java 网页抓取

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;   
  
  
public class WebContent   
{   
 /**  
  * 读取一个网页全部内容  
  */  
 public String getOneHtml(final String htmlurl) throws IOException   
 {   
  URL url;   
  String temp;   
  final StringBuffer sb = new StringBuffer();   
  try  
  {   
   url = new URL(htmlurl);   
   final 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 (final 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 (final IOException e)   
  {   
   e.printStackTrace();   
   throw e;   
  }   
  return sb.toString();   
 }   
  
 /**  
  *   
  * @param s  
  * @return 获得网页标题  
  */  
 public String getTitle(final String s)   
 {   
  String regex;   
  String title = "";   
  final List<String> list = new ArrayList<String>();   
  regex = "<title>.*?</title>";   
  final Pattern pa = Pattern.compile(regex, Pattern.CANON_EQ);   
  final 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(final String s)   
 {   
  String regex;   
  final List<String> list = new ArrayList<String>();   
  regex = "<a[^>]*href=(\"([^\"]*)\"|\'([^\']*)\'|([^\\s>]*))[^>]*>(.*?)</a>";   
  final Pattern pa = Pattern.compile(regex, Pattern.DOTALL);   
  final 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(final String s)   
 {   
  String regex;   
  final List<String> list = new ArrayList<String>();   
  regex = "<script.*?</script>";   
  final Pattern pa = Pattern.compile(regex, Pattern.DOTALL);   
  final Matcher ma = pa.matcher(s);   
  while (ma.find())   
  {   
   list.add(ma.group());   
  }   
  return list;   
 }   
  
 /**  
  *   
  * @param s  
  * @return 获得CSS  
  */  
 public List<String> getCSS(final String s)   
 {   
  String regex;   
  final List<String> list = new ArrayList<String>();   
  regex = "<style.*?</style>";   
  final Pattern pa = Pattern.compile(regex, Pattern.DOTALL);   
  final Matcher ma = pa.matcher(s);   
  while (ma.find())   
  {   
   list.add(ma.group());   
  }   
  return list;   
 }   
  
 /**  
  *   
  * @param s  
  * @return 去掉标记  
  */  
 public String outTag(final String s)   
 {   
  return s.replaceAll("<.*?>", "");   
 }   
  
 /**  
  *   
  * @param s  
  * @return 获取雅虎知识堂文章标题及内容  
  */  
 public HashMap<String, String> getFromYahoo(final String s)   
 {   
  final HashMap<String, String> hm = new HashMap<String, String>();   
  final StringBuffer sb = new StringBuffer();   
  String html = "";   
  System.out.println("\n------------------开始读取网页(" + s + ")--------------------");   
  try  
  {   
   html = getOneHtml(s);   
  }   
  catch (final Exception e)   
  {   
   e.getMessage();   
  }   
  // System.out.println(html);   
  System.out.println("------------------读取网页(" + s + ")结束--------------------\n");   
  System.out.println("------------------分析(" + s + ")结果如下--------------------\n");   
  String title = outTag(getTitle(html));   
  title = title.replaceAll("_雅虎知识堂", "");   
  // Pattern pa=Pattern.compile("<div   
  // class=\"original\">(.*?)((\r\n)*)(.*?)((\r\n)*)(.*?)</div>",Pattern.DOTALL);   
  final Pattern pa = Pattern.compile("<div class=\"original\">(.*?)</p></div>", Pattern.DOTALL);   
  final Matcher ma = pa.matcher(html);   
  while (ma.find())   
  {   
   sb.append(ma.group());   
  }   
  String temp = sb.toString();   
  temp = temp.replaceAll("(<br>)+?", "\n");// 转化换行   
  temp = temp.replaceAll("<p><em>.*?</em></p>", "");// 去图片注释   
  hm.put("title", title);   
  hm.put("original", outTag(temp));   
  return hm;   
  
