Java網絡編程UDP協議發送接收數據

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本文實例為大傢分享瞭Java網絡編程UDP協議發送接收數據的具體代碼，供大傢參考，具體內容如下

UDP協議發送數據步驟

A：創建發送端socket對象；

B：創建數據，並把數據打包；

C：調用socket對象的發送方法發送數據包；

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協議接收數據步驟

A：創建接收端socket對象；

B：創建一個數據包（接收容器）；

C：調用socket對象的接收方法接收數據；

D：解析數據，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+"發送的數據是："+s);
  
  //E
  ds.close();
 }
}

先運行接收端代碼，再運行發送端代碼。

多次從鍵盤接收發送數據版本

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();
  //數據來自鍵盤錄入
  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  String line = null;
  while((line = br.readLine()) != null){
   //當輸入jieshu時，結束
   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+"發送的數據是："+s);
  }
  
  //E
  //ds.close();
 }
}

以上就是本文的全部內容，希望對大傢的學習有所幫助，也希望大傢多多支持WalkonNet。

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