xml解析_Jsoup_根据选择器查询、根据Xpath查询

xml解析_Jsoup_根据选择器查询

快捷查询方式：

　　selector：选择器

　　　　使用的方法：Elements  select(String  cssQuery)

　　　　　　语法：参考Selector类中定义的语法

package cn.itcast.xml.jsoup;


import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

import java.io.File;
import java.io.IOException;

/**
 *Element对象功能
 */
public class JsoupDemo5 {
    public static void main(String[] args) throws IOException {
        //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");

        Elements name = document.select("name");
        System.out.println(name);
        System.out.println("=====================");
        //查询id值为itcast的元素
        Elements select = document.select("#itcast");
        System.out.println(select);
        System.out.println("=====================");
        //获取student标签并且number属性值为heima_0001的age子标签
        //获取student标签并且number属性值为heima_0001
        Elements select1 = document.select("student[number='heima_0001']");
        System.out.println(select1);
        System.out.println("=====================");
        //获取student标签并且number属性值为heima_0001的age子标签
        Elements select2 = document.select("student[number='heima_0001'] > age");
        System.out.println(select2);
    }

}

<?xml version="1.0" encoding="UTF-8" ?>

<students>
    <student number="heima_0001">
        <name id="itcast">
            <xing>张</xing>
            <ming>三</ming>
        </name>
        <age>18</age>
        <sex>male</sex>
    </student>
    <student number="heima_0002">
        <name>jack</name>
        <age>18</age>
        <sex>female</sex>
    </student>

</students>

xml解析_Jsoup_根据Xpath查询

XPath：Xpath即为XML路径语言，它是一种用来确定XML(标准通用标记语言的子集)文档中某部分位置的语言

　　使用JSoup的Xpath需要额外导入jar包

　　查询w3cshool参考手册，使用xpath的语法完成查询

在libs包中导入jar包，添加为库

package cn.itcast.xml.jsoup;


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 org.jsoup.select.Elements;

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

/**
 *Element对象功能
 */
public class JsoupDemo6 {
    public static void main(String[] args) throws IOException, XpathSyntaxErrorException {
        //1.获取student.xml的path
        String path = JsoupDemo6.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.集合Xpath语法查询
        //查询所有student标签
        List<JXNode> jxNodes = jxDocument.selN("//student");
        for (JXNode jxNode : jxNodes) {
            System.out.println(jxNode);
        }
        System.out.println("==================");
        List<JXNode> jxNodes1 = jxDocument.selN("//student/name");
        for (JXNode jxNodes12 : jxNodes1) {
            System.out.println(jxNodes12);
        }
        System.out.println("==================");
        List<JXNode> jxNodes2 = jxDocument.selN("//student/name[@id]");
        for (JXNode jxNodes13 : jxNodes2) {
            System.out.println(jxNodes13);
        }
    }

}