Jsoup（三）-- Jsoup使用选择器语法查找DOM元素

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1.Jsoup可以使用类似于CSS或jQuery的语法来查找和操作元素.

2.实例如下：

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.查找所有帖子DOM
Elements elements = document.select(".post_item .post_item_body h3 a");
for(Element ele : elements){
System.out.println("博客标题：" + ele.text());
}
System.out.println("------------------------分割线------------------------"); // 2.查找带有href属性的a元素
Elements hrefElements = document.select("a[href]");
for(Element ele : hrefElements){
System.out.println(ele.toString());
}
System.out.println("------------------------分割线------------------------"); // 3.查找扩展名为.png的图片DOM节点
Elements imgElements = document.select("img[src$=.png]");
for(Element ele : imgElements){
System.out.println(ele.toString());
}
System.out.println("------------------------分割线------------------------"); // 4.获取tag为title的第一个DOM元素
Element titleEle = document.getElementsByTag("title").first();
System.out.println("标题为：" + titleEle.text());
}
if(response != null){
response.close();
}
if(httpClient != null){
httpClient.close();
}
}