android学习笔记18--------------UDP示例

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参考别人一幅原理图。

import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;public class UDPClient{private DatagramSocket client=null;private DatagramPacket packet=null;private InetAddress host=null;public static int portSend=8888;public static String name="192.168.142.199";public UDPClient(){try{host = InetAddress.getByName(name);client=new DatagramSocket();System.out.println("客户端准备就绪");} catch (Exception e){e.printStackTrace();} }public void UDPClientRun(byte[] buffer) throws IOException{host = InetAddress.getByName(name);packet=new DatagramPacket(buffer,buffer.length, host, portSend);client.send(packet);System.out.println("客户端发送消息");}public void UDPClientStop(){client.close();}}

import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;public class UDPService{private DatagramSocket server =null;private DatagramPacket dPacket=null;private byte[] buffer = new byte[640];public static int portServer=8888;public UDPService (){try{server  = new DatagramSocket(portServer);dPacket = new DatagramPacket(buffer, buffer.length);} catch (Exception e){e.printStackTrace();}    }public byte[] UDPServiceRun(){try{server.receive(dPacket);System.out.println("服务端接收到消息");} catch (IOException e){e.printStackTrace();System.out.println("服务端未收到消息");}return buffer;}public void UDPSeverStop(){server.close();}public String getClientName(){String name="";name=dPacket.getAddress().toString();return name;}}