Jsoup入门

1、什么是Jsoup？

jsoup 是一款Java 的HTML解析器，可直接解析某个URL地址、HTML文本内容。它提供了一套非常省力的API，可通过DOM，CSS以及类似于jQuery的操作方法来取出和操作数据。

2、pox.xml

    <!-- 添加httpclient支持 -->  <dependency>    <groupId>org.apache.httpcomponents</groupId>    <artifactId>httpclient</artifactId>    <version>4.5.2</version></dependency><!-- 添加Jsoup支持 --><dependency>    <groupId>org.jsoup</groupId>    <artifactId>jsoup</artifactId>    <version>1.10.3</version></dependency>

3、相关代码

package com.rye;import java.util.Iterator;import org.apache.http.HttpEntity;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.util.EntityUtils;import org.jsoup.Jsoup;import org.jsoup.nodes.Document;import org.jsoup.nodes.Element;import org.jsoup.select.Elements;public class Demo4 {public static void main(String[] args) throws Exception{CloseableHttpClient httpclient = HttpClients.createDefault(); // 创建httpclient实例        HttpGet httpget = new HttpGet("http://www.cnblogs.com/"); // 创建httpget实例,访问博客园                 CloseableHttpResponse response = httpclient.execute(httpget); // 执行get请求        HttpEntity entity=response.getEntity(); // 获取返回实体        String content=EntityUtils.toString(entity, "utf-8");//网页内容        response.close(); // 关闭流和释放系统资源                Document doc = Jsoup.parse(content);//Jsoup解析网页内容为文档        Elements els = doc.getElementsByTag("title");//通过标签获取内容集合        Element e = els.get(0);//获取第一个元素        String text = e.text();//返回元素文本        String html = e.html();//返回元素html        System.out.println("text:"+text);        System.out.println("html:"+html);        System.out.println("========================");                Element e2 = doc.getElementById("site_nav_top");//获取指定Id的元素        String text2 = e2.text();//获取文本        System.out.println(text2);        System.out.println("========================");                Elements els3 = doc.getElementsByClass("titlelnk");//根据样式查询        Iterator it3 = els3.iterator();        while(it3.hasNext()) {        Element el3 = (Element) it3.next();        String text3 = el3.text();        System.out.println(text3);        }        System.out.println("========================");                Elements els4 = doc.getElementsByAttributeValue("width","48");        for(Element e4:els4) {        System.out.println(e4.toString());        }        System.out.println("========================");                //选择器查找        Elements els5 = doc.select(".post_item .post_item_body h3 a");        for(Element e5:els5) {        System.out.println("标题："+e5.text());        System.out.println("博客地址："+e5.attr("href"));//获取元素的属性的值        }        System.out.println("========================");                Elements els6 = doc.select("a[href]");//带有href的<a>元素        for(Element e6:els6) {        System.out.println("a[href]："+e6.toString());        }        System.out.println("========================");                Elements els7 = doc.select("img[src$=.png]");//查找img标签，具有src元素，并且以png结尾        for(Element e7:els7) {        System.out.println("img[src$=.png]："+e7.toString());        }        System.out.println("========================");                Element linkElement = doc.select("#friend_link").first();//获取集合的第一个元素        System.out.println("纯文本："+linkElement.text());//只要文字去掉里头的HTML所有元素        System.out.println("HTML:"+linkElement.html());//获取元素下所有的子元素}}

