Java Socket实战之一 单线程通信

转载：http://blog.csdn.net/kongxx/article/details/7259436

现在做Java直接使用Socket的情况是越来越少，因为有很多的选择可选，比如说可以用spring，其中就可以支持很多种远程连接的操作，另外jboss的remoting也是不错的选择，还有Apache的Mina等等，但是在有些时候一些特殊情况仍然逃脱不了直接写Socket的情况，比如公司内部一些莫名其妙的游戏规则。

废话不说了，下面就看看如果自己写Socket应该怎么做吧。

首先是写一个Server类，这个类用来监听10000端口，并从这个端口接收消息然后输出，当收到“bye”时退出。

package com.googlecode.garbagecan.test.socket.sample1;

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

public class MyServer {
    public static void main(String[] args) throws IOException {
        ServerSocket server = new ServerSocket(10000);
        Socket socket = server.accept();
        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        PrintWriter out = new PrintWriter(socket.getOutputStream());

        while (true) {
            String msg = in.readLine();
            System.out.println(msg);
            out.println("Server received " + msg);
            out.flush();
            if (msg.equals("bye")) {
                break;
            }
        }
        socket.close();
    }
}

package com.googlecode.garbagecan.test.socket.sample1;

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

public class MyServer {
	public static void main(String[] args) throws IOException {
		ServerSocket server = new ServerSocket(10000);
		Socket socket = server.accept();
		BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
		PrintWriter out = new PrintWriter(socket.getOutputStream());
		
		while (true) {
			String msg = in.readLine();
			System.out.println(msg);
			out.println("Server received " + msg);
			out.flush();
			if (msg.equals("bye")) {
				break;
			}
		}
		socket.close();
	}
}

然后是一个Client类，这个类连接上面启动的Server类，然后接收任何用户输入，当遇到回车时发送字符串到Server上，当输入“bye”是退出。

package com.googlecode.garbagecan.test.socket.sample1;

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

public class MyClient {
    public static void main(String[] args) throws Exception {
        Socket socket = new Socket("localhost", 10000);
        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        PrintWriter out = new PrintWriter(socket.getOutputStream());
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        while (true) {
            String msg = reader.readLine();
            out.println(msg);
            out.flush();
            if (msg.equals("bye")) {
                break;
            }
            System.out.println(in.readLine());
        }
        socket.close();
    }
}

package com.googlecode.garbagecan.test.socket.sample1;

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

public class MyClient {
	public static void main(String[] args) throws Exception {
		Socket socket = new Socket("localhost", 10000);
		BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
		PrintWriter out = new PrintWriter(socket.getOutputStream());
		BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

		while (true) {
			String msg = reader.readLine();
			out.println(msg);
			out.flush();
			if (msg.equals("bye")) {
				break;
			}
			System.out.println(in.readLine());
		}
		socket.close();
	}
}

最后，首先运行MyServer类，然后MyClient类，然后在MyClient的控制台输入任意字符，可以看到当输入bye是server和client都会退出。