java socket的小例子(服务端与客户端)

package com.test;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

//服务端

//这个程序是有很多地方需要debug的，这里只是个简单的例子，请谅解

public class ServerSocketTest extends Thread{
 private Socket socket = null;
 public static int index = 0;
 
 public ServerSocketTest(Socket socket){
  this.socket = socket;
 }
 
 public void run() {
  PrintWriter  out = null;
  BufferedReader in = null;
  BufferedReader line = null;
  
  try{
   System.out.println("=====服务端启动=====");
   out = new PrintWriter (socket.getOutputStream(),true);//获得输出流
   in = new BufferedReader(new InputStreamReader(socket.getInputStream()));//获得输入流
   while(true){
    System.out.println("=====第"+index+"个客户端连接进来成功！=====");
    
    while (true) {
     String str = in.readLine();//获得输入流数据
     System.out.println("第"+index+"个client=======:" + str);

     System.out.print("===== 服务端开始说话 ^-^ =====:");
     line = new BufferedReader(new InputStreamReader(System.in));
     String msg = line.readLine();

     if (msg.equals("exit")) {
      System.out.println("*****服务端退出*****");
      System.exit(0);
     } else {
      out.println(msg);
      out.flush();
     }
    }
   }
  }catch(Exception e){
   e.printStackTrace();
  }finally{
   try{
    if(line != null){
     line.close();
    }
    if(out != null){
     out.close();
    }
    if(in != null){
     in.close();
    }
    if(socket != null){
     socket.close();
    }
   }catch(Exception e){
    e.printStackTrace();
   }
  }
  
 }

 public static void main(String[] args){
  try{
   ServerSocket serverSocket = new ServerSocket(9999);
   while(true){
    ServerSocketTest test = new ServerSocketTest(serverSocket.accept());
    if(test != null){
     index++;
    }
    test.start();
   }
  }catch(Exception e){
   e.printStackTrace();
  }
 }
}

 

 

 

//客户端

package com.test;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

public class ClientSocketTest {
 public static void main(String[] args){
  Socket socket = null;
  PrintWriter  out = null;
  BufferedReader in = null;
  BufferedReader line = null;
  boolean bool = true;
  try{
   socket = new Socket("127.0.0.1",9999);//创建套接字将其连接到指定的主机的指定端口上
   out = new PrintWriter (socket.getOutputStream(),true);//获得输出流
   in = new BufferedReader(new InputStreamReader(socket.getInputStream()));//获得输入流
   System.out.println("=====客户端连接主机成功！=====");
   while(bool){ 
    System.out.print("===== 客户端开始说话 ^-^ =====:");
    line = new BufferedReader(new InputStreamReader(System.in));//获得控制台输入
    String msg = line.readLine();
    if(msg.equals("exit")){
     System.out.println("*****客户端退出*****");
     break;
    }else{
     out.println(msg);//将控制台输入的数据发送到服务器;
     out.flush();
    }
    
    String str = in.readLine();
    System.out.println("server-------:"+str);
    
   } 
  }catch(Exception e){
   e.printStackTrace();
  }finally{
   try{
    if(line != null){
     line.close();
    }
    if(out != null){
     out.close();
    }
    if(in != null){
     in.close();
    }
    if(socket != null){
     socket.close();
    }
   }catch(Exception e){
    e.printStackTrace();
   }
  }
 }
}