运行结果：

text:博客园 - 开发者的网上家园html:博客园 - 开发者的网上家园========================代码改变世界========================创建 overlay 网络 - 每天5分钟玩转 Docker 容器技术（50）Javascript跨域后台设置拦截Jenkins发布MVC应用程序一步一步学习Vue（十一）关于“工业互联网平台”建设，俺有本要奏hexo博客MathJax公式渲染问题使用 Router 实现的模块化，如何优雅的回到主页面C#多线程之旅(7)——终止线程Android异步处理技术Docker MachineBFC（Block Formatting Context）基础分析python函数（6）：内置函数和匿名函数Spring-Framework 源码阅读之@Autowired和AutowiredAnnotationBeanPostProcessor你可能需要为你的APP适配iOS11Mybatis框架分析细谈字符串及其格式化表达式[Android FrameWork 6.0源码学习] View的重绘过程之LayoutAndroid Binder机制详解：手写IPC通信Socket 整理以及CocoaAsyncSocket、SRWebSocket源码解析（一）【机器学习】反向传播算法 BP========================<img width="48" height="48" class="pfs" src="//pic.cnblogs.com/face/775365/20160228114235.png" alt=""><img width="48" height="48" class="pfs" src="//pic.cnblogs.com/face/686418/20170722174325.png" alt=""><img width="48" height="48" class="pfs" src="//pic.cnblogs.com/face/733213/20161113215823.png" alt=""><img width="48" height="48" class="pfs" src="//pic.cnblogs.com/face/418791/20130914174932.png" alt=""><img width="48" height="48" class="pfs" src="//pic.cnblogs.com/face/279374/20160822092145.png" alt=""><img width="48" height="48" class="pfs" src="//pic.cnblogs.com/face/1102323/20170803222538.png" alt=""><img width="48" height="48" class="pfs" src="//pic.cnblogs.com/face/u234895.jpg?id=28112946" alt=""><img width="48" height="48" class="pfs" src="//pic.cnblogs.com/face/414640/20160117210953.png" alt=""><img width="48" height="48" class="pfs" src="//pic.cnblogs.com/face/803699/20160923095030.png" alt=""><img width="48" height="48" class="pfs" src="//pic.cnblogs.com/face/704456/20160908115235.png" alt=""><img width="48" height="48" class="pfs" src="//pic.cnblogs.com/face/881297/20160114203735.png" alt=""><img width="48" height="48" class="pfs" src="//pic.cnblogs.com/face/1054024/20161031172341.png" alt=""><img width="48" height="48" class="pfs" src="//pic.cnblogs.com/face/672564/20150920190853.png" alt=""><img width="48" height="48" class="pfs" src="//pic.cnblogs.com/face/992994/20170504141151.png" alt=""><img width="48" height="48" class="pfs" src="//pic.cnblogs.com/face/1055208/20170725183852.png" alt=""><img width="48" height="48" class="pfs" src="//pic.cnblogs.com/face/1165242/20170630211508.png" alt=""><img width="48" height="48" class="pfs" src="//pic.cnblogs.com/face/615210/20140321143008.png" alt=""><img width="48" height="48" class="pfs" src="//pic.cnblogs.com/face/739006/20160530150513.png" alt=""><img width="48" height="48" class="pfs" src="//pic.cnblogs.com/face/1093385/20170109195643.png" alt="">========================标题：创建 overlay 网络 - 每天5分钟玩转 Docker 容器技术（50）博客地址：http://www.cnblogs.com/CloudMan6/p/7280787.html标题：Javascript跨域后台设置拦截博客地址：http://www.cnblogs.com/woshimrf/p/js-cors.html标题：Jenkins发布MVC应用程序博客地址：http://www.cnblogs.com/5ishare/p/7282493.html标题：一步一步学习Vue（十一）博客地址：http://www.cnblogs.com/Johnzhang/p/7282584.html标题：关于“工业互联网平台”建设，俺有本要奏博客地址：http://www.cnblogs.com/lsjwq/p/7282220.html标题：hexo博客MathJax公式渲染问题博客地址：http://www.cnblogs.com/Ai-heng/p/7282110.html标题：使用 Router 实现的模块化，如何优雅的回到主页面博客地址：http://www.cnblogs.com/plokmju/p/7282113.html标题：C#多线程之旅(7)——终止线程博客地址：http://www.cnblogs.com/jackson0714/p/AbortThread.html标题：Android异步处理技术博客地址：http://www.cnblogs.com/hustzhb/p/7278113.html标题：Docker Machine博客地址：http://www.cnblogs.com/shoufengwei/p/7281873.html标题：BFC（Block Formatting Context）基础分析博客地址：http://www.cnblogs.com/asheng2016/p/7281784.html标题：python函数（6）：内置函数和匿名函数博客地址：http://www.cnblogs.com/liluning/p/7280832.html标题：Spring-Framework 源码阅读之@Autowired和AutowiredAnnotationBeanPostProcessor博客地址：http://www.cnblogs.com/liferecord/p/7281655.html标题：你可能需要为你的APP适配iOS11博客地址：http://www.cnblogs.com/wetest/p/7281536.html标题：Mybatis框架分析博客地址：http://www.cnblogs.com/lizo/p/7281441.html标题：细谈字符串及其格式化表达式博客地址：http://www.cnblogs.com/Jeffding/p/7277637.html标题：[Android FrameWork 6.0源码学习] View的重绘过程之Layout博客地址：http://www.cnblogs.com/kezhuang/p/7280746.html标题：Android Binder机制详解：手写IPC通信博客地址：http://www.cnblogs.com/DoNetCoder/p/7280481.html标题：Socket 整理以及CocoaAsyncSocket、SRWebSocket源码解析（一）博客地址：http://www.cnblogs.com/taoxu/p/7064103.html标题：【机器学习】反向传播算法 BP博客地址：http://www.cnblogs.com/KID-XiaoYuan/p/7273683.html========================a[href]：<a href="https://www.cnblogs.com/" title="开发者的网上家园"><img src="/images/logo_small.gif" alt="博客园Logo" width="142" height="55"></a>a[href]：<a href="https://home.cnblogs.com/">园子</a>a[href]：<a href="https://news.cnblogs.com">新闻</a>a[href]：<a href="https://q.cnblogs.com/">博问</a>a[href]：<a 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Reference：

[1] Java1234_小锋, Jsoup简介, http://blog.java1234.com/blog/articles/255.html

[2] Java1234_小锋, Jsoup HelloWorld实现, http://blog.java1234.com/blog/articles/256.html

[3] Java1234_小锋, 使用Jsoup解析出html中的img元素, http://blog.java1234.com/blog/articles/50.html

[4] Java1234_小锋, Jsoup查找DOM元素, http://blog.java1234.com/blog/articles/258.html

[5] Java1234_小锋, Jsoup使用选择器语法查找DOM元素, http://blog.java1234.com/blog/articles/260.html

[6] Java1234_小锋, Jsoup获取DOM元素属性值, http://blog.java1234.com/blog/articles/262.html