先给出网页地址:
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https://wall.alphacoders.com/featured.php?lang=Chinese |
主要步骤:
利用Jsoup的connect方法获取Document对象
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String html = "https://wall.alphacoders.com/featured.php?lang=Chinese" ; Document doc = Jsoup.connect(html).get(); |
内容过长,就不再显示。
我们以这部分为例:
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< ul class = "nav nav-pills" > < li >< a href = "https://alphacoders.com/site/about-us" rel = "external nofollow" rel = "external nofollow" >About Us</ a ></ li > < li >< a href = "https://alphacoders.com/site/faq" rel = "external nofollow" rel = "external nofollow" >FAQ</ a ></ li > < li >< a href = "https://alphacoders.com/site/privacy" rel = "external nofollow" rel = "external nofollow" >Privacy Policy</ a ></ li > < li >< a href = "https://alphacoders.com/site/tos" rel = "external nofollow" rel = "external nofollow" >Terms Of Service</ a ></ li > < li >< a href = "https://alphacoders.com/site/acceptable_use" rel = "external nofollow" rel = "external nofollow" >Acceptable Use</ a ></ li > < li >< a href = "https://alphacoders.com/site/etiquette" rel = "external nofollow" rel = "external nofollow" >Etiquette</ a ></ li > < li >< a href = "https://alphacoders.com/site/advertising" rel = "external nofollow" rel = "external nofollow" >Advertise With Us</ a ></ li > < li >< a id = "change_consent" >Change Consent</ a ></ li > </ ul > |
我们先找到所有的ul:
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Elements elements = doc.getElementsByTag( "ul" ); |
输出如下:
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< ul class = "nav navbar-nav center" > < li > < a title = "Submit Wallpapers" href = "https://alphacoders.com/site/submit-wallpaper" rel = "external nofollow" >< i class = "el el-circle-arrow-up" ></ i > 提交</ a > </ li > < li > < a href = "https://alphacoders.com/contest" rel = "external nofollow" >< i class = "el el-gift" ></ i > 精美奖品</ a > </ li > </ ul > < ul class = "nav navbar-nav navbar-right center" > < li > < a href = "language.php?lang=Chinese" rel = "external nofollow" > < img src = "https://static.alphacoders.com/wa/Chinese-flag.png" alt = "Chinese-flag" > 中文 </ a > </ li > < li > < a href = "https://alphacoders.com/users/login" rel = "external nofollow" >< i class = "el el-user" ></ i > 登录</ a > </ li > < li > < a href = "https://alphacoders.com/users/register" rel = "external nofollow" >< i class = "el el-edit" ></ i > 注册</ a > </ li > </ ul > < ul class = "pagination" > < li class = "active" >< a id = "prev_page" href = "#" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >< 上一页</ a ></ li > < li class = "active" >< a >1</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=2" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >2</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=3" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >3</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=4" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >4</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=5" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >5</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=6" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >6</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=7" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >7</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=8" rel = "external nofollow" >8</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=9" rel = "external nofollow" >9</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=10" rel = "external nofollow" >10</ a ></ li > < li >< a >...</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=319" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >319</ a ></ li > < li >< a id = "next_page" href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=2" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >下一页 ></ a ></ li > </ ul > < ul class = "pagination" > < li class = "active" >< a href = "#" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >< 上一页</ a ></ li > < li class = "active" >< a >1</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=2" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >2</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=3" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >3</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=4" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >4</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=5" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >5</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=6" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >6</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=7" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >7</ a ></ li > < li >< a >...