Jsoup获取网页标题

亦凉 2022-05-16 22:45 178阅读 0赞

**目录**

jsoup简介

jsoup相关网站

jsoup解析百度首页

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# jsoup简介 #

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。

[jsoup简介][jsoup]

Jsoup解析百度首页 [https://www.baidu.com/][https_www.baidu.com]，通过返回网页内容，获取网页标题。

# jsoup相关网站 #

Jsoup官方地址：[https://jsoup.org/][https_jsoup.org]

Jsoup最新下载：[https://jsoup.org/download][https_jsoup.org_download]

Jsoup文档：[https://jsoup.org/cookbook/introduction/parsing-a-document][https_jsoup.org_cookbook_introduction_parsing-a-document]

# jsoup解析百度首页 #

我们通过一个实例来通过jsoup解析百度首页，输出title。

使用maven来管理项目：

pom.xml:

<dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId>
        <version>4.5.6</version>
    </dependency>
    
    
    
    <dependency>
        <groupId>org.jsoup</groupId>
        <artifactId>jsoup</artifactId>
        <version>1.11.3</version>
    </dependency>

具体实现：

package com.open1111.Jsoup;
    
    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 Demo01 {
    
    	public static void main(String[] args) throws Exception{
    
    CloseableHttpClient httpClient=HttpClients.createDefault();  //创建HttpClient实例
    HttpGet httpGet=new HttpGet("http://www.baidu.com");
    CloseableHttpResponse response=httpClient.execute(httpGet);//执行get请求
           HttpEntity entity=response.getEntity();//获取返回实体
          String webContent=EntityUtils.toString(entity, "utf-8");
          System.out.println("网页内容："+webContent);  //指定编码打印网页内容
          response.close();  //关闭和释放系统资源
         
          Document doc=Jsoup.parse(webContent);
            Elements eles=doc.getElementsByTag("title");
            Element element=eles.get(0);
            System.out.println("标题:"+element.text());
         Element ele=doc.getElementById("ftConw");
         System.out.println("文本："+ele.text());
    	}  
    }

结果输出：

网页内容：<!DOCTYPE html>
    <html> <head><meta http-equiv=content-type content=text/html;charset=utf-8><meta http-equiv=X-UA-Compatible content=IE=Edge><meta content=always name=referrer><link rel=stylesheet type=text/css href=http://s1.bdstatic.com/r/www/cache/bdorz/baidu.min.css><title>百度一下，你就知道</title></head> <body link=#0000cc> <div id=wrapper> <div id=head> <div class=head_wrapper> <div class=s_form> <div class=s_form_wrapper> <div id=lg> <img hidefocus=true src=//www.baidu.com/img/bd_logo1.png width=270 height=129> </div> <form id=form name=f action=//www.baidu.com/s class=fm> <input type=hidden name=bdorz_come value=1> <input type=hidden name=ie value=utf-8> <input type=hidden name=f value=8> <input type=hidden name=rsv_bp value=1> <input type=hidden name=rsv_idx value=1> <input type=hidden name=tn value=baidu><span class="bg s_ipt_wr"><input id=kw name=wd class=s_ipt value maxlength=255 autocomplete=off autofocus></span><span class="bg s_btn_wr"><input type=submit id=su value=百度一下 class="bg s_btn"></span> </form> </div> </div> <div id=u1> <a href=http://news.baidu.com name=tj_trnews class=mnav>新闻</a> <a href=http://www.hao123.com name=tj_trhao123 class=mnav>hao123</a> <a href=http://map.baidu.com name=tj_trmap class=mnav>地图</a> <a href=http://v.baidu.com name=tj_trvideo class=mnav>视频</a> <a href=http://tieba.baidu.com name=tj_trtieba class=mnav>贴吧</a> <noscript> <a href=http://www.baidu.com/bdorz/login.gif?login&tpl=mn&u=http%3A%2F%2Fwww.baidu.com%2f%3fbdorz_come%3d1 name=tj_login class=lb>登录</a> </noscript> <script>document.write('<a href="http://www.baidu.com/bdorz/login.gif?login&tpl=mn&u='+ encodeURIComponent(window.location.href+ (window.location.search === "" ? "?" : "&")+ "bdorz_come=1")+ '" name="tj_login" class="lb">登录</a>');</script> <a href=//www.baidu.com/more/ name=tj_briicon class=bri style="display: block;">更多产品</a> </div> </div> </div> <div id=ftCon> <div id=ftConw> <p id=lh> <a href=http://home.baidu.com>关于百度</a> <a href=http://ir.baidu.com>About Baidu</a> </p> <p id=cp>©2017 Baidu <a href=http://www.baidu.com/duty/>使用百度前必读</a>  <a href=http://jianyi.baidu.com/ class=cp-feedback>意见反馈</a> 京ICP证030173号  <img src=//www.baidu.com/img/gs.gif> </p> </div> </div> </div> </body> </html>
    
    标题:百度一下，你就知道
    文本：关于百度 About Baidu ©2017 Baidu 使用百度前必读  意见反馈 京ICP证030173号

[jsoup]: https://baike.baidu.com/item/jsoup/9012509
[https_www.baidu.com]: https://www.baidu.com/
[https_jsoup.org]: https://jsoup.org/
[https_jsoup.org_download]: https://jsoup.org/download
[https_jsoup.org_cookbook_introduction_parsing-a-document]: https://jsoup.org/cookbook/introduction/parsing-a-document