java处理XML文件4种方式——JDOM处理XML

package com.imooc.jdomtest;

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

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

import com.imooc.entity.Book;

public class JDOMTest {
 private static ArrayList<Book> booksList = new ArrayList<Book>();
 /**
  * @param args
  */
 public static void main(String[] args) {
  // 进行对books.xml文件的JDOM解析
  // 准备工作
  // 1.创建一个SAXBuilder的对象
  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("src/res/books.xml");
   InputStreamReader isr = new InputStreamReader(in, "UTF-8");
   // 3.通过saxBuilder的build方法，将输入流加载到saxBuilder中
   Document document = saxBuilder.build(isr);
   // 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();
   // 继续进行解析
   for (Element book : bookList) {
    Book bookEntity = new Book();
    System.out.println("======开始解析第" + (bookList.indexOf(book) + 1)
      + "书======");
    // 解析book的属性集合
    List<Attribute> attrList = book.getAttributes();
    // //知道节点下属性名称时，获取节点值
    // book.getAttributeValue("id");
    // 遍历attrList(针对不清楚book节点下属性的名字及数量)
    for (Attribute attr : attrList) {
     // 获取属性名
     String attrName = attr.getName();
     // 获取属性值
     String attrValue = attr.getValue();
     System.out.println("属性名：" + attrName + "----属性值："
       + attrValue);
     if (attrName.equals("id")) {
      bookEntity.setId(attrValue);
     }
    }
    // 对book节点的子节点的节点名以及节点值的遍历
    List<Element> bookChilds = book.getChildren();
    for (Element child : bookChilds) {
     System.out.println("节点名：" + child.getName() + "----节点值："
       + child.getValue());
     if (child.getName().equals("name")) {
      bookEntity.setName(child.getValue());
     }
     else if (child.getName().equals("author")) {
      bookEntity.setAuthor(child.getValue());
     }
     else if (child.getName().equals("year")) {
      bookEntity.setYear(child.getValue());
     }
     else if (child.getName().equals("price")) {
      bookEntity.setPrice(child.getValue());
     }
     else if (child.getName().equals("language")) {
      bookEntity.setLanguage(child.getValue());
     }
    }
    System.out.println("======结束解析第" + (bookList.indexOf(book) + 1)
      + "书======");
    booksList.add(bookEntity);
    bookEntity = null;
    System.out.println(booksList.size());
    System.out.println(booksList.get(0).getId());
    System.out.println(booksList.get(0).getName());
    
   }
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (JDOMException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
 }

}