Java網(wǎng)絡(luò)編程UDP協(xié)議發(fā)送接收數(shù)據(jù)

更新時間：2021年08月16日 15:44:26 作者：綠芽在山頂

這篇文章主要為大家詳細(xì)介紹了Java網(wǎng)絡(luò)編程UDP協(xié)議發(fā)送接收數(shù)據(jù)，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價值，感興趣的小伙伴們可以參考一下

本文實例為大家分享了Java網(wǎng)絡(luò)編程UDP協(xié)議發(fā)送接收數(shù)據(jù)的具體代碼，供大家參考，具體內(nèi)容如下

UDP協(xié)議發(fā)送數(shù)據(jù)步驟

A：創(chuàng)建發(fā)送端socket對象；

B：創(chuàng)建數(shù)據(jù)，并把數(shù)據(jù)打包；

C：調(diào)用socket對象的發(fā)送方法發(fā)送數(shù)據(jù)包；

D：釋放資源

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協(xié)議接收數(shù)據(jù)步驟

A：創(chuàng)建接收端socket對象；

B：創(chuàng)建一個數(shù)據(jù)包（接收容器）；

C：調(diào)用socket對象的接收方法接收數(shù)據(jù)；

D：解析數(shù)據(jù)，顯示到控制臺；

E：釋放資源

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
  //獲取對方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+"發(fā)送的數(shù)據(jù)是："+s);
  
  //E
  ds.close();
 }
}

先運行接收端代碼，再運行發(fā)送端代碼。

多次從鍵盤接收發(fā)送數(shù)據(jù)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();
  //數(shù)據(jù)來自鍵盤錄入
  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  String line = null;
  while((line = br.readLine()) != null){
   //當(dāng)輸入jieshu時，結(jié)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
   //獲取對方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+"發(fā)送的數(shù)據(jù)是："+s);
  }
  
  //E
  //ds.close();
 }
}

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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