Java UDP网络编程 - 最简单示例（一）
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文章
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2025-04-12 12:10:52
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import java.io.*;
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import java.net.*;
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class UDPServer{
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public static void main(String[] args)throws IOException{
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DatagramSocket server = new DatagramSocket(4545);
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byte[] recvBuf = new byte[100];
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DatagramPacket recvPacket
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= new DatagramPacket(recvBuf , recvBuf.length);
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server.receive(recvPacket);
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String recvStr = new String(recvPacket.getData() , 0 , recvPacket.getLength());
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System.out.println("来自客户端的数据：" + recvStr);
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int port = recvPacket.getPort();
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InetAddress addr = recvPacket.getAddress();
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String sendStr = "Hello ! I'm Server";
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byte[] sendBuf;
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sendBuf = sendStr.getBytes();
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DatagramPacket sendPacket
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= new DatagramPacket(sendBuf , sendBuf.length , addr , port );
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server.send(sendPacket);
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server.close();
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}
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}
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import java.io.*;
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import java.net.*;
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class UDPClient{
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public static void main(String[] args)throws IOException{
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DatagramSocket client = new DatagramSocket();
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String sendStr = "Hello! I'm Client";
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byte[] sendBuf;
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sendBuf = sendStr.getBytes();
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InetAddress addr = InetAddress.getByName("127.0.0.1");
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int port = 5050;
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DatagramPacket sendPacket
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= new DatagramPacket(sendBuf ,sendBuf.length , addr , port);
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client.send(sendPacket);
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byte[] recvBuf = new byte[100];
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DatagramPacket recvPacket
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= new DatagramPacket(recvBuf , recvBuf.length);
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client.receive(recvPacket);
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String recvStr = new String(recvPacket.getData() , 0 ,recvPacket.getLength());
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System.out.println("来自服务端的回复:" + recvStr);
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client.close();
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}
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}
