JAVA udp 简单例子

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服务器端代码

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class UDPServer {
public static void main(String[] args)throws IOException{
DatagramSocket server = new DatagramSocket(8888);
byte[] recvBuf = new byte[100];
DatagramPacket recvPacket
= new DatagramPacket(recvBuf , recvBuf.length);
server.receive(recvPacket);
String recvStr = new String(recvPacket.getData() , 0 , recvPacket.getLength());
System.out.println("Hello World!" + recvStr);
int port = recvPacket.getPort();
InetAddress addr = recvPacket.getAddress();
String sendStr = "Hello ! I'm Server，I send you message";
byte[] sendBuf;
sendBuf = sendStr.getBytes();
DatagramPacket sendPacket
= new DatagramPacket(sendBuf , sendBuf.length , addr , port );
server.send(sendPacket);
server.close();
}
}

客户端代码

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class UDPClient {
public static void main(String[] args)throws IOException{
DatagramSocket client = new DatagramSocket();

String sendStr = "Hello! I'm Client";
byte[] sendBuf;
sendBuf = sendStr.getBytes();
InetAddress addr = InetAddress.getByName("127.0.0.1");
int port = 8888;
DatagramPacket sendPacket
= new DatagramPacket(sendBuf ,sendBuf.length , addr , port);
client.send(sendPacket);
byte[] recvBuf = new byte[100];
DatagramPacket recvPacket
= new DatagramPacket(recvBuf , recvBuf.length);
client.receive(recvPacket);
String recvStr = new String(recvPacket.getData() , 0 ,recvPacket.getLength());
System.out.println("收到:" + recvStr);
client.close();
}

}