怎么抓取网页中的数据

怎么抓取网页中的数据，比如这个html中的<li>节点下的值？<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><script language="javascript">if (self!=top) window.top.location.replace(self.location);</script><meta http-equiv="Content-Type" content="text/html; charset=gbk" /><meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" /><title>夫妻笑话-中文幽默王</title><meta name="keywords" content="夫妻笑话" /><meta name="description" content="夫妻笑话-中文幽默王" /><script type="text/javascript" src="http://cbjs.baidu.com/js/s.js"></script><base href="http://www.haha365.com/" /><link href="favicon.ico" rel="shortcut icon" /><link type="text/css" rel="stylesheet" href="templates/2008/skins/default/index.css"/><link type="text/css" rel="stylesheet" href="templates/2008/skins/default/example.css"/></head><body><div id="head"><div class="head_content"><div class="logo"><a href="http://www.haha365.com/"><img 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解决方案 »

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使用URLConnection，具体用法参考api文档。它可以像你用FileInputStream读取本地文件一样读取网络资源。比方说把某个网址传递给他，可以得到这个网页源文件的字节流。就像对待一个txt文档一样操作它就可以。
方法有很多种,可以通过抓取网页的软件,也可以通过浏览器的插件,比如firefox的插件firebug就可以抓取
每个li前面都有div，我通常的做法是：先查找div，找到后在查找li，找到后就可以进行substring()操作了~
不知道你想干嘛，估计是想做个类似爬虫的东西，建议用jsoup 用法非常类似jQuery
http://www.oschina.net/question/12_14127参考这个地址，比htmlParser方便多了
我也觉得可以用类似jsoup这种的第三方包
一个获取贴吧第一页帖子列表的例子public static List<Map<String, String>> getList() throws Exception {
List<Map<String, String>> forumList = new ArrayList<Map<String, String>>();
String listHtml = HttpUtils.get("http://tieba.baidu.com/f?kw=XXXXXXXXX&fr=itb_favo&fp=favo");
listHtml = regsubstr("<table.*?id=\\\"thread_list_table\\\".*?>(.*?)</table>", listHtml, 0);
Object[] arr = regarray("<tr.*?>.*?</tr>", listHtml, 0);
for(int i = 0, l = arr.length; i < l; i++) {
String li = (String)arr[i];
if(li.indexOf("<td") < 0)continue;
Object[] line = regarray("<td.*?>(.*?)</td>", li, 1);
Map<String, String> lineMap = new HashMap<String, String>();
lineMap.put("VIEW_NUM", ((String)line[0]).trim());
lineMap.put("REPLY_NUM", ((String)line[1]).trim());
String addr = ((String)line[2]).trim();
String title = regsubstr("<a.*?>(.*?)</a>", addr, 1);
String type = regsubstr("<span.*?>(.*?)</span>", addr, 1);
addr = regsubstr("href=\\\"(.*?)\\\"", addr, 1);
lineMap.put("TYPE", type);
lineMap.put("TITLE", title);
lineMap.put("ADDR", addr);
lineMap.put("CREATED_BY", ((String)line[3]).trim());
String last = ((String)line[4]).trim();
String lastTime = regsubstr("^.*? ", last, 0);
lineMap.put("LAST_TIME", lastTime);
String lastReplyBy = regsubstr(" <a.*?>(.*?)</a>", last, 1);
lineMap.put("LAST_BY", lastReplyBy);
Date pubDate = convertToDate(lastTime);
timeList.add(pubDate);
forumList.add(lineMap);
}
return forumList;
}