 }   
  
 /**  
  *   
  * @param args  
  *            测试一组网页，针对雅虎知识堂  
  */  
 public static void main(final String args[])   
 {   
  String url = "";   
  final List<String> list = new ArrayList<String>();   
  System.out.print("输入URL，一行一个，输入结束后输入 go 程序开始运行:   \n");   
  /*  
   * http://ks.cn.yahoo.com/question/1307121201133.html  
   * http://ks.cn.yahoo.com/question/1307121101907.html  
   * http://ks.cn.yahoo.com/question/1307121101907_2.html  
   * http://ks.cn.yahoo.com/question/1307121101907_3.html  
   * http://ks.cn.yahoo.com/question/1307121101907_4.html  
   * http://ks.cn.yahoo.com/question/1307121101907_5.html  
   * http://ks.cn.yahoo.com/question/1307121101907_6.html  
   * http://ks.cn.yahoo.com/question/1307121101907_7.html  
   * http://ks.cn.yahoo.com/question/1307121101907_8.html  
   */  
  final BufferedReader br = new BufferedReader(new InputStreamReader(System.in));   
  try  
  {   
   while (!(url = br.readLine()).equals("go"))   
   {   
    list.add(url);   
   }   
  }   
  catch (final Exception e)   
  {   
   e.getMessage();   
  }   
  final WebContent wc = new WebContent();   
  HashMap<String, String> hm = new HashMap<String, String>();   
  for (int i = 0; i < list.size(); i++)   
  {   
   hm = wc.getFromYahoo(list.get(i));   
   System.out.println("标题： " + hm.get("title"));   
   System.out.println("内容： \n" + hm.get("original"));   
  }   
  /*  
   * String htmlurl[] = {  
   * "http://ks.cn.yahoo.com/question/1307121201133.html",  
   * "http://ks.cn.yahoo.com/question/1307121101907.html",  
   * "http://ks.cn.yahoo.com/question/1307121101907_2.html",  
   * "http://ks.cn.yahoo.com/question/1307121101907_3.html",  
   * "http://ks.cn.yahoo.com/question/1307121101907_4.html",  
   * "http://ks.cn.yahoo.com/question/1307121101907_5.html",  
   * "http://ks.cn.yahoo.com/question/1307121101907_6.html",  
   * "http://ks.cn.yahoo.com/question/1307121101907_7.html",  
   * "http://ks.cn.yahoo.com/question/1307121101907_8.html" }; WebContent  
   * wc = new WebContent(); HashMap<String, String> hm = new HashMap<String,  
   * String>(); for (int i = 0; i < htmlurl.length; i++) { hm =  
   * wc.getFromYahoo(htmlurl[i]); System.out.println("标题： " +  
   * hm.get("title")); System.out.println("内容： \n" + hm.get("original")); }  
   */  
  /*  
   * String html=""; String link=""; String sscript=""; String content="";  
   * System.out.println(htmlurl+" 开始读取网页内容：");  
   * html=wc.getOneHtml(htmlurl); System.out.println(htmlurl+"  
   * 读取完毕开始分析……"); html=html.replaceAll("(<script.*?)((\r\n)*)(.*?)((\r\n)*)(.*?)(</script>)","  
   * ");//去除脚本 html=html.replaceAll("(<style.*?)((\r\n)*)(.*?)((\r\n)*)(.*?)(</style>)","  
   * ");//去掉CSS html=html.replaceAll("<title>.*?</title>"," ");//除去页面标题  
   * html=html.replaceAll("<a[^>]*href=(\"([^\"]*)\"|\'([^\']*)\'|([^\\s>]*))[^>]*>(.*?)</a>","  
   * ");//去掉链接 html=html.replaceAll("(\\s){2,}?"," ");//除去多余空格  
   * html=wc.outTag(html);//多余标记 System.out.println(html);  
   */  
  
  /*  
   * String s[]=html.split(" +"); for(int i=0;i<s.length;i++){  
   * content=(content.length()>s[i].length())?content:s[i]; }  
   * System.out.println(content);  
   */  
  
  // System.out.println(htmlurl+"网页内容结束");   
  /*  
   * System.out.println(htmlurl+"网页脚本开始："); List  
   * script=wc.getScript(html); for(int i=0;i<script.size();i++){  
   * System.out.println(script.get(i)); }  
   * System.out.println(htmlurl+"网页脚本结束：");  
   *   
   * System.out.println(htmlurl+"CSS开始："); List css=wc.getCSS(html);  
   * for(int i=0;i<css.size();i++){ System.out.println(css.get(i)); }  
   * System.out.println(htmlurl+"CSS结束：");  
   *   
   * System.out.println(htmlurl+"全部链接内容开始："); List list=wc.getLink(html);  
   * for(int i=0;i<list.size();i++){ link=list.get(i).toString(); }  
   * System.out.println(htmlurl+"全部链接内容结束：");  
   *   
   * System.out.println("内容"); System.out.println(wc.outTag(html));  
   */  
 }   
}