java中XML解析

原生xml解析

package com.qust;

import com.qust.entity.Student;
import org.junit.Test;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class TestXML {

    @Test
    public void testXMLPare(){

        try {
            System.out.println(studentList("src/student.xml"));
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        }

    }

    public List<Student> studentList(String xmlFile) throws ParserConfigurationException, IOException, SAXException {
        List<Student> students = new ArrayList<>();

        DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();

        DocumentBuilder documentBuilder = builderFactory.newDocumentBuilder();

        Document document = documentBuilder.parse(xmlFile);

        Student student = null;

        NodeList nodeList = document.getElementsByTagName("student");

        for (int i=0;i<nodeList.getLength();i++){
            student = new Student();
            Node item = nodeList.item(i);
            NodeList childNodes = item.getChildNodes();
            for (int j=0;j<childNodes.getLength();j++){
                Node item1 = childNodes.item(j);
                switch (item1.getNodeName()){
                    case "sname":
                        student.setSname(item1.getTextContent());
                        break;
                    case "sex":
                        student.setSex(item1.getTextContent());
                        break;
                }
            }
            students.add(student);
        }

        return students;
    }
}

---

DOM4J方式解析XML

导入依赖
 

 <dependency>
      <groupId>dom4j</groupId>
      <artifactId>dom4j</artifactId>
      <version>1.6.1</version>
    </dependency>

解析xml文件 

package com.qust;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.junit.Test;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class TestXML {

    @Test
    public void testXMLPare() throws Exception {

            System.out.println(studentList("src/student.xml"));


    }

    public List<Student> studentList(String xmlFile) throws Exception {
        List<Student> students = new ArrayList<>();

        SAXReader saxReader = new SAXReader();

        Document document = saxReader.read(xmlFile);

        Element rootElement = document.getRootElement();

        List<Element> elements = rootElement.elements();
        Student student = null;

        for (Element element : elements){
            List<Element> list = element.elements();

            student = new Student();

            for (Element element1 : list) {
                switch (element1.getName()){
                    case "sname":
                        student.setSname(element1.getText());
                        break;
                    case "sex":
                        student.setSex(element1.getText());
                        break;
                }
            }
            students.add(student);
        }

        return students;
    }
}

 

文件结构和原生相同