Java实现UDP多线程在线咨询

本文实例为大家分享了Java实现UDP多线程在线咨询，供大家参考，具体内容如下

1.发送的线程

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 ;   //发送线程 public class TalkSend implements Runnable { DatagramSocket socket = null ; BufferedReader reader = null ; private int formPort ; //自身端口 private String toIP ; //发送到的IP private int toPort ; //发送到的端口   public TalkSend ( int formPort , String toIP , int toPort ) { this . formPort = formPort ; this . toIP = toIP ; this . toPort = toPort ;   try { socket = new DatagramSocket ( formPort ); reader = new BufferedReader ( new InputStreamReader ( System . in )); //获取控制台输入 } catch ( SocketException e ) { e . printStackTrace (); } }   @Override public void run () { while ( true ) { try { String data = reader . readLine (); //获取到的数据 byte [] datas = data . getBytes (); //转换为需要的字节数组 //将数据打包成包 DatagramPacket packet = new DatagramPacket ( datas , 0 , datas . length , new InetSocketAddress ( this . toIP , this . toPort )); socket . send ( packet ); //发送包 //退出指令 if ( packet . equals ( "bye" )){ break ; } } catch ( IOException e ) { e . printStackTrace (); }   } socket . close (); } }

2.接收的线程

import java . io . IOException ; import java . net . DatagramPacket ; import java . net . DatagramSocket ; import java . net . SocketException ; //接收线程 public class TalkReceive implements Runnable {   DatagramSocket socket = null ; //与发送端的socket为同一个，实现通信 private int port ; private String msgFrom ; //标志信息来源   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 { byte [] container = new byte [ 1024 ]; DatagramPacket packet = new DatagramPacket ( container , 0 , container . length ); socket . receive ( packet ); //接收数据   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.模拟学生端

//模拟学生 public class TalkStudent { public static void main ( String [] args ) { new Thread ( new TalkSend ( 7777 , "localhost" , 9999 )). start (); new Thread ( new TalkReceive ( 8888 , "老师" )). start (); } }

4.模拟老师端

//模拟老师 public class TalkTeacher { public static void main ( String [] args ) { new Thread ( new TalkSend ( 5555 , "localhost" , 8888 )). start (); new Thread ( new TalkReceive ( 9999 , "学生" )). start (); } }

5.截图

学生端：

老师端：

6.总结

首先 创建一个发送线程，里面定义要发送到的IP地址和端口，再创建一个DatagramSocket来进行通信，创建一个BufferReader(new InputStreamReader(System.in))来获取控制台的输入的数据，将获取到的数据打包进行发送。 之后 创建一个接收线程，里面定义自身的端口即可，再创建一个和发送端一样的DatagramSocket来进行通信，接收数据进行打印输出即可。最后模拟学生端和老师端，创建这两个线程来进行通信。学生发送线程到的端口是老师的接收端口，老师发送的端口是学生的接收端口，这样才能互相通信。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。

原文链接：https://blog.csdn.net/weixin_49092628/article/details/115837912

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