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Java源码：Socket编程

本文出自:www.chinajavaworld.com 作者: jdeveloper (2002-01-02 08:10:00)

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>
<body>
<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

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