Day1 Java to read XML file

Spring by parsing XML configuration file, the containers are initialized with the reflection technique.

Environment configuration:
Import package dom4j

<!-- https://mvnrepository.com/artifact/dom4j/dom4j -->
<dependency>
    <groupId>dom4j</groupId>
    <artifactId>dom4j</artifactId>
    <version>1.6.1</version>
</dependency>

Use SAXReader read xml file

1. Creating SAXReader SAXReader reader = new SAXReader();
2. Create a xml file resource URL xmlUrl = XmlReaderTest.class.getClassLoader().getResource("applicationContext.xml");
3. The XML files and associated resources SAXReader Document doc = reader.read(xmlUrl);
4. Access XML nodes and node attributes
   get the root node (an XML only one root node):

Element rootEle = doc.getRootElement();

Walk the child nodes:

while (iterator.hasNext()) {
     parseElement(iterator.next());
}

Gets node attributes:

Iterator<Attribute> attributeIterator = element.attributeIterator();
   while (attributeIterator.hasNext()) {
      Attribute attribute = attributeIterator.next();
      System.out.println(attribute.getName() + ": " + attribute.getValue());
}

Sample code:

import org.dom4j.*;
import org.dom4j.io.SAXReader;

import java.net.URL;
import java.util.Iterator;
import java.util.List;

public class XmlReaderTest {

    static void parseElement(Element element) {
        System.out.println("标签名：" + element.getName());
        System.out.println("属性：");
        Iterator<Attribute> attributeIterator = element.attributeIterator();
        while (attributeIterator.hasNext()) {
            Attribute attribute = attributeIterator.next();
            System.out.println(attribute.getName() + ": " + attribute.getValue());
        }
        List<Element> subElementList = element.elements();
        if (subElementList.size() > 0) {
            System.out.println("子标签：");
        }
        for (Element subElement: subElementList) {
            parseElement(subElement);
        }
    }

    public static void main(String[] args) throws Exception {

        SAXReader reader = new SAXReader();
        URL xmlUrl = XmlReaderTest.class.getClassLoader().getResource("applicationContext.xml");
        Document doc =  reader.read(xmlUrl);
        Element rootEle = doc.getRootElement();
        System.out.println("root Element: " + rootEle.getName());

        Iterator<Element> iterator = rootEle.elementIterator();
        while (iterator.hasNext()) {
            parseElement(iterator.next());
        }
    }
}

operation result:

root Element: beans
标签名：bean
属性：
id: userDao
class: com.bailiban.day1.helloworld.dao.impl.UserDaoImpl
标签名：bean
属性：
id: userService
class: com.bailiban.day1.helloworld.service.impl.UserServiceImpl
子标签：
标签名：property
属性：
name: userDao
ref: userDao
标签名：bean
属性：
id: client
class: com.bailiban.day1.helloworld.Client
子标签：
标签名：property
属性：
name: userService
ref: userService