java读取（正则表达式分析）网页内容

http://www.busfly.cn/csdn/post/458.html

package com.xiaofeng.picup;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/** *//**
*
* @author 晓峰2007.1.18 抓取雅虎知识堂的文章标题及内容（测试） 手动输入网址抓取，可进一步自动抓取整个知识堂的全部内容
*
*/
public class WebContent ...{
    /** *//**
     * 读取一个网页全部内容
     */
    public String getOneHtml(String htmlurl) throws IOException...{
        URL url;
        String temp;
        StringBuffer sb = new StringBuffer();
        try ...{
            url = new URL(htmlurl);
            BufferedReader in = new BufferedReader(new InputStreamReader(url
                    .openStream(), "utf-8"));// 读取网页全部内容
            while ((temp = in.readLine()) != null) ...{
                sb.append(temp);
            }
            in.close();
        }catch(MalformedURLException me)...{
            System.out.println("你输入的URL格式有问题！请仔细输入");
            me.getMessage();
            throw me;
        }catch (IOException e) ...{
            e.printStackTrace();
            throw e;
        }
        return sb.toString();
    }

    /** *//**
     *
     * @param s
     * @return 获得网页标题
     */
    public String getTitle(String s) ...{
        String regex;
        String title = "";
        List<String> list = new ArrayList<String>();
        regex = "<title>.*?</title>";
        Pattern pa = Pattern.compile(regex, Pattern.CANON_EQ);
        Matcher ma = pa.matcher(s);
        while (ma.find()) ...{
            list.add(ma.group());
        }
        for (int i = 0; i < list.size(); i++) ...{
            title = title + list.get(i);
        }
        return outTag(title);
    }

    /** *//**
     *
     * @param s
     * @return 获得链接
     */
    public List<String> getLink(String s) ...{
        String regex;
        List<String> list = new ArrayList<String>();
        regex = "<a[^>]*href=("([^"]*)"|'([^']*)'|([^\s>]*))[^>]*>(.*?)</a>";
        Pattern pa = Pattern.compile(regex, Pattern.DOTALL);
        Matcher ma = pa.matcher(s);
        while (ma.find()) ...{
            list.add(ma.group());
        }
        return list;
    }

    /** *//**
     *
     * @param s
     * @return 获得脚本代码
     */
    public List<String> getScript(String s) ...{
        String regex;
        List<String> list = new ArrayList<String>();
        regex = "<script.*?</script>";
        Pattern pa = Pattern.compile(regex, Pattern.DOTALL);
        Matcher ma = pa.matcher(s);
        while (ma.find()) ...{
            list.add(ma.group());
        }
        return list;
    }

    /** *//**
     *
     * @param s
     * @return 获得CSS
     */
    public List<String> getCSS(String s) ...{
        String regex;
        List<String> list = new ArrayList<String>();
        regex = "<style.*?</style>";
        Pattern pa = Pattern.compile(regex, Pattern.DOTALL);
        Matcher ma = pa.matcher(s);
        while (ma.find()) ...{
            list.add(ma.group());
        }
        return list;
    }

    /** *//**
     *
     * @param s
     * @return 去掉标记
     */
    public String outTag(String s) ...{
        return s.replaceAll("<.*?>", "");
    }