Java Socket长连接如何实现。

长连接，只要你不关闭服务端，就不会关闭，不管你有多少客户端都没有问题。

Java code

package lmd.echo.socket.server;

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

import org.apache.log4j.Logger;

/**
 * 
 * @author:牛车水
 * @mail:[e-mail]
 * @date:20090924
 * @info:java socket 服务端
 *
 */
public class SocketServer implements Runnable{

    private Socket client;
    private ServerSocket server;
    public SocketServer() {
        // TODO Auto-generated constructor stub
    }

    Logger logger = Logger.getLogger(SocketServer.class);
    
    public void run(){
        logger.info("java socket 开始执行……");
        try {
            server = new ServerSocket(8888);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        try{
            
            while(true){
                String firstValue = "";
                String returnStr = "";
                client = server.accept();
                BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
                PrintWriter out = new PrintWriter(client.getOutputStream());
                ExecuteSocketServer ess = new ExecuteSocketServer();
                String reciverInfo = in.readLine();//得到客户端传来的数据
                //your code
                out.println(returnStr);
                out.flush();    
                client.close();
            }
            
        } catch (IOException ex){
            ex.printStackTrace();
        } catch (Exception e){
            e.printStackTrace();
        } finally {
            
        }

    }
    public static void main(String[] args){
        Thread t = new Thread(new SocketServer());
        t.start();
        
    }

}
只要不断开就可以了！