</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=319" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >319</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=2" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >下一页 ></ a ></ li > </ ul > < ul class = "pagination" > < li class = "active" >< a href = "#" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" ><< </ a ></ li > < li class = "active" >< a href = "#" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >< 上一页</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=2" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >下一页 ></ a ></ li > < li >< a title = "末页 (319)" href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=319" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" > >></ a ></ li > </ ul > < ul class = "pagination" > < li class = "active" >< a href = "#" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >1</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=2" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >2</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=3" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >3</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=4" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >4</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=5" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >5</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=6" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >6</ a ></ li > < li >< a href = "https://wall.alphacoders.com/featured.php?lang=Chinese&page=7" rel = "external nofollow" rel = "external nofollow" rel = "external nofollow" >7</ a ></ li > </ ul > < ul class = "nav nav-pills" > < li >< a href = "https://alphacoders.com/site/about-us" rel = "external nofollow" rel = "external nofollow" >About Us</ a ></ li > < li >< a href = "https://alphacoders.com/site/faq" rel = "external nofollow" rel = "external nofollow" >FAQ</ a ></ li > < li >< a href = "https://alphacoders.com/site/privacy" rel = "external nofollow" rel = "external nofollow" >Privacy Policy</ a ></ li > < li >< a href = "https://alphacoders.com/site/tos" rel = "external nofollow" rel = "external nofollow" >Terms Of Service</ a ></ li > < li >< a href = "https://alphacoders.com/site/acceptable_use" rel = "external nofollow" rel = "external nofollow" >Acceptable Use</ a ></ li > < li >< a href = "https://alphacoders.com/site/etiquette" rel = "external nofollow" rel = "external nofollow" >Etiquette</ a ></ li > < li >< a href = "https://alphacoders.com/site/advertising" rel = "external nofollow" rel = "external nofollow" >Advertise With Us</ a ></ li > < li >< a id = "change_consent" >Change Consent</ a ></ li > </ ul > |
可以发现class为"nav nav-pills"的只有一个,我们找到它:
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Elements elements = doc.getElementsByTag( "ul" ); //System.out.println(elements); Element tempElement = null ; for (Element element : elements) { if (element.className().equals( "nav nav-pills" )) { tempElement = element; //System.out.println(element.className()); break ; } } |
循环遍历这个ul,输出其中每一个li里每一个a的href和rel属性:
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Elements li = tempElement.getElementsByTag( "li" ); for (Element element : li) { Elements element2 = element.getElementsByTag( "a" ); for (Element element3 : element2) { String hrefString = element3.attr( "href" ); String relString = element3.attr( "rel" ); if (hrefString != "" && relString != "" ) { System.out.println( "href=" + hrefString + " rel=" external nofollow " rel=" external nofollow " " + "rel=" + relString); } } } |
最终结果:
href=https://alphacoders.com/site/about-us rel=nofollow
href=https://alphacoders.com/site/faq rel=nofollow
href=https://alphacoders.com/site/privacy rel=nofollow
href=https://alphacoders.com/site/tos rel=nofollow
href=https://alphacoders.com/site/acceptable_use rel=nofollow
href=https://alphacoders.com/site/etiquette rel=nofollow
href=https://alphacoders.com/site/advertising rel=nofollow
完整代码:
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import org.jsoup.nodes.Document; import org.jsoup.nodes.Element; import org.jsoup.select.Elements; import java.io.IOException; import org.jsoup.Jsoup; /** * @ClassName: Jsoup_Test * @description: * @author: KI * @Date: 2020年8月17日 下午8:15:14 */ public class Jsoup_Test { public static void main(String[] args) throws IOException { // TODO 自动生成的方法存根 String html = "https://wall.alphacoders.com/featured.php?lang=Chinese" ; Document doc = Jsoup.connect(html).get(); System.out.println(doc); Elements elements = doc.getElementsByTag( "ul" ); //System.out.println(elements); Element tempElement = null ; for (Element element : elements) { if (element.className().equals( "nav nav-pills" )) { tempElement = element; //System.out.println(element.className()); break ; } } System.out.println(tempElement); Elements li = tempElement.getElementsByTag( "li" ); for (Element element : li) { Elements element2 = element.getElementsByTag( "a" ); for (Element element3 : element2) { String hrefString = element3.attr( "href" ); String relString = element3.attr( "rel" ); if (hrefString != "" && relString != "" ) { System.out.println( "href=" + hrefString + " rel=" external nofollow " rel=" external nofollow " " + "rel=" + relString); } } } } } |
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原文链接:https://blog.csdn.net/Cyril_KI/article/details/108073933