1、传统BIO编程示例及缺点分析(netty-学习笔记)

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缺点分析：

     BIO主要问题在于每当有一个新客户端请求接入，服务端都会创建一个新的线程，无法满足高性能、高并发场景。

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示例源码：

TimeServer.java:

package com.study.netty.server;

import com.study.netty.handler.TimeServerHandler;

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

/**
* Created by gongqi on 2017/7/9.
*/
public class TimeServer {

    public static void main(String[] args) throws IOException {
        Integer port = 8080;
        ServerSocket server = null;
        try {
            server = new ServerSocket(port);
            System.out.println("this server start at 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){
                server.close();
            }
        }
    }
}

TimeServerHandler.java:

package com.study.netty.handler;

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

/**
* Created by gongqi on 2017/7/9.
*/
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(socket.getInputStream()));
            out = new PrintWriter(socket.getOutputStream(), true);
            String currTime = null;
            String body = null;
            //
            SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd hh:mm:ss");
            while (true) {
                body = in.readLine();
                if (body == null) {
                    break;
                }
                //
                currTime = "QueryTime".equals(body) ? format.format(new Date()) : "BADY QUERY";
                out.println(currTime);
            }
        } catch (Exception e) {
            //e.printStackTrace();
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            if (out != null) {
                out.close();
            }

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

TimeClient.java:

package com.study.netty.client;

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

/**
* Created by gongqi on 2017/7/9.
*/
public class TimeClient {

    public static void main(String[] args) {
        Integer port = 8080;
        String ip="127.0.0.1";
        Socket socket = null;
        BufferedReader in = null;
        PrintWriter out = null;
        //
        try {
            socket=new Socket(ip,port);
            in=new BufferedReader(new InputStreamReader(socket.getInputStream()));
            out=new PrintWriter(socket.getOutputStream(),true);
            //
            out.println("QueryTime");
            String resp=in.readLine();
            System.out.println(resp);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}