Java Socket编程 _java socket开发-优快云博客

本文链接：https://blog.youkuaiyun.com/java169/article/details/2471402

本文提供了一个简单的Java Socket编程实例，包括服务器端和客户端（应用客户端及Applet客户端）的实现，展示了如何通过Socket进行基本的消息传递。

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/**

 * 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