dom4j for XML parsing

1. Parse XML using dom4j technology

public class Dom4jTest {
    public static void main(String[] args) {
        //1.创建SAXReader对象
        SAXReader saxReader=new SAXReader();

        try {
             // 2. Load the book.xml file through the SAXReader object and get the Document object 
            Document document = saxReader.read( new File("/home/yaming/Desktop/workspace/javatech-parent/xml/src/main/resources/ books.xml" ));
             // 3. Get the root node Element through the getRootElement method 
            bookStore =   document.getRootElement();
             // 4. Get the iterator (the first level child node of the root node) through elementIterator 
            Iterator iterator= bookStore. elementIterator();
             // 5. Traverse the iterator to get the information under the root node (child nodes of the root node) 
            while (iterator.hasNext()){
                System.out.println( "------------Start traversing a certain book---------" );
                Element book = (Element) iterator.next(); // Force type conversion
                 // (1). Get the attribute name and attribute value of the book through attributes (child nodes under child nodes) 
                List<Attribute> bookAttrs= book.attributes ();
                 for (Attribute attr:bookAttrs){
                     // Get attribute name 
                    String name= attr.getName();
                     // Get attribute value 
                    String value= attr.getValue();
                    System.out.println( "Property name: "+name+" Property value: "+ value);
                }

                // (2). Get the node name and node value of the child node of the book node through elementIterator 
                Iterator it= book.elementIterator();
                 while (it.hasNext()){
                    Element bookChild = (Element) it.next();
                     // Get node name 
                    String name= bookChild.getName();
                     // Get node value 
                    String value= bookChild.getStringValue();
                    System.out.println( "Node name: "+name+"Node value: "+ value);
                }
                System.out.println( "------------Start traversing a certain book---------" );
            }
        } catch (DocumentException e) {
            e.printStackTrace ();
        }

    }
}

2. Description:

#1 . Introduce jar package
 < !-- https://mvnrepository.com/artifact/dom4j/dom4j -->
        <dependency>
            <groupId>dom4j</groupId>
            <artifactId>dom4j</artifactId>
            <version>1.6.1</version>
        </dependency> 
# 2. Programming
##1.
Create a SAXReader object
##2.
Load the book.xml file through the SAXReader object and get the Document object
##3.
Get the root node through the getRootElement method
##4.
Get the iterator (child nodes of the root node) through elementIterator
##5.
Traverse the iterator to get the information under the root node (child nodes of the root node)
####(1).
 Get the attribute name and attribute value of the book through attributes (the child node under the child node)
 ####(2)
 Get the node name and node value of the child node of the book node through elementIterator

3. Other technologies for parsing xml, dom, jdom, sax, etc. make up later

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