Echo 服务器练习

最新推荐文章于 2022-11-12 14:42:42 发布

zhc_24

最新推荐文章于 2022-11-12 14:42:42 发布

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分类专栏： java

本文链接：https://blog.youkuaiyun.com/zhc_24/article/details/83008700

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本文介绍了一种简单的Echo服务器实现，使用Java语言。该服务器可以监听特定端口，接收客户端消息并回显。此外，还介绍了如何通过多线程技术使服务器能够同时处理多个客户端连接，提高了服务器的并发能力。

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简单Echo服务器

package zhc.Net;

import java.io.*;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

/**
 * 简单的Echo服务器
 */
public class EchoServer {
    public static void main(String[] args) {
        try {
            ServerSocket s = new ServerSocket(8189);
            InetAddress localHostAddress = InetAddress.getLocalHost();
            System.out.println(localHostAddress);
            //accept 只执行一次这里只能服务一个用户
            Socket incoming  = s.accept();
            try {
                    InputStream inStream = incoming.getInputStream();
                    OutputStream outStream = incoming.getOutputStream();

                    Scanner in = new Scanner(inStream);
                    PrintWriter out = new PrintWriter(outStream, true);

                    out.println("Hello! Enter BYE to exit.");

                    boolean done = false;
                    //轮询直到用户输入 BYE 结束循环关闭套接字
                    while (!done && in.hasNextLine()) {
                        String line = in.nextLine();
                        out.println("Echo " + line);
                        if (line.trim().equals("BYE"))
                            done = true;
                    }
            }finally {
                incoming.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

多线程 Echo服务器

package zhc.Net;

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

/**
 * 同时服务多个客户端的Echo服务器
 */
public class EchoServer2 {
    public static void main(String[] args) {
        try {
            int i = 1;
            ServerSocket s = new ServerSocket(8189);
            while(true) {
                Socket incoming = s.accept();
                System.out.println("Spawning" + i);
                Runnable r = new ThreadEchoHandler(incoming);
                Thread t = new Thread(r);
                t.start();
                i++;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

package zhc.Net;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Scanner;

public class ThreadEchoHandler implements Runnable{
    public ThreadEchoHandler(Socket i) {
        incoming = i;
    }
    @Override
    public void run() {
        try {
            try {
                InputStream inStream = incoming.getInputStream();
                OutputStream outStream = incoming.getOutputStream();

                Scanner in = new Scanner(inStream);
                PrintWriter out = new PrintWriter(outStream, true);

                out.println("Hello! Enter BYE to exit.");

                boolean done = false;
                //轮询直到用户输入 BYE 结束循环关闭套接字
                while (!done && in.hasNextLine()) {
                    String line = in.nextLine();
                    out.println("Echo " + line);
                    if (line.trim().equals("BYE"))
                        done = true;
                }
            } finally {
                incoming.close();
            }
        }catch (IOException e) {
            e.printStackTrace();
        }
    }
    private Socket incoming;
}