先给出网页地址：
| https://wall.alphacoders.com/featured.php?lang=Chinese |
主要步骤：
1、利用Jsoup的connect方法获取Document对象
String html = "https://wall.alphacoders.com/featured.php?lang=Chinese"; Document doc = Jsoup.connect(html).get(); |
内容过长，就不再显示。
我们以这部分为例：
<ul class="nav nav-pills"> <li><a href="https://alphacoders.com/site/about-us" rel="nofollow">About Us</a></li> <li><a href="https://alphacoders.com/site/faq" rel="nofollow">FAQ</a></li> <li><a href="https://alphacoders.com/site/privacy" rel="nofollow">Privacy Policy</a></li> <li><a href="https://alphacoders.com/site/tos" rel="nofollow">Terms Of Service</a></li> <li><a href="https://alphacoders.com/site/acceptable_use" rel="nofollow">Acceptable Use</a></li> <li><a href="https://alphacoders.com/site/etiquette" rel="nofollow">Etiquette</a></li> <li><a href="https://alphacoders.com/site/advertising" rel="nofollow">Advertise With Us</a></li> <li><a id="change_consent">Change Consent</a></li> </ul> |
2、我们先找到所有的ul：
| Elements elements = doc.getElementsByTag("ul"); |
输出如下：
<ul class="nav navbar-nav center"> <li> <a title="Submit Wallpapers" href="https://alphacoders.com/site/submit-wallpaper"><i class="el el-circle-arrow-up"></i> 提交</a> </li> <li> <a href="https://alphacoders.com/contest"><i class="el el-gift"></i> 精美奖品</a> </li> </ul> <ul class="nav navbar-nav navbar-right center"> <li> <a href="language.php?lang=Chinese"> <img src="https://static.alphacoders.com/wa/Chinese-flag.png" alt="Chinese-flag"> 中文 </a> </li> <li> <a rel="nofollow" href="https://alphacoders.com/users/login"><i class="el el-user"></i> 登录</a> </li> <li> <a href="https://alphacoders.com/users/register"><i class="el el-edit"></i> 注册</a> </li> </ul> <ul class="pagination"> <li class="active"><a id="prev_page" href="#">< 上一页</a></li> <li class="active"><a>1</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=2">2</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=3">3</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=4">4</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=5">5</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=6">6</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=7">7</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=8">8</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=9">9</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=10">10</a></li> <li><a>...</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=319">319</a></li> <li><a id="next_page" href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=2">下一页 ></a></li> </ul> <ul class="pagination"> <li class="active"><a href="#">< 上一页</a></li> <li class="active"><a>1</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=2">2</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=3">3</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=4">4</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=5">5</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=6">6</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=7">7</a></li> <li><a>...</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=319">319</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=2">下一页 ></a></li> </ul> <ul class="pagination"> <li class="active"><a href="#"><< </a></li> <li class="active"><a href="#">< 上一页</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=2">下一页 ></a></li> <li><a title="末页 (319)" href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=319"> >></a></li> </ul> <ul class="pagination"> <li class="active"><a href="#">1</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=2">2</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=3">3</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=4">4</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=5">5</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=6">6</a></li> <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=7">7</a></li> </ul> <ul class="nav nav-pills"> <li><a href="https://alphacoders.com/site/about-us" rel="nofollow">About Us</a></li> <li><a href="https://alphacoders.com/site/faq" rel="nofollow">FAQ</a></li> <li><a href="https://alphacoders.com/site/privacy" rel="nofollow">Privacy Policy</a></li> <li><a href="https://alphacoders.com/site/tos" rel="nofollow">Terms Of Service</a></li> <li><a href="https://alphacoders.com/site/acceptable_use" rel="nofollow">Acceptable Use</a></li> <li><a href="https://alphacoders.com/site/etiquette" rel="nofollow">Etiquette</a></li> <li><a href="https://alphacoders.com/site/advertising" rel="nofollow">Advertise With Us</a></li> <li><a id="change_consent">Change Consent</a></li> </ul> |
3、可以发现class为"nav nav-pills"的只有一个，我们找到它：
Elements elements = doc.getElementsByTag("ul"); //System.out.println(elements); Element tempElement = null; for(Element element : elements) { if (element.className().equals("nav nav-pills")) { tempElement = element; //System.out.println(element.className()); break; } } |
4、循环遍历这个ul，输出其中每一个li里每一个a的href和rel属性：
Elements li = tempElement.getElementsByTag("li"); for(Element element : li) { Elements element2 = element.getElementsByTag("a"); for(Element element3 : element2) { String hrefString = element3.attr("href"); String relString = element3.attr("rel"); if(hrefString != "" && relString != "") { System.out.println("href=" + hrefString + " " + "rel=" + relString); } } } |
最终结果：
href=https://alphacoders.com/site/about-us rel=nofollow href=https://alphacoders.com/site/faq rel=nofollow href=https://alphacoders.com/site/privacy rel=nofollow href=https://alphacoders.com/site/tos rel=nofollow href=https://alphacoders.com/site/acceptable_use rel=nofollow href=https://alphacoders.com/site/etiquette rel=nofollow href=https://alphacoders.com/site/advertising rel=nofollow |
完整代码：
import org.jsoup.nodes.Document; import org.jsoup.nodes.Element; import org.jsoup.select.Elements; import java.io.IOException; import org.jsoup.Jsoup; /** * @ClassName: Jsoup_Test * @description: * @author: KI * @Date: 2020年8月17日 下午8:15:14 */ public class Jsoup_Test { public static void main(String[] args) throws IOException { // TODO 自动生成的方法存根 String html = "https://wall.alphacoders.com/featured.php?lang=Chinese"; Document doc = Jsoup.connect(html).get(); System.out.println(doc); Elements elements = doc.getElementsByTag("ul"); //System.out.println(elements); Element tempElement = null; for(Element element : elements) { if (element.className().equals("nav nav-pills")) { tempElement = element; //System.out.println(element.className()); break; } } System.out.println(tempElement); Elements li = tempElement.getElementsByTag("li"); for(Element element : li) { Elements element2 = element.getElementsByTag("a"); for(Element element3 : element2) { String hrefString = element3.attr("href"); String relString = element3.attr("rel"); if(hrefString != "" && relString != "") { System.out.println("href=" + hrefString + " " + "rel=" + relString); } } } } } |
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