Jsoup (3)

Quick and easy way:

selector: selector

• Methods used: Elements select (String cssQuery)
• Syntax: Syntax class defined in the Reference Selector

xml file:

Selector Demo:

the XPath :
the XPath path is the XML language, which is a section for determining a position of the XML language (a subset of the Standard Generalized Markup Language) document

• Jsoup use of Xpath require additional import jar package.
  
  xpath Demo:

import cn.wanghaomiao.xpath.exception.XpathSyntaxErrorException;
import cn.wanghaomiao.xpath.model.JXDocument;
import cn.wanghaomiao.xpath.model.JXNode;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;

import java.io.File;
import java.io.IOException;
import java.util.List;

/**
 * @ClassName: JsoupDemo5
 * @Description: TODO
 * @author: Doge_fang
 * @date: 2020/3/1  19:02
 */
public class JsoupDemo5 {
    public static void main(String[] args) throws IOException, XpathSyntaxErrorException {
        //1.获取student.xml的path
        String path = JsoupDemo5.class.getClassLoader().getResource("student.xml").getPath();
        //2.获取Document对象
        Document document = Jsoup.parse(new File(path), "utf-8");

        //3.根据document对象，创建JXDocument对象
        JXDocument jxDocument = new JXDocument(document);

        //4.结合xpath语法查询
        //4.1查询所有student标签
        List<JXNode> jxNodes = jxDocument.selN("//student");
        for (JXNode jxNode : jxNodes) {
            System.out.println(jxNode);
        }

        System.out.println("--------------------");

        //4.2查询所有student标签下的name标签
        List<JXNode> jxNodes2 = jxDocument.selN("//student/name");
        for (JXNode jxNode : jxNodes2) {
            System.out.println(jxNode);
        }

        System.out.println("--------------------");

        //4.3查询student标签下带有id属性的name标签
        List<JXNode> jxNodes3 = jxDocument.selN("//student/name[@id]");
        for (JXNode jxNode : jxNodes3) {
            System.out.println(jxNode);
        }
        System.out.println("--------------------");
        //4.4查询student标签下带有id属性的name标签 并且id属性值为itcast

        List<JXNode> jxNodes4 = jxDocument.selN("//student/name[@id='doge']");
        for (JXNode jxNode : jxNodes4) {
            System.out.println(jxNode);
        }
    }
}