UDP1

UDP1测试代码：

TestUDPServer.java

import java.net.*;
import java.io.*;

public class TestUDPServer
{
	public static void main(String args[]) throws Exception
	{
		byte buf[] = new byte[1024];
		DatagramPacket dp = new DatagramPacket(buf, buf.length);
		//UDP的5678端口
		DatagramSocket ds = new DatagramSocket(5678);
		while(true)
		{
			ds.receive(dp);
			//打印字符
			System.out.println(new String(buf,0,dp.getLength()));
			/*
			ByteArrayInputStream bais = new ByteArrayInputStream(buf);
			DataInputStream dis = new DataInputStream(bais);
			System.out.println(dis.readLong());
			*/
		}
	}
}

F:\java\socket>javac TestUDPServer.java

F:\java\socket>java TestUDPServer
Hello

TestUDPClient.java

import java.net.*;
import java.io.*;

public class TestUDPClient
{
	public static void main(String args[]) throws Exception
	{
		/*
		long n = 10000L;
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		DataOutputStream dos = new DataOutputStream(baos);
		dos.writeLong(n);
		
		byte[] buf = baos.toByteArray();
		ystem.out.println(buf.length);
		*/
		
		byte[] buf = (new String("Hello")).getBytes();
		DatagramPacket dp = new DatagramPacket(buf, buf.length, 
											   new InetSocketAddress("127.0.0.1", 5678)
											   );
		DatagramSocket ds = new DatagramSocket(9999);
		ds.send(dp);
		ds.close();
		
	}
}

f:\java\socket>javac TestUDPClient.java

f:\java\socket>java TestUDPClient

f:\java\socket>