UDP简单例子

来源：互联网发布：巴洛克的艺术风格知乎编辑：程序博客网时间：2024/06/05 22:42

最原始：

server

package com.udptest;import java.io.*;import java.net.*;/** * Created by jiajia on 2017/7/21/021. */public class UDPServer {    public static void main(String[] args) throws IOException {        DatagramSocket server = new DatagramSocket(8080);        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("客户端传来消息:" + recvStr);        int port = recvPacket.getPort();        InetAddress addr = recvPacket.getAddress();        String sendStr = "Hello ! I'm Server";        byte[] sendBuf;        sendBuf = sendStr.getBytes();        DatagramPacket sendPacket = new DatagramPacket(sendBuf, sendBuf.length,addr, port);        server.send(sendPacket);        server.close();    }}

client

package com.udptest;import java.io.*;import java.net.*;/** * Created by jiajia on 2017/7/21/021. */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("10.0.10.220");        int port = 8080;        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("服务端传来消息:" + recvStr);        client.close();    }}

使用netty之后的：

 public void initServer() {        try {            Bootstrap b = new Bootstrap();            EventLoopGroup group = new NioEventLoopGroup();            b.group(group)                    .channel(NioDatagramChannel.class)                    .option(ChannelOption.SO_BROADCAST, true)                    .handler(new UdpServerHandler());            b.option(ChannelOption.RCVBUF_ALLOCATOR, new FixedRecvByteBufAllocator(65535));            b.bind(searchPort);        } catch (Exception e) {            log.warn("sever 启动失败", e);        }    }    private static class UdpServerHandler extends SimpleChannelInboundHandler<DatagramPacket> {        @Override        protected void channelRead0(ChannelHandlerContext channelHandlerContext, DatagramPacket datagramPacket) throws Exception {            ByteBuf content = datagramPacket.copy().content();            //... ...            //处理数据        }    }

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