WebMagic的学习基础:Jsoup的学习(Jsoup基础API+Http+Jsoup实战爬取)
Jsoup的Selector选择器API:
@Test public void TestSelector() throws Exception { //解析文件 Document document = Jsoup.parse(new File("C:\\Users\\SuperMan\\Desktop\\test.html"), "utf8"); //通过标签查找元素 Elements elements = document.select("span"); for (Element e : elements ) { System.out.println(e.text()); } //通过ID来查找元素 在id前加上# Element element = document.select("#city_bj").first(); System.out.println(element.text()); //通过属性来分析 中括号包围 Element element1 = document.select("[abc]").first(); System.out.println(element1.text()); //通过Class查找 在查找内容前加上. 类似htnl文本 Element element2 = document.select(".fdnav").first(); System.out.println(element2.text()); //通过属性-值的方式查找 中括号包围,等号表示匹配 Elements elements1 = document.select("[class=icon_fuli]"); for (Element e : elements1 ) { System.out.println(e.text()); } }
Jsoup的Selector选择器组合的API:
@Test public void testSelectorGroup() throws Exception { //解析文件 Document document = Jsoup.parse(new File("C:\\Users\\SuperMan\\Desktop\\test.html"), "utf8"); //el#id 元素加id Element element=document.select("h3#city_bj").first(); System.out.println(element.text()); //el.class 元素加class Element element1=document.select("span.s_name").first(); System.out.println(element1.text()); //el[sttr] 元素+属性名 Element element2=document.select("span[abc]").first(); System.out.println(element2.text()); //任意组合 Element element3=document.select("span[abc].s_name").first(); System.out.println(element3.text()); //ancestor child 查找某个元素下子元素 Elements elements=document.select(".city_con li"); for (Element e:elements ) { System.out.println(e.text()); } //查找元素下的直接子元素 Elements elements1=document.select(".city_con > ul >li"); for (Element e:elements ) { System.out.println(e.text()); } //查找父元素的所有直接子元素 Elements elements2=document.select(".city_con >ul > *"); for (Element e:elements2 ) { System.out.println(e.text()); } }