java dom4j xml生成,解析

package com.test.dom;

import java.io.FileOutputStream;
import java.io.IOException;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

public class Dom4jDemo {

public static void main(String[] args) throws IOException {
Document doc = DocumentHelper.createDocument();
Element root = DocumentHelper.createElement("books");

doc.setRootElement(root);
root.addAttribute("id", "001");
Element bookElement = root.addElement("book");
Element titleElement = bookElement.addElement("title");
titleElement.setText("Harry Potter");

Element authorElement = bookElement.addElement("author");
authorElement.setText("J K. Rowling");

// 输出到控制台中
XMLWriter xmlWriter = new XMLWriter();
xmlWriter.write(doc);

// 把生成的xml文档存放在硬盘上 true代表是否换行
OutputFormat format = new OutputFormat("    ", true);
format.setEncoding("GBK");// 设置编码格式
XMLWriter fileXmlWriter = new XMLWriter(new FileOutputStream("e:/books.xml"), format);

fileXmlWriter.write(doc);
fileXmlWriter.close();
}
}

<?xml version="1.0" encoding="GBK"?>
<books id="001">
<book>
<title>Harry Potter</title>
<author>J K. Rowling</author>
</book>
</books>

String xmlStr = "<books>......</books>";
Document document = DocumentHelper.parseText(xmlStr);

//创建SAXReader对象
SAXReader reader = new SAXReader();
//读取文件 转换成Document
Document document = reader.read(new File("books.xml"));