XML获取指定路径下的节点值

效果图

xml指定的taxML/school/name路径值是：喜洋洋小学
xml指定的taxML/class/student[0]/name路径值是：小明
xml指定的路径taxML/class/student[2]/father/name值是：大亮
xml指定的路径taxML/class/student[2]/father/sons/son[1]/name值是：二亮

Process finished with exit code 0

格式化的xml数据

<?xml version="1.0" encoding="UTF-8"?>
<taxML xmlns="http://www.chinatax.gov.cn/dataspec/">
    <class>
        <student>
            <name>小明</name>
            <age>8</age>
            <father>
                <name>大明</name>
                <age>40</age>
            </father>
        </student>
        <student>
            <name>小红</name>
            <age>8</age>
            <father>
                <name>大红</name>
                <age>42</age>
            </father>
        </student>
        <student>
            <name>小亮</name>
            <age>8</age>
            <father>
                <name>大亮</name>
                <age>39</age>
                <sons>
                    <son>
                        <name>小亮</name>
                        <age>8</age>
                    </son>
                    <son>
                        <name>二亮</name>
                        <age>10</age>
                    </son>
                </sons>
            </father>
        </student>
    </class>
    <school>
        <name>喜洋洋小学</name>
        <age>8</age>
    </school>
</taxML>

需要导入的包

import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.Document;

自己写的代码

    public static void main(String[] args){
//        String strXml =  FileUtil.readFile("C:\\Users\\kungeek\\Desktop\\test\\school.xml");
        String strXml ="<?xml version=\"1.0\" encoding=\"UTF-8\"?><taxML xmlns=\"http://www.chinatax.gov.cn/dataspec/\"><class><student><name>小明</name><age>8</age><father><name>大明</name><age>40</age></father></student><student><name>小红</name><age>8</age><father><name>大红</name><age>42</age></father></student><student><name>小亮</name><age>8</age><father><name>大亮</name><age>39</age><son><name>小亮</name><age>8</age></son><son><name>二亮</name><age>10</age></son></father></student></class><school><name>喜洋洋小学</name><age>8</age></school></taxML>";
        String value = xmlpathValue(strXml,"taxML/school/name");
        String value2 = xmlpathValue(strXml,"taxML/class/student[0]/name");
        String value3 = xmlpathValue(strXml,"taxML/class/student[2]/father/name");
        String value4 = xmlpathValue(strXml,"taxML/class/student[2]/father/son[1]/name");

        System.out.println("xml指定的值是："+value);
        System.out.println("xml指定的值是："+value2);
        System.out.println("xml指定的值是："+value3);
        System.out.println("xml指定的值是："+value4);
    }

    public static String xmlpathValue(String xml ,String xmlPath){
        try {
            Document document = DocumentHelper.parseText(xml);
            String [] eleName = xmlPath.split("/");
            List<String> list = new LinkedList<>(Arrays.asList(eleName));
            //获取文档根节点
            Element root = document.getRootElement();
            String rootName = root.getName();
            if(rootName.equals(list.get(0))){
                list.remove(0);
                return getNodeElement(root,list);
            }else{
                return null;
            }
        } catch (Exception e) {
            return null;
        }
    }

    public static String getNodeElement(Element element,List<String> list) {
        //不做为空判断，如果数据格式错误，就应该抛错
        String eleName = list.get(0);
        if(list.size()>1){
            if(eleName.indexOf("[") > -1 && eleName.indexOf("]") >-1){
                List<Element> listChild = element.elements();
                String eleIndex = eleName.substring(eleName.indexOf("[")+1,eleName.indexOf("]"));
                Element child = listChild.get(Integer.parseInt(eleIndex));
                list.remove(0);
                return getNodeElement(child,list);
            }else{
                Element child = element.element(eleName);
                list.remove(0);
                return getNodeElement(child,list);
            }
        }else{
            return element.element(eleName).getText();
        }
    }