java通过Jsoup爬取网页过程详解

这篇文章主要介绍了java通过Jsoup爬取网页过程详解,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

一，导入依赖

<!--java爬虫-->
   <dependency>
     <groupId>org.jsoup</groupId>
     <artifactId>jsoup</artifactId>
     <version>1.10.3</version>
   </dependency>
   <!--httpclient依赖-->
   <dependency>
     <groupId>org.apache.httpcomponents</groupId>
     <artifactId>httpclient</artifactId>
   </dependency>

二，编写demo类

注意不要导错包了,是org.jsoup.nodes下面的

package com.taotao.entity;
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;

import java.io.IOException;

/**
* Author: TaoTao 2019/9/26
*/
public class intefaceTest {
 public static void main(String[] args) throws IOException {
   CloseableHttpClient httpClient = HttpClients.createDefault();//创建httpClient
   HttpGet httpGet = new HttpGet("http://www.cnblogs.com/");//创建httpget实例

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

Jsoup.parse(content);
   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文档
   Element element = elements.get(0);//获取第一个元素
   String title = element.text(); //.html是返回html
   System.out.println("网页标题："+title);
   Element element1 = doc.getElementById("site_nav_top");//获取id=site_nav_top标签
   String str = element1.text();
   System.out.println("str:"+str);
 }
}

来源：https://www.cnblogs.com/book-mountain/p/11595018.html