java udp socket长连接demo
时间: 2023-08-23 21:05:39 浏览: 56
请注意,UDP是无连接的传输协议,因此不能像TCP一样保持长连接。UDP套接字可以连续发送和接收数据包,但无法保证它们的顺序或到达的时间。
以下是一个使用Java UDP套接字进行数据传输的示例代码:
客户端:
```java
import java.net.*;
public class UDPClient {
public static void main(String args[]) throws Exception {
DatagramSocket clientSocket = new DatagramSocket();
InetAddress IPAddress = InetAddress.getByName("localhost");
byte[] sendData;
byte[] receiveData = new byte[1024];
String sentence = "Hello Server!";
sendData = sentence.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, 9876);
clientSocket.send(sendPacket);
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
clientSocket.receive(receivePacket);
String modifiedSentence = new String(receivePacket.getData());
System.out.println("FROM SERVER:" + modifiedSentence);
clientSocket.close();
}
}
```
服务器:
```java
import java.net.*;
public class UDPServer {
public static void main(String args[]) throws Exception {
DatagramSocket serverSocket = new DatagramSocket(9876);
byte[] receiveData = new byte[1024];
byte[] sendData;
while (true) {
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
serverSocket.receive(receivePacket);
String sentence = new String(receivePacket.getData());
InetAddress IPAddress = receivePacket.getAddress();
int port = receivePacket.getPort();
String capitalizedSentence = sentence.toUpperCase();
sendData = capitalizedSentence.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, port);
serverSocket.send(sendPacket);
}
}
}
```
这个示例演示了一次简单的UDP数据包发送和接收。您可以将其扩展为在多个数据包之间保持连接并以长连接形式运行。但请注意,UDP套接字不能保证传输的可靠性。
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