网络编程 -金典echo案例

2019独角兽企业重金招聘Python工程师标准>>>

一、服务端

package com.server;

import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

/**
 * @Auther: chenzhou
 * @Date: 2019/2/25
 * @Description: 网络编程服务端
 * @version: 1.0
 */
public class Server{
    public static void main(String[] args) throws Exception {
        ServerSocket serverSocket = new ServerSocket(9999);//设置端口号
        System.out.println("等待客户端连接");
        Socket accept = serverSocket.accept();
        //首先接收客户端发来的消息，然后进行数据处理后发送回客户端
        Scanner scanner = new Scanner(accept.getInputStream());//得到客户端发送的数据

        PrintStream stream = new PrintStream(accept.getOutputStream());//向客户端发送数据
        Boolean flag = true;
        while (flag){
            if(scanner.hasNext()){
                String next = scanner.next().trim();
                if("bye".equals(next)){
                    stream.println("ByeBye!!!");
                    flag = false;
                }else{
                    stream.println("[Echo]"+next);
                }
            }
        }
        //关闭流
        stream.close();
        scanner.close();
        serverSocket.close();

    }
}

二、客户端

package com.client;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.Socket;
import java.util.Scanner;

/**
 * @Auther: chenzhou
 * @Date: 2019/2/25
 * @Description: 网络编程客户端
 * @version: 1.0
 */
public class Client {
    private static final BufferedReader BUFFERED_READER= new BufferedReader(new InputStreamReader(System.in));
    public static void main(String[] args) throws Exception{
        Socket socket = new Socket("localhost",9999);
        Scanner scanner = new Scanner(socket.getInputStream());//服务端发来的信息
        PrintStream stream = new PrintStream(socket.getOutputStream());//向服务端发送信息
        Boolean flag = true;
        while(flag){
            String input = getString("请输入要发送的内容");
            stream.println(input);
            if(scanner.hasNext()){
                String next = scanner.next();
                System.out.println(next);
            }
            if("bye".equalsIgnoreCase(input)){
                flag = false;
            }
        }
        stream.close();
        scanner.close();
        socket.close();


    }

    public static String getString(String Prompt) throws  Exception{
        System.out.println(Prompt);
        String s = BUFFERED_READER.readLine();
        return s;
    }
}

输出结果：

三、多线程实现服务端（多个客户端连接一个服务端）

package com.server;

import java.io.IOException;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

/**
 * @Auther: chenzhou
 * @Date: 2019/2/25
 * @Description: 多线程实现服务端，让每个线程去处理客户端的请求
 * @version: 1.0
 */
public  class ServerForMore implements  Runnable{
    Socket socket = null;
    Scanner scanner = null;
    PrintStream stream= null;
    Boolean flag = true;
    //构造器初始化参数
    public  ServerForMore(Socket client) throws Exception {
        this.socket = client;
        scanner = new Scanner(client.getInputStream());//得到客户端发送的数据
        stream = new PrintStream(client.getOutputStream());//向客户端发送消息
    }

    @Override
    public void run() {
        while (this.flag){
            if(this.scanner.hasNext()){
                String next = scanner.next().trim();
                if("bye".equals(next)){
                    stream.println("ByeBye!!!");
                    flag = false;
                }else{
                    stream.println("[Echo]"+next);
                }
            }
        }
        //关闭流
        stream.close();
        scanner.close();
        try {
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    public static void main(String[] args) throws Exception {
        ServerSocket serverSocket = new ServerSocket(9999);
        System.out.println("等待客户端连接。。。。");
        Boolean flag = true;
        while(flag){
            Socket client = serverSocket.accept();
            new Thread(new ServerForMore(client)).start();
        }
        serverSocket.close();
    }
}

 

转载于:https://my.oschina.net/chenzhou/blog/3014415