dynashow.java

动态获取网站信息程序源码.功能还可以,希望站长能满意.

/**
 * Title:        Java网络编程演示
 * Description:  Java网络编程演示，用于北京师范大学计算机系Java课程教学示范。
 * Copyright:    Copyright (c) 2001
 * Company:      北京师范大学计算机系
 * @author 孙一林
 * @version 1.0
 */
import java.io.*;
import java.net.*;
import java.awt.*;
import java.applet.*;
public class dynashow extends java.applet.Applet
	implements Runnable {
	Thread dthread;
	URL fileur;
	TextArea showarea = new TextArea("Wait for a while...",00,100);
	public void init() {
		String url = " http://www.bnu.edu.cn/index.html";
		try {
			fileur = new URL(url);
		}
		catch ( MalformedURLException e) {
			System.out.println("Can't open the URL: " );
		}
		add(showarea);
	}
	public void start() {
		if (dthread == null) {
			dthread = new Thread(this);
			dthread.start();
		}
	}
	public void stop() {
		if (dthread != null) {
			dthread.stop();
			dthread = null;
		}
	}
	public void run() {
		InputStream filecon = null;
		DataInputStream filedata = null;
		String fileline;
		while(true) {
			try {
				filecon = fileur.openStream();
				filedata = new DataInputStream(filecon);
				while ((fileline = filedata.readLine()) != null) {
					showarea.setText(fileline+"\n");//.appendText(fileline+"\n");
				}
			}
			catch (IOException e) {
				System.out.println("Error in I/O:" + e.getMessage());
			}
			try {
				dthread.sleep(5000);
			}
			catch (InterruptedException e) { }
			repaint();
		}
	}
	public static void main(String[] args) {          // 定义Application程序入口
	    Frame f = new Frame("动态获取网络资源");              // 定义窗体
	    dynashow dynashow1 = new dynashow();
	    dynashow1.init();
	    dynashow1.start();                            // 启动程序
	    f.add("Center",dynashow1);                    // 显示在窗体内
	    f.setSize(480,300);
	    f.show();
	  }
}