通过UDP多线程连麦，演唱小伴龙儿歌：圣诞快乐

Posted 2022-01-09 哪吒

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一、2021年终总结

1、CSDN第二季新星计划导师

2、哪吒社区发起人

努力的小伙伴都在打卡学习、有每日寂寞打卡、每日读书打卡、每日视频打卡等等等，你还不加入学习吗？
打卡100天，不成神便成魔。

3、加入哪吒社区，学习打卡，根本停不下来

二、如何学习Java

1、基础不牢，地动山摇

稳扎稳打，一步一个脚印，坚持在CSDN写博客，持续输出，完美日更。

2、Java基础教程系列

3、Java基础思维导图

4、我也想加入，通过UDP手写一个在线咨询，问问哪吒大佬吧。

三、UDP实现多线程在线咨询

1、发送端

package com.guor.ipidea;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketException;

public class TalkSend implements Runnable 
    DatagramSocket socket = null;
    BufferedReader reader = null;
    private int fromPort;
    private String toIP;
    private int toPort;

    public TalkSend(int fromPort, String toIP, int toPort) 
        this.fromPort = fromPort;
        this.toIP = toIP;
        this.toPort = toPort;

        try 
            socket = new DatagramSocket(fromPort);
            reader = new BufferedReader(new InputStreamReader(System.in));
         catch (SocketException e) 
            e.printStackTrace();
        
    

    @Override
    public void run() 
        while (true)
            String data = null;
            try 
                data = reader.readLine();
                byte[] datas = data.getBytes();
                DatagramPacket packet = new DatagramPacket(datas,0,datas.length,new InetSocketAddress(this.toIP,this.toPort));
                socket.send(packet);
                if(data.equals("bye"))
                    break;
                
             catch (IOException e) 
                e.printStackTrace();
            
        
        socket.close();

2、接收端

package com.guor.ipidea;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

public class TalkReceive implements Runnable
    DatagramSocket socket = null;
    private int port;
    private String msgFrom;

    public TalkReceive(int port, String msgFrom) 
        this.port = port;
        this.msgFrom = msgFrom;

        try 
            socket = new DatagramSocket(port);
         catch (SocketException e) 
            e.printStackTrace();
        
    

    @Override
    public void run() 
        while (true)
            try 
                //准备接收包裹
                byte[] container = new byte[1024];
                DatagramPacket packet = new DatagramPacket(container,0,container.length);
                //阻塞式接收包裹
                socket.receive(packet);
                //断开连接bye
                byte[] data = packet.getData();
                String receiveData = new String(data,0,data.length);
                System.out.println(msgFrom + ":" + receiveData);
                if(receiveData.equals("bye"))
                    break;
                
             catch (IOException e) 
                e.printStackTrace();
            
        
        socket.close();

3、ipidea

package com.guor.ipidea;

public class IpIdea 
    public static void main(String[] args) 
        new Thread(new TalkSend(7777,"localhost",9999)).start();
        new Thread(new TalkReceive(8888,"哪吒")).start();

4、哪吒

package com.guor.ipidea;

public class Nezha 
    public static void main(String[] args) 
        new Thread(new TalkSend(5555,"localhost",8888)).start();
        new Thread(new TalkReceive(9999,"ipidea")).start();

四、投之以桃报之以李

1、哪吒送你一首《小伴龙儿歌：圣诞快乐》

马上圣诞节了，小学生想听儿歌，无奈都是收费的。哪吒灵机一动，教你用用java.net.URL下载下来就能听了。

2、获取《小伴龙儿歌：圣诞快乐》地址

3、代码实例

package com.guor.test;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class MerryTest 
    public static void main(String[] args) throws IOException 
        URL url = new URL("https://vd2.bdstatic.com/mda-mm02j05avh9knriq/sc/cae_h264_nowatermark/1638341959033134772/mda-mm02j05avh9knriq.mp4?v_from_s=hkapp-haokan-hbe&amp;auth_key=1639838362-0-0-0ae86199711f5fcbe20fba556a907433&amp;bcevod_channel=searchbox_feed&amp;pd=1&amp;pt=3&amp;abtest=3000203_5&amp;klogid=0562178188");
        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
        InputStream inputStream = urlConnection.getInputStream();
        FileOutputStream fileOutputStream = new FileOutputStream("圣诞快乐.mp4");
        byte[] buffer = new byte[1024];
        int len;
        while ((len=inputStream.read(buffer))!=-1)
            fileOutputStream.write(buffer,0,len);
        
        fileOutputStream.close();
        inputStream.close();
        urlConnection.disconnect();