Java 파충류:dom 메서드를 사용하여 Document 객체 스트리밍

먼저 웹 주소를 입력하십시오.

https://wall.alphacoders.com/featured.php?lang=Chinese

주요 단계:

Jsoup의connect 방법을 이용하여 Document 대상을 획득

String html = "https://wall.alphacoders.com/featured.php?lang=Chinese";
Document doc = Jsoup.connect(html).get();

컨텐트가 너무 길면 더 이상 표시되지 않습니다.
우리는 이 부분을 예로 들 수 있다.

<ul class="nav nav-pills"> 
    <li><a href="https://alphacoders.com/site/about-us" rel="nofollow">About Usa>li> 
    <li><a href="https://alphacoders.com/site/faq" rel="nofollow">FAQa>li> 
    <li><a href="https://alphacoders.com/site/privacy" rel="nofollow">Privacy Policya>li> 
    <li><a href="https://alphacoders.com/site/tos" rel="nofollow">Terms Of Servicea>li> 
    <li><a href="https://alphacoders.com/site/acceptable_use" rel="nofollow">Acceptable Usea>li> 
    <li><a href="https://alphacoders.com/site/etiquette" rel="nofollow">Etiquettea>li> 
    <li><a href="https://alphacoders.com/site/advertising" rel="nofollow">Advertise With Usa>li> 
    <li><a id="change_consent">Change Consenta>li> 
ul> 

우리 먼저 모든ul:

을 찾자.

Elements elements = doc.getElementsByTag("ul");

출력은 다음과 같습니다.

<ul class="nav navbar-nav center"> 
 <li> <a title="Submit Wallpapers" href="https://alphacoders.com/site/submit-wallpaper"><i class="el el-circle-arrow-up">i>  a> li> 
 <li> <a href="https://alphacoders.com/contest"><i class="el el-gift">i>  a> li> 
ul>
<ul class="nav navbar-nav navbar-right center"> 
 <li> <a href="language.php?lang=Chinese"> <img src="https://static.alphacoders.com/wa/Chinese-flag.png" alt="Chinese-flag">        a> li> 
 <li> <a rel="nofollow" href="https://alphacoders.com/users/login"><i class="el el-user">i>  a> li> 
 <li> <a href="https://alphacoders.com/users/register"><i class="el el-edit">i>  a> li> 
ul>
<ul class="pagination"> 
 <li class="active"><a id="prev_page" href="#"><  a>li> 
 <li class="active"><a>1a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=2">2a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=3">3a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=4">4a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=5">5a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=6">6a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=7">7a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=8">8a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=9">9a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=10">10a>li> 
 <li><a>...a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=319">319a>li> 
 <li><a id="next_page" href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=2">  >a>li> 
ul>
<ul class="pagination"> 
 <li class="active"><a href="#"><  a>li> 
 <li class="active"><a>1a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=2">2a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=3">3a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=4">4a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=5">5a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=6">6a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=7">7a>li> 
 <li><a>...a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=319">319a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=2">  >a>li> 
ul>
<ul class="pagination"> 
 <li class="active"><a href="#"><< a>li> 
 <li class="active"><a href="#"><  a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=2">  >a>li> 
 <li><a title="  (319)" href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=319"> >>a>li> 
ul>
<ul class="pagination"> 
 <li class="active"><a href="#">1a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=2">2a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=3">3a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=4">4a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=5">5a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=6">6a>li> 
 <li><a href="https://wall.alphacoders.com/featured.php?lang=Chinese&page=7">7a>li> 
ul>
<ul class="nav nav-pills"> 
 <li><a href="https://alphacoders.com/site/about-us" rel="nofollow">About Usa>li> 
 <li><a href="https://alphacoders.com/site/faq" rel="nofollow">FAQa>li> 
 <li><a href="https://alphacoders.com/site/privacy" rel="nofollow">Privacy Policya>li> 
 <li><a href="https://alphacoders.com/site/tos" rel="nofollow">Terms Of Servicea>li> 
 <li><a href="https://alphacoders.com/site/acceptable_use" rel="nofollow">Acceptable Usea>li> 
 <li><a href="https://alphacoders.com/site/etiquette" rel="nofollow">Etiquettea>li> 
 <li><a href="https://alphacoders.com/site/advertising" rel="nofollow">Advertise With Usa>li> 
 <li><a id="change_consent">Change Consenta>li> 
ul>

class가'nav nav-pills'인 것을 발견할 수 있는 것은 하나뿐입니다.

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;
	}
}

이 l을 순환하고 그 중 각 l에 있는 a의 href와rel 속성을 출력한다.

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=" + relString);
		}
	}
}

최종 결과:

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

전체 코드:

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 8 17   8:15:14
 */

public class Jsoup_Test {

	public static void main(String[] args) throws IOException {
		// TODO  
		
		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=" + relString);
				}
			}
		}		

	}

}