Jsoup解析网页、文件
Jsoup网站：http://jsoup.org/
所有的使用方法都可以从api获得，api地址：http://jsoup.org/apidocs/
html的结构，可以参考wiki：http://en.wikipedia.org/wiki/HTML_element
----------------------Jsoup连接---------------------
连接url：

import java.io.IOException;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;

public class JsoupTest {

	public static void main(String[] args) {
		Document doc = null;
		String url = " http://slashdot.org/";
		try {
			doc = Jsoup
					.connect(url)
					.header("User-Agent",
							"Mozilla/5.0 (Windows; U; Windows NT 5.2) Gecko/2008070208 Firefox/3.0.1")
					.header("Accept", "text ml,application/xhtml+xml").header(
							"Accept-Language", "zh-cn,zh;q=0.5").header(
							"Accept-Charset", "GB2312,utf-8;q=0.7,*;q=0.7")
					.get();
			Element body = doc.body();
			System.out.println(body.text());

		} catch (IOException e) {
			e.printStackTrace();
		}

	}
}

为了方便的话，可以直接使用：

doc = Jsoup.connect(url).get();

连接htm文件，将doc部分替换如下：

String baseUrl = "";
File input = new File(url);
Document doc = Jsoup.parse(input, "UTF-8", baseUrl);

----------------------Jsoup解析---------------------
解析部分使用的是Selector方法。
例如，将网页保存成.htm文件后，见附件，下面只显示该网页的一个片段：

<div id="bodycol"><div id="jobheadertop">&nbsp;</div><div id="jobheader"><img border="0" src="./102708474_files/pixel.gif" alt="DiSalvo LLC" id="companyLogo" class="logo" onerror="removeLogo()"><p id="companyNameHeader" style="display: block; ">DiSalvo LLC recruiting</p>
          <div id="subicons"><img src="./102708474_files/pixel(1).gif" height="1" width="1" alt="" style="margin:0px"></div><div style="clear:both;height:1px">&nbsp;</div><div id="jobheaderbottom">&nbsp;</div></div><div id="jobwrappertop2">&nbsp;</div><div id="jobwrapper">
          <div id="jobsummary">
            <div id="jobsummary_content">
              <h2>Job Summary</h2>
              <dl>
                <dt>Company</dt>
                <dd><span class="wrappable">DiSalvo LLC recruiting</span></dd>
                <dt>Location</dt>
                <dd><span class="wrappable">Tigard, OR 97223</span></dd>
                <dt>Industries</dt>
                <dd><span class="wrappable">All</span></dd>
                <dt>Job Type</dt>
                <dd class="multipledd"><span class="wrappable">Full Time</span></dd><dd class="multipleddlast"><span class="wrappable"> Employee</span></dd>
                <dt>Years of Experience</dt>
                <dd><span class="wrappable">2+? to 5 Years</span></dd>
                <dt>Career Level</dt>
                <dd><span class="wrappable">Experienced (Non-Manager)</span></dd>
                <dt>Salary</dt>
                <dd><span class="wrappable">$47,000.?00 - $49,000.?00  /?year<br>$7k per year expense acct, medical, dental, 401K, uncapped commissions</span></dd>
              </dl>
            </div>
          </div>
          <div id="jobcopy">
            <h1>Sales Representative</h1>
            <h2>About the Job</h2>
            <div id="jobBodyContent">

想提取出<div id="jobsummary">的片段，那么使用：

private String seletorJobSum = "div#jobsummary";
Elements elements = element.select(seletorJobSum);
if(elements.size() == 0){
	return null;
}
Element section = elements.first();

<