java--xml文件读取(JDOM&DOM4J)

package com.imooc_xml.jdom.text;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;

import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.JDOMException;
import org.jdom2.input.SAXBuilder;

public class JDOMTest {

    public static void main(String[] args) {
        
//        1、创建一个SAXBuilder对象
        SAXBuilder  saxBuilder = new SAXBuilder();
        InputStream in ;
        try {
//            2、创建一个输入流，将xml文件加载到输入流中
            in = new FileInputStream("xml/books.xml");
//            3、通过saxBuilder的build方法，将输入流加载到saxBuilder中
            Document document = saxBuilder.build(in);
//            4、通过document对象获取xml文件的根节点
            Element rootElement = document.getRootElement();
//            5、获取根节点下的子节点的list集合
            List<Element> bookList = rootElement.getChildren();
            
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }catch (JDOMException | IOException e) {
            e.printStackTrace();
        }
    }
}

    for (Element book:bookList){
                System.out.println("开始解析第"+(bookList.indexOf(book)+1)+"本书");
                List<Attribute> attrList = book.getAttributes();
                for (Attribute attr : attrList){
                    attr.getName();
                    attr.getValue();
                }
                //book.getAttributeValue("id");
                
                List<Element> bookChildren = book.getChildren();
                for(Element children : bookChildren){
                    children.getName();
                    children.getValue();
                }
            }

private static ArrayList<Book> bookList = new ArrayList<Book>();

//进行进一步解析
            for (Element book:bookList){
                Book bookEntity = new Book();


for (Attribute attr : attrList){
                    String attrName = attr.getName();
                    String attrValue = attr.getValue();
                    if(attrName.equals("id")){
                        bookEntity.setId(attrValue);
                    }
                }


for(Element children : bookChildren){
                    String name = children.getName();
                    String value = children.getValue();
                    if(name.equals("name")){
                        bookEntity.setName(value);
                    }else if(name.equals("author")){
                        bookEntity.setAuthor(value);
                    }else if(name.equals("year")){
                        bookEntity.setYear(value);
                    }else if(name.equals("price")){
                        bookEntity.setPrice(value);
                    }else if(name.equals("language")){
                        bookEntity.setLanguage(value);
                    }
                }
                JDOMTest.bookList.add(bookEntity);
                bookEntity=null;

package com.imooc_xml.dom4j.test;

import java.io.File;
import java.util.Iterator;
import java.util.List;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

public class DOM4JTest {

    public static void main(String[] args) {

        SAXReader reader = new SAXReader();
        try {
            Document document = reader.read(new File("xml/books.xml"));
            Element bookstore = document.getRootElement();
            Iterator it = bookstore.elementIterator();
            while (it.hasNext()) {
                Element book = (Element) it.next();
                List<Attribute> bookAttrs = book.attributes();
                for(Attribute attr : bookAttrs){
                    attr.getName();
                    attr.getValue();
                }
                Iterator itt = book.elementIterator();
                while (itt.hasNext()) {
                    Element bookChild = (Element) itt.next();
                    bookChild.getName();
                    bookChild.getStringValue();
                }
            }
        } catch (DocumentException e) {
            e.printStackTrace();
        }
    }
}

@Test
 public void testPerformance() throws Exception{
　　　　 long start = System.currentTimeMillis();
        //测试方法的性能
        long end = System.currentTimeMillis();
        
        System.out.println(start-end);