weather.java

采用java正则表达式对网站http://www.dlqx.gov.cn的天气预报进行抽取程序

import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import java.util.regex.*;

public class Weather extends Frame {
	    /**
	 * 
	 */
	private static final long serialVersionUID = -6280689436434350053L;
		private String result11="";
	    private String str="";
	    private String s="";
	    private String result1="";
	    private String result2="";
		private Label text=new Label("网址");
		private TextField address=new TextField("http://www.dlqx.gov.cn",20);
		private TextArea content1=new TextArea(12,12);
		private TextArea content2=new TextArea(12,12);
		private Button ok=new Button("确定");
		private Frame f=new Frame("Weather");
		private Panel p=new Panel();
		private URL url=null;
		public Weather() {
		f.setSize(400,400);
		p.add(text,"West");
		p.add(address,"Center");
		p.add(ok,"East");
		f.add(p,"North");
		f.add(content1,"Center");
		f.add(content2,"South");
		f.setVisible(true);
		
		ok.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{				
			s=address.getText().trim();
			//System.out.println(s);
				try{
			url=new URL(s);
			content1.setText(null);
			BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
			while((str=in.readLine())!=null) {content1.append(str);content1.append("\r"+"\n");}
			    		   in.close();
			    	}
			    catch(Exception ee) {ee.printStackTrace();}
			result1=content1.getText().trim();
			result11=result1.replaceAll("<br>","\r"+"\n");
			result11=result11.replaceAll("&nbsp;"," ");
			
			Pattern p;
			Matcher m;
			p=Pattern.compile("大连市气象台\\d{1,2}月\\d{1,2}日.*℃");
			m=p.matcher(content1.getText().trim());
			while(m.find())
			{
				result2=m.group();
				result2=result2.replaceAll("<br>","\r"+"\n");
				result2=result2.replaceAll("&nbsp;"," ");
			}
			
			//result2=result111.substring(22056,22161);
			content2.setText(result2);
				
			}				   
		});
		
		f.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				dispose();
				System.exit(0);
			}
		});
	}
	
	public static void main(String args[]) {
		new Weather();
	}
}