认识达内从这里开始

昆明达内培训的小编这一期给大家讲Jsoup查找dom元素。

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 Demo02 {//

public static void main(String[] args) throws Exception{

CloseableHttpClient httpclient = HttpClients.createDefault(); //创建httpclient实例

HttpGet httpget = new HttpGet("#/"); //创建httpget实例

CloseableHttpResponse response = #(httpget); //执行get请求

HttpEntity entity=response.getEntity(); //获取返回实体

String content=EntityUtils.toString(entity, "utf-8");//设置content编码

response.close(); //关闭流和释放系统资源

Document doc=Jsoup.parse(content); //解析网页得到文档对象

Elements elements=doc.getElementsByTag("title"); //获取tag是title的所有DOM元素

Element element=elements.get(0); //获取第1个元素

String title=element.text(); //返回元素的文本

System.out.println("网页标题是："+title);

Element element2=doc.getElementById("site_nav_top"); //获取id=site_nav_top的DOM元素

String avTop=element2.text(); //返回元素的文本

System.out.println("口号："+navTop);

Elements itemElements=doc.getElementsByClass("post_item"); //根据样式名称来查询DOM

System.out.println("=======输出post_item==============");

for(Element e:itemElements){//for加强循环

System.out.println(e.html());

System.out.println("-------------");

}

Elements widthElements=doc.getElementsByAttribute("width"); //根据属性名称来查询DOM

System.out.println("=======输出with的DOM==============");

for(Element e:widthElements){

System.out.println(e.toString());

System.out.println("-------------");

}

Elements targetElements=doc.getElementsByAttributeValue("target", "_blank");//根据属性名和属性值来获取dom元素

System.out.println("=======输出target-_blank的DOM==============");

for(Element e:targetElements){

System.out.println(e.toString());

System.out.println("-------------");

}

}

}

了解详情请登陆昆明达内IT培训官网（km.tedu.cn）！