Java网络编程UDP协议发送接收数据

本文实例为大家分享了java网络编程udp协议发送接收数据的具体代码，供大家参考，具体内容如下

udp协议发送数据步骤

a：创建发送端socket对象；

b：创建数据，并把数据打包；

c：调用socket对象的发送方法发送数据包；

d：释放资源

package net;
 
import java.io.ioexception;
import java.net.datagrampacket;
import java.net.datagramsocket;
import java.net.inetaddress;
 
public class senddemo {
 public static void main(string[] args) throws ioexception {
  //a
  datagramsocket ds = new datagramsocket();
  
  //b
  byte[] by = "hello,udp".getbytes();
  int length = by.length;
  inetaddress addr = inetaddress.getbyname("192.168.1.22");
  int port = 10010;
  datagrampacket dp = new datagrampacket(by, length, addr, port);
  
  //c
  ds.send(dp);
  
  //d
  ds.close();
  
 }
}

udp协议接收数据步骤

a：创建接收端socket对象；

b：创建一个数据包（接收容器）；

c：调用socket对象的接收方法接收数据；

d：解析数据，显示到控制台；

e：释放资源

package net;
 
import java.io.ioexception;
import java.net.datagrampacket;
import java.net.datagramsocket;
import java.net.inetaddress;
 
public class receivedemo {
 public static void main(string[] args) throws ioexception {
  //a
  datagramsocket ds = new datagramsocket(10010);
  
  //b
  byte[] by = new byte[1024];
  int length = by.length;
  datagrampacket dp = new datagrampacket(by, length);
  
  //c
  ds.receive(dp);
  
  //d
  //获取对方ip
  inetaddress addr = dp.getaddress();
  string ip = addr.gethostaddress();
  byte[] by2 = dp.getdata();
  int len = by2.length;
  string s = new string(by2, 0, len);
  system.out.println(ip+"发送的数据是："+s);
  
  //e
  ds.close();
 }
}

先运行接收端代码，再运行发送端代码。

多次从键盘接收发送数据版本

package net;
 
import java.io.bufferedreader;
import java.io.ioexception;
import java.io.inputstreamreader;
import java.net.datagrampacket;
import java.net.datagramsocket;
import java.net.inetaddress;
 
public class senddemo {
 public static void main(string[] args) throws ioexception {
  //a
  datagramsocket ds = new datagramsocket();
  //数据来自键盘录入
  bufferedreader br = new bufferedreader(new inputstreamreader(system.in));
  string line = null;
  while((line = br.readline()) != null){
   //当输入jieshu时，结束
   if("jieshu".equals(line)){
    break;
   }
   //b
   byte[] by = line.getbytes();
   int length = by.length;
   inetaddress addr = inetaddress.getbyname("192.168.1.22");
   int port = 10010;
   datagrampacket dp = new datagrampacket(by, length, addr, port);
    
   //c
   ds.send(dp);
  }
  //d
  ds.close();
  
 }
}

package net;
 
import java.io.ioexception;
import java.net.datagrampacket;
import java.net.datagramsocket;
import java.net.inetaddress;
 
public class receivedemo {
 public static void main(string[] args) throws ioexception {
  //a
  datagramsocket ds = new datagramsocket(10010);
  //多次接受版本
  while(true){
   //b
   byte[] by = new byte[1024];
   int length = by.length;
   datagrampacket dp = new datagrampacket(by, length);
   
   //c
   ds.receive(dp);
   
   //d
   //获取对方ip
   inetaddress addr = dp.getaddress();
   string ip = addr.gethostaddress();
   byte[] by2 = dp.getdata();
   int len = by2.length;
   string s = new string(by2, 0, len);
   system.out.println(ip+"发送的数据是："+s);
  }
  
  //e
  //ds.close();
 }
}

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。