java网络编程——socket实现简单的CS会话

还记得当年学计网课时用python实现一个简单的CS会话功能，这也是学习socket网络编程的第一步，现改用java重新实现，以此记录。

客户端

import java.io.*;

import java.net.Inet4Address;

import java.net.InetSocketAddress;

import java.net.Socket;

public class Client {

    public static void main(String[] args)throws IOException {

        Socket socket=new Socket();

//超时时间

        socket.setSoTimeout(3000);

        socket.connect(new InetSocketAddress(Inet4Address.getLocalHost(),2000),3000);

        System.out.println("已发起服务器连接");

        System.out.println("客户端信息："+socket.getLocalSocketAddress()+"P:"+socket.getLocalPort());

        System.out.println("服务器信息："+socket.getInetAddress()+"P:"+socket.getPort());

        try {

            todo(socket);

        }catch (Exception e){

            System.out.println("异常退出");

        }

    }

    private static void todo(Socket client)throws IOException{

        //构建键盘输入流

        InputStream in=System.in;

        BufferedReader input=new BufferedReader(new InputStreamReader(in));

        //得到socket输出流并转化为打印流

        OutputStream outputStream = client.getOutputStream();

        PrintStream socketPrintStream = new PrintStream(outputStream);

        //得到socket输入流并转化为BufferedReader

        InputStream inputStream = client.getInputStream();

        BufferedReader socketBufferedReader = new BufferedReader(new InputStreamReader(inputStream));

        Boolean flag = true;

        do {

            //键盘读取一行

            String str = input.readLine();

            //发送到服务器

            socketPrintStream.println(str);

            //从服务器读取一行

            String echo = socketBufferedReader.readLine();

            if("bye".equalsIgnoreCase(echo)){//equalsIgnoreCase是忽略大小写的比较

                flag = false;

            }else{

                System.out.println(echo);

            }

        }while(flag);

        //资源释放

        socketBufferedReader.close();

        socketPrintStream.close();

    }

}

服务器端

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintStream;

import java.net.ServerSocket;

import java.net.Socket;

public class Server {

    public static void main(String[] args)throws IOException{

        ServerSocket server = new ServerSocket(2000);

        System.out.println("服务器准备就绪");

        System.out.println("服务器信息："+server.getLocalSocketAddress()+"P:"+server.getLocalPort());

        //等待客户端连接

        for (;;){

            Socket client = server.accept();//拿到客户端

            ClientHandle clientHandle = new ClientHandle(client);//客户端加入到一个异步线程

            clientHandle.start();//启动线程

        }

    }

    /**

    客户端消息处理

     */

    private static class ClientHandle extends Thread{

        private Socket socket;

        private Boolean flag = true;

        ClientHandle(Socket socket){

            this.socket=socket;

        }

        @Override

        public void run(){

            super.run();

            System.out.println("客户端连接："+socket.getInetAddress()+"P:"+socket.getPort());

            try {

                //得到打印流，用于数据输出；服务器回送数据使用

                PrintStream socketOutput = new PrintStream(socket.getOutputStream());

                //得到输入流，用于接收数据

                BufferedReader socketInput = new BufferedReader(new InputStreamReader(socket.getInputStream()));

                do{

                    //客户端拿到一条数据

                    String str = socketInput.readLine();

                    if("bye".equalsIgnoreCase(str)){

                        flag = false;

                        socketOutput.println("bye");

                    }else{

                        System.out.println(str);

                        socketOutput.println("回送："+str.length());

                    }

                }while (flag);

            }catch (Exception e){

                System.out.println("异常断开");

            }finally {

                try {

                    socket.close();

                }catch (IOException e){

                    e.printStackTrace();

                }

            }

            System.out.println("客户端已退出："+socket.getInetAddress()+"P:"+socket.getPort());

        }

    }

}

巴特西

java网络编程——socket实现简单的CS会话

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