BIO的简单Demo

package jesse.test1;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;

public class DemoServer extends Thread{
    
    private ServerSocket serverSocket;
    
    public int getPort(){
        return serverSocket.getLocalPort();
    }
    
    public void run(){
        try {
            serverSocket = new ServerSocket(0);
            //使用多线程实现
            Executor executor = Executors.newFixedThreadPool(8);
            while(true){
                Socket socket = serverSocket.accept();
                RequestHandler requestHandler = new RequestHandler(socket);
                /*requestHandler.start();*/
                executor.execute(requestHandler);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
            if(serverSocket != null){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
    
    public static void main(String[] args) {
        DemoServer server = new DemoServer();
        server.start();
        try {
            Socket client = new Socket(InetAddress.getLocalHost(), server.getPort());
            BufferedReader bufferReader = new BufferedReader(new InputStreamReader(client.getInputStream()));
            System.out.println(bufferReader.readLine());
            
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
}
/**
 * 1、服务端ServerSocket，启动绑定端口
 * 2、调用accept，阻塞等待客户端连接
 * 3、客户端连接后，启动一个单独线程负责处理客户端请求
 * 
 * 也可以使用多线程来处理连接不是很多的情况
 */


class RequestHandler extends Thread{
    private Socket socket;

    public RequestHandler(Socket socket) {
        this.socket = socket;
    }
    
    @Override
    public void run(){
        try {
            PrintWriter out = new PrintWriter(socket.getOutputStream());
            out.println("Hello World");
            out.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
}