java UDP实现一个聊天工具的示例代码

题目：
假设tom和jerry利用java udp进行聊天，请为他们编写程序。具体如下：
（1）、tom和jerry聊天的双方都应该具有发送端和接收端；
（2）、利用datagramsocket与datagrampacket；
（3）、实现 java.lang.runnable类，重写 run()方法。

学过计网的都知道，利用三元组（ip地址，协议，端口）就可以标识网络的进程了。
而进行通信我们直接运用socket就可以了，首先需要知道是socket是什么，这部分可以参考这个大佬写的博客。

实现一个客户端，那么需要tom和jerry都可以实现接收和发送功能，分别用两个线程启动。

接收线程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)
   {
    //接收数据包
    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()+" 说:"+s+"\t"+df.format(day));
    else{
    	system.out.println("jerry"+packet.getaddress()+" 说 :"+s+"\t"+df.format(day));
    }
    packet.setlength(buffer.length);
   }
  }
  catch(ioexception e)
  {
   system.out.println("ioexception");
  }
 }
}

发送线程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{
 //发送的socket端
 private datagramsocket sender = null;
 //待发送的目标地址
 private inetsocketaddress address = null;
 //从键盘输入
 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)
   {
    //输入待发送的内容
    string input = scan.nextline();
    if(input.equals("exit"))
     break;
    byte[] data = null;
    data = input.getbytes("utf-8");
    //创建udp数据报
    datagrampacket pack = new datagrampacket(data, data.length,address);
    sender.send(pack); 
   }
   system.out.println("exit!");
   
  }catch(ioexception e)
  {
   system.out.println("ioexception");
  }
 }

}

聊天服务器
chat_server.java

package chat_udp;
//杨丽冰 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;
   //创建待接受数据包的目的机的端口号和ip地址
   address = new inetsocketaddress(ip, dest_port);
   //创建发送的socket端
   datagramsocket sendsocket = new datagramsocket(send_port);
   //创建接受的socket端
   datagramsocket recesocket = new datagramsocket(rece_port);
   //发送线程建立
   send_thread = new send_thread(sendsocket, address);
   //接受线程的建立
   rece_thread = new receive_thread(recesocket);
   send_thread.start();
   rece_thread.start();
  }catch(exception e)
  {
   system.out.println("exception!");
  }

 }

}

聊天客户端 chat_client.java

package chat_udp;
//杨丽冰 201831064402
import java.net.datagramsocket;
import java.net.inetsocketaddress;

public class chat_client {
	//声明端口号
 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;
   //创建待接受数据包的目的机的端口号和ip地址
   address = new inetsocketaddress(ip, dest_port);
   //创建发送的socket端
   datagramsocket sendsocket = new datagramsocket(send_port);
   //创建接受的socket端
   datagramsocket recesocket = new datagramsocket(rece_port);
   //发送线程建立
   send_thread = new send_thread(sendsocket, address);
   //接受线程的建立
   rece_thread = new receive_thread(recesocket);
   send_thread.start();
   rece_thread.start();

  }catch(exception e)
  {
   system.out.println("exception!");
  }

 }

}

需要注意的时候运行的时候需要同时运行聊天服务器和客户端，才能够正常运行。
最终效果如下：

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