TCP服务器程序模型的学习(Socket连接进一步理解学习)

服务器如果需要同时跟多个客户端会话,服务器端就需要循环调用ServerSocket.accept()方法进行不断的监听处理;另外如果服务器端程序与每个客户端的会话过程不能互相影响的话,就需要启动多个线程分别处理每个请求 
下面给个例子(发送一行文本字符,服务器端返回倒序的文本): 
1.ReverseServer.java文件 

package cn.com;

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

public class ReverseServer {

    public static void main(String[] args) {

        try {
            ServerSocket ss = new ServerSocket(8001);

            boolean bRunning = true;

            while (bRunning) {
                Socket s = ss.accept();
                new Thread(new Servicer(s)).start();
            }
            ss.close();

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

    }
}

2.Servicer.java文件 

package cn.com;

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

public class Servicer implements Runnable {
    Socket s;

    public Servicer(Socket s) {
        this.s = s;
    }

    @Override
    public void run() {
        // TODO Auto-generated method stub

        try {
            InputStream ips = s.getInputStream();
            OutputStream ops = s.getOutputStream();

            BufferedReader br = new BufferedReader(new InputStreamReader(ips));
                          //需要启动自动flush功能
            PrintWriter pw = new PrintWriter(ops,true);
            while (true) {
                String strLine = br.readLine();
                if (strLine.equalsIgnoreCase("quit")) {
                    break;
                }
                System.out.println("strLine =="+strLine);
                String strEcho = (new StringBuffer(strLine).reverse())
                        .toString();

                pw.println(strLine + "---->>>" + strEcho);


            }

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

    }

}

    当服务端运行起来后,我们就可以模拟客户端来测试: 

cmd---->telnet 127.0.0.1 8001---->输入一行字符,回车就会看到效果