Java最简单的UDP实例

java

服务端: 监听端口（5051）,接收数据

import java.io.*;

import java.net.*;

import java.util.Scanner;

class UdpServer{

public static void main(String[] args)throws IOException{

DatagramSocket server = new DatagramSocket(5051);

byte[] recvBuf = new byte[100];

DatagramPacket recvPacket = new DatagramPacket(recvBuf, recvBuf.length);

while (true) {

server.receive(recvPacket);

String recvStr = new String(recvPacket.getData(), 0,

recvPacket.getLength());

System.out.println("收到:" + recvStr);

if(recvStr.endsWith("q")|| recvStr.endsWith("quit")){

break;

}

server.close();

}

客户端：向目标IP（127.0.0.1）及端口（5051），发送字符串

import java.io.*;

import java.net.*;

import java.util.Scanner;

class UdpClient{

public static void main(String[] args)throws IOException{

DatagramSocket client = new DatagramSocket();

InetAddress addr = InetAddress.getByName("127.0.0.1");

int port = 5051;

byte[] sendBuf;

while(true){

Scanner sc = new Scanner(System.in);

System.out.println("请输要发送的内容：");

String str = sc.nextLine();

sendBuf = str.getBytes();

DatagramPacket sendPacket = new DatagramPacket(sendBuf , sendBuf.length , addr , port );

client.send(sendPacket);

if(str.endsWith("q")|| str.endsWith("quit")){

break;

}

client.close();

}