使用JDK自带BIO编写一个Client-Server通信

一、BIO网络编程实战之编写BioServer服务端

BioServer

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

public class BioServer {

    private static final int PORT = 8080;

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

        ServerSocket server = null;
        try {
            server = new ServerSocket(PORT);
            System.out.println("the time server is start in port :"+PORT);

            Socket socket = null;

            while (true){
                socket  =  server.accept();
                new Thread(new TimeServerHandler(socket)).start();
            }

        }catch (Exception e){
            e.printStackTrace();

        }finally {
            if(server != null){
                System.out.println("the time server close");
                server.close();
            }
        }


    }
}

TimeServerHandler

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

public class TimeServerHandler implements  Runnable{

    private Socket socket;

    public  TimeServerHandler(Socket socket){
        this.socket = socket;
    }


    @Override
    public void run() {
        BufferedReader in = null;
        PrintWriter  out = null;

        try {
            in = new BufferedReader( new InputStreamReader(this.socket.getInputStream()));
            out = new PrintWriter(this.socket.getOutputStream(),true);

            String body = null;

            while (( body = in.readLine())!= null && body.length()!=0){
                System.out.println("the time server receive msg :"+body);
                out.println(new Date().toString());
            }

        } catch (Exception e){

            e.printStackTrace();

        } finally {
            if(in != null){
                try {
                    in.close();
                }catch (Exception e){
                    e.printStackTrace();
                }
            }

            if(out != null){
                try {
                    out.close();
                }catch (Exception e){
                    e.printStackTrace();
                }
            }
            if(this.socket != null){
                try{
                    this.socket.close();

                }catch (Exception e){
                    e.printStackTrace();
                }
            }

        }

    }

}

温馨提示

运行起来的效果如下图所示

安装telnet

下面的代码仅针对win下的操作，其他系统自行网上搜索哈[aru_31]

Dism /Online /Enable-Feature /FeatureName:TelnetClient

输入下面代码即可建立连接，效果如下图

 telnet localhost 8080

二、BIO网络编程实战之编写BioClient客服端

package com.example.test05.demo.bio;

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

public class BioClient {
    private static final int PORT = 8080;
    private static final String HOST = "127.0.0.1";

    public static void main(String[] args)throws IOException {
        Socket socket = null;
        BufferedReader in = null;
        PrintWriter  out = null;
        try {
            socket =  new Socket(HOST, PORT);
            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            out = new PrintWriter(socket.getOutputStream(), true);
            out.println("i am client");
            String resp = in.readLine();
            System.out.println("当前服务器时间是:"+resp);

        }catch (Exception e){
            e.printStackTrace();

        }finally {
            if (in != null) {
                try {
                    in.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            if (out != null) {
                try {
                    out.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            if (socket != null) {
                try {
                    socket.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

温馨提示

一运行就会发送消息，通信结束之后就会返回给我们

三、BIO编写Client/Server通信优缺点分析

• 优点：
  • 模型简单
  • 编码简单
• 缺点
  • 性能瓶颈，请求数和线程数 N：N关系
  • 高并发情况下，CPU切换线程上下文损耗大