java===UDP

import java.net.DatagramSocket;
import java.net.*;
import java.io.*;
public class Send implements Runnable{
     private DatagramSocket ds;
     public Send(DatagramSocket ds){
           this.ds=ds;
     }
   public void run(){
       try{ 
                   BufferedReader bfr = new BufferedReader(new InputStreamReader(System.in));
                 String text = null;
                 while((text=bfr.readLine())!=null){
                         byte[]buf = text.getBytes();
                         DatagramPacket dp = new DatagramPacket(buf,buf.length,InetAddress.getByName("192.168.1.255"),10001);
                         ds.send(dp);
                         if("88".equals(text)){
                                  break;
                         }
                        // ds.close();
                 }
           } catch(Exception e){
               
           }finally{
                ds.close();
           }
   }
}

import java.net.*;
import java.io.*;
public class Rece implements Runnable{
        private DatagramSocket ds;
        public Rece(DatagramSocket ds){
                this.ds=ds;
        }
      public void run(){
            while(true){
                 try{
                         byte[]buf = new byte[1024];
                      DatagramPacket dp = new DatagramPacket(buf,buf.length);
                      ds.receive(dp);
                      String ip = dp.getAddress().getHostAddress();
                      String text = new String(dp.getData(),0,dp.getLength());
                      System.out.println(ip+"
"+text);
                      if(text.equals("88")){
                           System.out.println(ip+"::退出聊天室");
                      }
                 }catch(Exception e){}
            }
      }
}

import java.io.IOException;
import java.net.DatagramSocket;
import java.net.SocketException;
public class Exe{
      public static void main(String[]args)throws IOException{
              DatagramSocket send = new DatagramSocket();
              DatagramSocket rece = new DatagramSocket(10001);
            Send s = new Send(send);
            Rece r = new Rece(rece);
            new Thread(s).start();
            new Thread(r).start();
      
      }
}

 UDP是比较常见的传输协议，通过网络流DatagramSocket完成传输，Datagrampacket作为数据包，以上面的聊天软件代码为例；虽然UDP传输安全性不高，但是速度快，适合于聊天软件，视频软件等开发使用；相对于TCP来说UDP不需要建立连接，提高了效率；最近比较忙于敲代码，所以博客更新较慢，后续会给大家带来TCP传输协议的使用；