如何解析xml文件

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import java.io.File;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathFactory;

/**
 * @author shiqil.liu
 * @date 2019-08-21 17:05
 */
public class DealXml {
    private static Logger logger = LoggerFactory.getLogger(DealXml.class);
   /* public static void main(String[] args) {
        try {
            Document doc=loadDocument("aaa.xml");
            XPathFactory factory = XPathFactory.newInstance();//实例化XPathFactory对象
            XPath xpath = factory.newXPath();
            XPathExpression compile = xpath.compile("//import");//一个斜线代表一层，应该也可以写成//import!
            NodeList nodes = (NodeList)compile.evaluate(doc, XPathConstants.NODESET);//获取student节点的所有节点
            for(int i=0;i<nodes.getLength();i++) {
                Element item = (Element) nodes.item(i);
                String s1 = item.getAttribute("resource");
                System.out.println(s1);
            }
        } catch (Exception e) {
            e.printStackTrace();

        }


        //org.dom4j.io.SAXReader reader = new SAXReader();  从inputStream读取
        //Document doc = reader.read(inputStream);
    }*/


    public static void main(String[] args) {
        try {
            Document doc = loadDocument("bbb.xml");
            XPathFactory factory = XPathFactory.newInstance();//实例化XPathFactory对象
            XPath xpath = factory.newXPath();
            XPathExpression compile = xpath.compile("//form");//一个斜线代表一层，应该也可以写成//import!
            NodeList nodes = (NodeList) compile.evaluate(doc, XPathConstants.NODESET);//获取student节点的所有节点
            for (int i = 0; i < nodes.getLength(); i++) {
                Element item = (Element) nodes.item(i);
                String s1 = item.getAttribute("controller");
                String s2 = item.getAttribute("action");
                System.out.println(s1 + "_" + s2);
                NodeList childNodes = item.getElementsByTagName("property");
                //NodeList childNodes = item.getChildNodes();
                for (int j = 0; j < childNodes.getLength(); j++) {
                    Element item1 = (Element) childNodes.item(j);
                    String ss1 = item1.getAttribute("name");
                    String ss2 = item1.getAttribute("option");
                    String ss3 = item1.getAttribute("regex");
                    String ss4 = item1.getAttribute("message");

                    System.out.println(ss1 + "_" + ss2 + "_" + ss3 + "_" + ss4);
                }

                System.out.println("");
                System.out.println("---------------------------------");
                System.out.println("");
            }
        } catch (Exception e) {
            e.printStackTrace();

        }


        //org.dom4j.io.SAXReader reader = new SAXReader();  从inputStream读取
        //Document doc = reader.read(inputStream);
    }

    private static Document loadDocument(String path) throws Exception {
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();//实例化DocumentBuilderFactory对象
        DocumentBuilder builder = dbf.newDocumentBuilder();
        File file = new File(Thread.currentThread().getContextClassLoader().getResource(path).getPath());
        if (file.exists()) {
            return builder.parse(file);
        } else {
            logger.warn("配置文件没有被找到{}", path);
            return null;
        }

    }
}