server.java

用java开发的一个简单的ftp

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

public class server
{
	public static void main(String [] args)
	{
		server frame = new server();
	}

	String strbuf = "";
	mt622_server t1;//线程子类

	public server()
	{
		t1 = new mt622_server();//启动线程
		t1.start();
	}

	//服务器线程类，负责接受信息
	class mt622_server extends Thread
	{
		public mt622_server(){};
		public void run()
		{
			String str1;
			try{
				DatagramSocket socket1 = new DatagramSocket(901);
				//建立UDP socket对象，使用端口号（901）
				System.out.println("server:"+InetAddress.getLocalHost().getHostName()+" locaport 901");
				while(true)
				{
					byte[] inbuffer = new byte[256];
					//建立设定packet1对象的接受信息变量(inbuffer),信息长度为(inbuffer.length)
					DatagramPacket packet1 = new DatagramPacket(inbuffer,inbuffer.length);
					//接收信息
					socket1.receive(packet1);
					str1 = new String(packet1.getData());
					str1 = str1.trim();
					if(str1.length()>0)
					{
						int port = packet1.getPort();
						System.out.println("<remote port>:"+port);
						System.out.println("<server port>已经接受信息:"+str1);
					}
				}
			}
			catch(IOException e){return;}
	    }
	}
}