Socket 学习笔记(三)补充关于Socket双向输入输出的例子

前面几章的例子中服务端收到信息后都没有返回应答信息，在实际中也许会有用到，写个例子记住

[b]服务端代码[/b]

package com.mytest.socket;

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class SocketSevice {

	//侦听端口
	private  int port;

	private  ServerSocket serverSocket;

	//最大连接
	private static  int maxCount=3;

	//连接数量累计
	private  int index=0;

	private static  SocketSevice socketSevice=new SocketSevice(); 

	//任务线程池
	private  ExecutorService threadPool=Executors.newFixedThreadPool(maxCount);

	private SocketSevice(){}

	public static SocketSevice getInstance() 
	{

		return socketSevice;
	}

	public void listening(int port) throws IOException
	{
		this.port=port;
		serverSocket=new ServerSocket(port);

		//使用accept()阻塞等待客户请求，有客户请求到来则产生一个Socket对象，并继续执行
		while(true){	
		    Socket socket=serverSocket.accept();
		     SocketTask task=new SocketTask(socket,"任务"+index);
			 threadPool.execute(task);
			 index++;


		}


	}

	public void shutdown() throws IOException
	{
		if(threadPool.isTerminated()){
		  threadPool.shutdown();
		  serverSocket.close();
		}
	}

	public static void main(String[] args) 
	{
		SocketSevice s=SocketSevice.getInstance();

		try {
			s.listening(1099);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}


	}


	public int getPort() {
		return port;
	}

	public void setPort(int port) {
		this.port = port;
	}



}

package com.mytest.socket;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.Socket;

public class SocketTask implements Runnable{

	private Socket socket;
	private String name;

	public SocketTask(Socket socket,String name)
	{
		this.socket=socket;
		this.name=name;
		System.out.println("["+name+"]"+"开始.....");
	}

	@Override
	public void run() {

		BufferedReader br =null;
		BufferedWriter bw=null;
	try {

		 br=new BufferedReader(new InputStreamReader(socket.getInputStream()));  
         String  msg= br.readLine();  
         bw = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));  
         System.out.println("["+name+"]"+"接收数据>>"+msg);
         String str = "当前处理["+msg+"]";  
         bw.write(str);  
         bw.flush();  
         System.out.println("推送["+name+"]应答信息\n");
	} catch (IOException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}finally
	{
		try {
			if(br!=null)
			{
				br.close();
			}
			if(bw!=null)
			{
				bw.close();
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}




	}

}

[b]客户端的具体代码[/b]

package com.mytest.socket;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

public class SocketClient {

	private int remotePort;
	private String remoteIp;
	private Socket socket;

	public SocketClient(String remoteIp,int remotePort) throws IOException
	{
		this.remoteIp=remoteIp;
		this.remotePort=remotePort;
		socket=new Socket(remoteIp,remotePort);
		System.out.println("连接 : "+remoteIp+" : "+remotePort);

	}



    public void close() throws IOException
    {
    	socket.close();
    	System.out.println(" ----关闭连接 ----\n");
    }

	public void writeString(String str) throws IOException
	{
		//构建IO流  
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));  

		bw.write(str);

		//当接收的类使用的是BufferedReader，发送的类是BufferedWriter的时候，要注意发送的一行要有换行标识符才能正确写入

		bw.newLine();
		//刷新缓冲区才能真正写入
		bw.flush();
		System.out.println("传送数据: "+str);

        //读取服务器返回的消息数据  

		BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));  
	    String callbrk=br.readLine();
        System.out.println(socket.getInetAddress().getLocalHost()+":"+socket.getPort()+">>"+callbrk); 




	}



	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub

		try {
			for(int i=0;i<5;i++){
			SocketClient client=new SocketClient("127.0.0.1",1099);
			client.writeString("哈哈哈"+i);

			client.close();

			}

		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}


	}

}

先运行服务端（SocketSevice），再运行客户端(SocketClient) 效果如下


[img]http://dl2.iteye.com/upload/attachment/0117/0140/5bef0029-777c-3b1b-b1d3-63293340551b.png[/img]


[img]http://dl2.iteye.com/upload/attachment/0117/0142/f08b96b4-186e-3f15-b84a-2def76d73bda.png[/img]