void main(String args[]){ Server game=new Server(); } }

2. Application Client program source // Client.java

/** * This a Socket Client program * @version 1.0 1999/12/27 * @author Huang Jian-chang **/ import java.io.*; import java.net.*; public class Client { public static void main(String args[]) { try{ if (args.length != 1){ System.out.println("USAGE: java Client servername"); return; } String connectto= args[0]; Socket connection; // connect to server if(connectto.equals("localhost")){ connection=new Socket(InetAddress.getLocalHost(),5000); } else{ connection=new Socket(InetAddress.getByName(connectto),5000); } DataInputStream input=new DataInputStream(connection.getInputStream()); // read information from server String info; info = input.readUTF(); System.out.println(info); connection.close(); } catch(SecurityException e){ System.out.println("SecurityException when connecting Server!"); } catch(IOException e){ System.out.println("IOException when connecting Server!"); } } }

3. Applet Client program source // AppletClient.java

/** * This a Socket Applet Client program * @version 1.0 1999/12/27 * @author Huang Jian-chang **/ import java.applet.*; import java.awt.*; import java.io.*; import java.net.*; public class AppletClient extends Applet { String info=""; public void init(){ try{ String connectto = getCodeBase().getHost(); Socket connection; // connect to server if(connectto.equals("localhost")){ connection=new Socket(InetAddress.getLocalHost(),5000); } else{ connection=new Socket(InetAddress.getByName(connectto),5000); } DataInputStream input=new DataInputStream(connection.getInputStream()); // read information from server info = input.readUTF(); System.out.println(info); connection.close(); } catch(SecurityException e){ System.out.println("SecurityException when connecting Server!"); info = e.toString(); } catch(IOException e){ System.out.println("IOException when connecting Server!"); info = e.toString(); } } public void paint(Graphics g){ g.drawString(info,20,20); } }

Html File AppletClient.html :

<html> <head> <title>Untitled Document</title> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> </head> <body bgcolor="#FFFFFF"> <hr> <applet code=AppletClient.class width = 200 height = 200 > </applet> <hr> </body </html>

4 steps to run the application 1. javac Server.java 2. javac Client.java 3. java Server 4. java Client localhost(or the computername in which the server is running) ! do the step 3 and 4 in two diffrent computer or Dos Commnand