JavaWeb - XML

package XML_Document.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;

public class Jsoup_Demo01 {
    public static void main(String[] args) throws IOException {
        //获取document对象，根据xml获得
        //2.1通过类加载器获取myxml的path
        String path = Jsoup_Demo01.class.getClassLoader().getResource("XML_Document/myxml.xml").getPath();
        //2.2 解析xml文档 加载文档进内存，获取dom数 - -  > Document
        Document document = Jsoup.parse(new File(path), "utf-8");

        //3.获取元素对象
        Elements elements = document.getElementsByTag("name");

        //4.获取第一个name的element对象
        Element element = elements.get(0);
        //获取数据
        System.out.println(element.text());
    }
}

package XML_Document.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;

public class Jsoup_Demo02 {
    public static void main(String[] args) throws IOException {
        String path = Jsoup_Demo01.class.getClassLoader().getResource("XML_Document/myxml.xml").getPath();
        Document document = Jsoup.parse(new File(path), "utf-8");

        //这是通过document来获取name标签，可以获取到两个
        Elements elements = document.getElementsByTag("name");
        System.out.println(elements);

        //先获取第一个student元素，然后通过element对象获取其子标签name，此时获取到1个
        Element element_student01 = document.getElementsByTag("student").get(0);
        Elements name = element_student01.getElementsByTag("name");
        System.out.println(name);
        System.out.println(name.text());

        //获取student对象的属性值
        String number = element_student01.attr("number");
        System.out.println(number);
    }
}

package XML_Document.Jsoup;

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

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

public class Jsoup_Demo03 {
    public static void main(String[] args) throws IOException {
        String path = Jsoup_Demo01.class.getClassLoader().getResource("XML_Document/myxml.xml").getPath();
        Document document = Jsoup.parse(new File(path), "utf-8");

        //根据选择器来查找

        //1.查找所有name标签
        Elements name = document.select("name");

        //2.查找id值为3
        Elements tag = document.select("#s002");
//        System.out.println(tag);

        //获取student标签里number为s002的age子标签
        Elements elements_student = document.select("student[number=\"s002\"]");
        System.out.println(elements_student);
        Elements elements_student_age = document.select("student[number=\"s002\"] > age");
        System.out.println("==============");
        System.out.println(elements_student_age);
    }
}

package XML_Document.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;

public class Jsoup_Demo04 {
    public static void main(String[] args) throws IOException, XpathSyntaxErrorException {
        String path = Jsoup_Demo01.class.getClassLoader().getResource("XML_Document/myxml.xml").getPath();
        Document document = Jsoup.parse(new File(path), "utf-8");

        //根据document对象，创建JXDocument对象（因为他支持java语法）
        JXDocument jxDocument = new JXDocument(document);

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

        System.out.println("==========");
        //查询所有student标签下的name标签
        List<JXNode> jxNodes1 = jxDocument.selN("//student/name");
        for (JXNode jxNode : jxNodes1) {
            System.out.println(jxNode);
        }

        //查询student标签下带有id属性的name标签
        List<JXNode> jxNodes2 = jxDocument.selN("//student/name[@id]");
        for (JXNode jxNode : jxNodes2) {
            System.out.println(jxNode);
        }

        //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> jxNodes3 = jxDocument.selN("//student/name[@id=‘001‘]");
        for (JXNode jxNode : jxNodes3) {
            System.out.println(jxNode);
        }
    }
}