java对xml节点属性的增删改查实现方法

package vastsum;import java.io.File;
import java.io.FileWriter;
import java.util.Iterator;import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import org.junit.Test;/**
* 使用dom4j操作xml
* 对xml属性操作
* 时间：2016年10月2号
* 操作xml文件为contact.xml
* 本文件文件名为：attrDemo.java
* @author shutu008
*
*/
public class attrDemo{
@Test
public void exmple() throws Exception{
//读取XML文件，获得document对象
SAXReader reader = new SAXReader();
Document document = reader.read(new File("./src/contact.xml")); //获得某个节点的属性对象
Element rootElem = document.getRootElement();
//获取根节点属性对象
Attribute rootAttr = rootElem.attribute("id"); //获取指定节点属性对象
Element contactElem = rootElem.element("contact");
Attribute contactAttr = contactElem.attribute("id"); //遍历某个节点的所有属性
for (Iterator it = contactElem.attributeIterator();it.hasNext();){
Attribute conAttr= (Attribute)it.next();
String conTxt = conAttr.getValue();
String conAttrName = conAttr.getName();
System.out.println(conAttrName+" = "+conTxt);
}
//设置某节点的属性和值
contactElem.addAttribute("name", "zhangsan"); //设置(更改)某属性的值
Attribute nameAttr = contactElem.attribute("name");
nameAttr.setValue("lisi"); //删除某节点的指定属性
contactElem.remove(nameAttr);
//将某节点的属性和值写入xml文档中
XMLWriter writer = new XMLWriter(new FileWriter("./src/contact.xml"));
writer.write(document);
writer.close(); /**
* 如果文档中有中文需要设置字符编码
* 用如下语句:
* OutputFormat format = OutputFormat.createPrettyPrint();
* format.setEncoding("GBK");
* XMLWriter writer = new XMLWriter(new FileWriter("./src/contact.xml"),format);
*/
//获取指定对象的属性名
System.out.println(rootAttr.getName());
System.out.println(contactAttr.getName());
//获取指定对象的属性值
System.out.println(contactAttr.getValue());
System.out.println(rootAttr.getValue());
}
}

<?xml version="1.0" encoding="UTF-8"?>
<contactList id="0">
<contact id="001" class="style">
<name>张三</name>
<age>20</age>
<phone>134222223333</phone>
<email>zhangsan@qq.com</email>
<qq>432221111</qq>
</contact>
<contact id="002">
<name>李四</name>
<age>20</age>
<phone>134222225555</phone>
<email>lisi@qq.com</email>
<qq>432222222</qq>
</contact>
<contactTwo>
<name>王五</name>
<age>32</age>
<phone>465431341</phone>
<emali>af@qq.com</emali>
<qq>46164694</qq>
</contactTwo>
<test>测试</test>
<test>其他用途</test>
</contactList>