UDP 本地转发 消息，实现松耦合的进程间通信

最近的项目需求，让多个Android应用共用一条链路，采用AIDL Service 觉得耦合度比较高，于是想想能不能用UDP本地转发的方式来将数据传送到那条链路所在的Service中。
于是写了下面两个测试代码。没有定义协议，直接用了对象序列化的方法。

服务器端代码：

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;


public class UDPServer extends Thread{
	private byte[] buffer = new byte[1024*4];
 	@Override
	public void run() {
		try {
			DatagramSocket mServerSocket = new DatagramSocket(8803);
			DatagramPacket mPacket = new DatagramPacket(buffer, buffer.length);
			while (true) {
				mServerSocket.receive(mPacket);
				System.out.println("接收到的长度：" + mPacket.getLength());
				System.out.println("端口地址：" + mPacket.getAddress().getHostAddress());
				byte[] data = mPacket.getData();
				ByteArrayInputStream in = new ByteArrayInputStream(data);
				ObjectInputStream obj_in = new ObjectInputStream(in);
				Message msg = (Message) obj_in.readObject();
				System.out.println(msg.toString());
			}
		} catch (SocketException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}
}

客户端代码：

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.UnsupportedEncodingException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.SocketException;
import java.util.Scanner;


public class UDPClient extends Thread{
	@Override
	public void run() {
		Scanner reader = new Scanner(System.in);
		SocketAddress address = new InetSocketAddress("127.0.0.1", 8803);
		
		while (true) {
			System.out.println("请输入Message的内容");
			String content = reader.next();
			try {
				ByteArrayOutputStream out = new ByteArrayOutputStream();
				ObjectOutputStream  obj_out = new ObjectOutputStream(out);
				Message msg = new Message(12, content);
				obj_out.writeObject(msg);
				byte[] data = out.toByteArray();
				DatagramPacket mPacket = new DatagramPacket(data, data.length,address);
				DatagramSocket mSocket = new DatagramSocket();
				mSocket.send(mPacket);
				mSocket.close();
			} catch (UnsupportedEncodingException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (SocketException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
			
		}
		
	}
}