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());
 }
}

以下是XML文档：

<?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>

文件目录如图所示