关于java socket长连接问题

求客户端和服务器源代码及解释

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先抢位,再写代码

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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:lk_echo@163.com
* @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