使用dom4j创建和解析xml

package xml;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import java.util.Iterator;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

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

public class TestXml {

public static void main(String[] args) {
createXml("E:/test/human.xml");

try {
readXml("E:/test/human.xml");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

/**
* 创建Xml文件
*
* @param fileName
* @return
*/
public static void createXml(String fileName) {
//		 // 第一种方式：创建文档，并创建根元素
//		 // 创建文档:使用了一个Helper类
//		 Document document = DocumentHelper.createDocument();
//		 // 创建根节点并添加进文档
//		 Element root = DocumentHelper.createElement("human");
//		 document.setRootElement(root);

// 第二种方式:创建文档并设置文档的根元素节点
Element root = DocumentHelper.createElement("human");
Document document = DocumentHelper.createDocument(root);

Element name = root.addElement("name");// 添加节点name
name.setText("张三");// 赋值
name.addAttribute("a1", "123");// 添加属性a1，并赋值
Element sex = root.addElement("sex");
sex.setText("男");

try {// 写入文件
// 格式
OutputFormat format = new OutputFormat("    ", true);// 设置缩进为4个空格，并且另起一行为true
Writer fileWriter = new FileWriter(fileName);
XMLWriter xmlWriter = new XMLWriter(fileWriter, format);
xmlWriter.write(document); // 写入文件中
xmlWriter.close();
} catch (IOException e) {
System.out.println(e.getMessage());
}

}

/**
* 解析Xml
*
* @param fileName
*/
public static void readXml(String fileName) throws Exception {
SAXReader saxReader = new SAXReader();
Document document = saxReader.read(new File("E:/test/human.xml"));
// 获取根元素
Element root = document.getRootElement();
System.out.println("Root: " + root.getName());
// 获取所有子元素
List<Element> childList = root.elements();
System.out.println("total child count: " + childList.size());
// 获取特定名称的子元素
List<Element> childList2 = root.elements("name");
System.out.println("name child: " + childList2.size());

// 获取名字为指定名称的第一个子元素
Element firstWorldElement = root.element("name");
// 输出其属性
System.out.println("first World Attr: "
+ firstWorldElement.attribute(0).getName() + "="
+ firstWorldElement.attributeValue("a1"));

System.out.println("迭代输出-----------------------");
// 迭代输出
for (Iterator iter = root.elementIterator(); iter.hasNext();) {
Element e = (Element) iter.next();
System.out.println(e.getText());

}

System.out.println("用DOMReader-----------------------");
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
// 注意要用完整类名
org.w3c.dom.Document document2 = db.parse(new File("E:/test/human.xml "));

DOMReader domReader = new DOMReader();

// 将JAXP的Document转换为dom4j的Document
Document document3 = domReader.read(document2);

Element rootElement = document3.getRootElement();

System.out.println("Root: " + rootElement.getName());
}

}