一、Jsoup查找DOM元素的方法
getElementById(String id) 根据id 来查询DOM
getElementsByTag(String tagName) 根据tag 名称来查询DOM
getElementsByClass(String className) 根据样式名称来查询DOM
getElementsByAttribute(String key) 根据属性名来查询DOM
getElementsByAttributeValue(String key,String value) 根据属性名和属性值来查询DOM
二、代码实现
public static void main(String[] args) throws Exception{
// 创建httpClient实例
CloseableHttpClient httpClient = HttpClients.createDefault();
// 创建httpGet实例
HttpGet httpGet = new HttpGet("http://www.cnblogs.com");
httpGet.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Firefox/45.0");
CloseableHttpResponse response = httpClient.execute(httpGet);
String content = null;
if(response != null){
HttpEntity entity = response.getEntity();
content = EntityUtils.toString(entity, "UTF-8"); // 获取网页内容
Document document = Jsoup.parse(content); // 解析网页，得到文档对象
/**
* 1.根据tag获取元素
*/
Elements elements = document.getElementsByTag("title"); // 获取 tag为 title的DOM元素
Element element = elements.get(0); // 获取第一个DOM元素
String title = element.text(); // 返回元素的文本
System.out.println("博客园的标题：" + title);
/**
* 2.根据 id获取元素
*/
Element element2 = document.getElementById("site_nav_top");
String navTop = element2.text();
System.out.println("座右铭：" + navTop);
/**
* 3.根据样式获取元素
*/
Elements elements3 = document.getElementsByClass("post_item");
System.out.println("============根据样式获取元素=============");
for(Element e : elements3){
System.out.println(e.html());
System.out.println("------------------------------");
}
/**
* 4.根据属性名称来查询DOM
*/
Elements elements4 = document.getElementsByAttribute("width");
System.out.println("============根据属性名称来查询DOM=============");
for(Element e : elements4){
System.out.println(e.toString());
System.out.println("------------------------------");
}
/**
* 5.根据属性名和属性值来查询DOM
*/
Elements elements5 = document.getElementsByAttributeValue("target", "_blank");
System.out.println("============ 根据属性名和属性值来查询DOM=============");
for(Element e : elements5){
System.out.println(e.toString());
System.out.println("------------------------------");
}
}
if(response != null){
response.close();
}
if(httpClient != null){
httpClient.close();
}
}