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java UDP實(shí)現(xiàn)一個(gè)聊天工具的示例代碼

更新時(shí)間：2021年01月18日 09:39:36 作者：中二病沒有蛀牙

這篇文章主要介紹了java UDP實(shí)現(xiàn)一個(gè)聊天工具的示例代碼,本文給大家介紹的非常詳細(xì)，對大家的學(xué)習(xí)或工作具有一定的參考借鑒價(jià)值，需要的朋友可以參考下

題目：
假設(shè)Tom和Jerry利用Java UDP進(jìn)行聊天，請為他們編寫程序。具體如下：
（1）、Tom和Jerry聊天的雙方都應(yīng)該具有發(fā)送端和接收端；
（2）、利用DatagramSocket與DatagramPacket；
（3）、實(shí)現(xiàn) java.lang.Runnable類，重寫 run()方法。

在這里插入圖片描述

學(xué)過計(jì)網(wǎng)的都知道，利用三元組（ip地址，協(xié)議，端口）就可以標(biāo)識網(wǎng)絡(luò)的進(jìn)程了。
而進(jìn)行通信我們直接運(yùn)用socket就可以了，首先需要知道是socket是什么，這部分可以參考這個(gè)大佬寫的博客。
http://www.dbjr.com.cn/article/121601.htm
實(shí)現(xiàn)一個(gè)客戶端，那么需要Tom和Jerry都可以實(shí)現(xiàn)接收和發(fā)送功能，分別用兩個(gè)線程啟動。

接收線程Receive_Thread.java

package Chat_UDP;

import java.io.IOException;
import java.util.Date;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.text.SimpleDateFormat;

public class Receive_Thread extends Thread {
 private static final int MAX_RECEIVE_BUFFER = 1024;
 private DatagramSocket server;
 private DatagramPacket packet;
 byte[] buffer = new byte[MAX_RECEIVE_BUFFER];
 
 public Receive_Thread(DatagramSocket server)
 {
  this.server = server;
  packet = new DatagramPacket(buffer, buffer.length);
 }
 
 @Override
 public void run() {
  try
  {
   while(true)
   {
    //接收數(shù)據(jù)包
    server.receive(packet);
    String s = new String(packet.getData(),packet.getOffset(),packet.getLength(),"UTF-8");
    Date day=new Date(); 
    SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 
    if(packet.getPort() == 10001)
    	System.out.println("Tom"+packet.getAddress()+" 說:"+s+"\t"+df.format(day));
    else{
    	System.out.println("Jerry"+packet.getAddress()+" 說 :"+s+"\t"+df.format(day));
    }
    packet.setLength(buffer.length);
   }
  }
  catch(IOException e)
  {
   System.out.println("IOException");
  }
 }
}

發(fā)送線程Send_Thread.java

package Chat_UDP;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.util.Scanner;

public class Send_Thread extends Thread{
 //發(fā)送的socket端
 private DatagramSocket sender = null;
 //待發(fā)送的目標(biāo)地址
 private InetSocketAddress address = null;
 //從鍵盤輸入
 Scanner scan = new Scanner(System.in);
 public Send_Thread(DatagramSocket sender,InetSocketAddress address)
 {
  this.sender = sender;
  this.address = address;
 }
 
 @Override
 public void run() {
  // TODO Auto-generated method stub
  try
  {
   while(true)
   {
    //輸入待發(fā)送的內(nèi)容
    String input = scan.nextLine();
    if(input.equals("exit"))
     break;
    byte[] data = null;
    data = input.getBytes("UTF-8");
    //創(chuàng)建UDP數(shù)據(jù)報(bào)
    DatagramPacket pack = new DatagramPacket(data, data.length,address);
    sender.send(pack); 
   }
   System.out.println("Exit!");
   
  }catch(IOException e)
  {
   System.out.println("IOException");
  }
 }

}

聊天服務(wù)器
Chat_Server.java

package Chat_UDP;
//楊麗冰 201831064402
import java.net.DatagramSocket;
import java.net.InetSocketAddress;

public class Chat_Server {

 private static final int DEST_PORT = 8888;
 private static final int SEND_PORT = 10001;
 private static final int RECE_PORT = 9000;
 private static final String IP = "127.0.0.1";

 public static void main(String[] args)
 {
  try{
   Send_Thread send_thread = null;
   Receive_Thread rece_thread = null;
   InetSocketAddress address = null;
   //創(chuàng)建待接受數(shù)據(jù)包的目的機(jī)的端口號和IP地址
   address = new InetSocketAddress(IP, DEST_PORT);
   //創(chuàng)建發(fā)送的Socket端
   DatagramSocket sendsocket = new DatagramSocket(SEND_PORT);
   //創(chuàng)建接受的Socket端
   DatagramSocket recesocket = new DatagramSocket(RECE_PORT);
   //發(fā)送線程建立
   send_thread = new Send_Thread(sendsocket, address);
   //接受線程的建立
   rece_thread = new Receive_Thread(recesocket);
   send_thread.start();
   rece_thread.start();
  }catch(Exception e)
  {
   System.out.println("Exception!");
  }

 }

}

聊天客戶端 Chat_Client.java

package Chat_UDP;
//楊麗冰 201831064402
import java.net.DatagramSocket;
import java.net.InetSocketAddress;

public class Chat_Client {
	//聲明端口號
 private static final int DEST_PORT = 9000;
 private static final int SEND_PORT = 10000;
 private static final int RECE_PORT = 8888;
 private static final String IP = "127.0.0.1";

 public static void main(String[] args)
 {
  try{
   Send_Thread send_thread = null;
   Receive_Thread rece_thread = null;
   InetSocketAddress address = null;
   //創(chuàng)建待接受數(shù)據(jù)包的目的機(jī)的端口號和IP地址
   address = new InetSocketAddress(IP, DEST_PORT);
   //創(chuàng)建發(fā)送的Socket端
   DatagramSocket sendsocket = new DatagramSocket(SEND_PORT);
   //創(chuàng)建接受的Socket端
   DatagramSocket recesocket = new DatagramSocket(RECE_PORT);
   //發(fā)送線程建立
   send_thread = new Send_Thread(sendsocket, address);
   //接受線程的建立
   rece_thread = new Receive_Thread(recesocket);
   send_thread.start();
   rece_thread.start();

  }catch(Exception e)
  {
   System.out.println("Exception!");
  }

 }

}

需要注意的時(shí)候運(yùn)行的時(shí)候需要同時(shí)運(yùn)行聊天服務(wù)器和客戶端，才能夠正常運(yùn)行。
最終效果如下：

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