一个小的网页爬虫程序 - 黑马程序员技术交流社区

package cn.com.netexe;
/*
自定义浏览器，显示网页信息
*/
import java.io.*;//导包
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
class MyGui
{
private Frame f;//定义为成员变量，方便调用
private Button but;
private TextField tf;
private TextArea ta;
private Dialog d;
private Label lab;
private Button okBut;
MyGui()//构造函数
{
init();
}
public void init()
{
f=new Frame("my window");//创建窗体，名为my window
f.setBounds(300,100,600,500);//左，上，长，宽
f.setLayout(new FlowLayout());//流式布局管理器
tf=new TextField(60);//文本框长度
but=new Button("转到");//创建按钮，名为转到
ta=new TextArea(25,70);
d=new Dialog(f,"提示信息—self",true);//在窗体中关联对话框
d.setBounds(400,200,240,150);
d.setLayout(new FlowLayout());
lab=new Label();//创建标签
okBut=new Button("确定");
d.add(lab);//添加组件到对话框
d.add(okBut);
f.add(tf);//添加组件到窗体
f.add(but);
f.add(ta);
myEvent();
f.setVisible(true);//窗体可见
}
private void myEvent()
{
okBut.addActionListener(new ActionListener()//动作监听器
{
public void actionPerformed(ActionEvent e)
{
d.setVisible(false);
}
});
d.addWindowListener(new WindowAdapter()//窗体监听器
{
public void windowClosing(WindowEvent e)
{
d.setVisible(false);
}
});
tf.addKeyListener(new KeyAdapter()//键盘监听器
{
public void keyPressed(KeyEvent e)
{
try
{
if(e.getKeyCode()==KeyEvent.VK_ENTER)
showDir();
}
catch (Exception ex)
{
}
}
});
but.addActionListener(new ActionListener()//动作监听器
{
public void actionPerformed(ActionEvent e)
{
try
{
showDir();
}
catch (Exception ee)
{
}
}
});
f.addWindowListener(new WindowAdapter()//窗体监听器
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
tf.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});
tf.addKeyListener(new KeyAdapter()
{
public void keyPressed(KeyEvent ek)
{
if(ek.getKeyCode()==KeyEvent.VK_ENTER)
{
try {
showDir();
} catch (Exception e) {
e.printStackTrace();
}
}
}
});
}
private void showDir()throws Exception
{
ta.setText("");//清空文本框内容
//获取输入路径
String urlPath=tf.getText();//http://192.168.1.254:8080/maweb/demo.html
URL url=new URL(urlPath);//封装地址对象
URLConnection conn=url.openConnection();//连接网页服务器，openConnection里面封装了socket服务
BufferedReader bufr = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String str = null;
//定义正则表达式
String regex = "\\w+@\\w+(\\.\\w+)+";
Pattern p = Pattern.compile(regex);
while((str=bufr.readLine())!=null)
{
Matcher m = p.matcher(str);
while(m.find())
{
System.out.println(m.group());
// ta.setText(m.group());
ta.append(m.group()+"\r\n");
}
}
}
public static void main(String[] args)
{
new MyGui();
}
}

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