DOM4J读取XML

 依赖的jar包：

dom4j-1.6.1.jar 和 jaxen-1.1.6.jar

实现读取XML元素和添加元素

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package cn.test;   import java.io.FileOutputStream; import java.io.OutputStreamWriter;   import org.dom4j.Document; import org.dom4j.DocumentException; import org.dom4j.Element; import org.dom4j.io.OutputFormat; import org.dom4j.io.SAXReader; import org.dom4j.io.XMLWriter; import org.junit.Test;   /**  * 需要两个jar包  * dom4j-1.6.1.jar－306 KB  * jaxen-1.1-beta-6.jar  * @author zy  *  */   public class Dom4jTest {           @Test     public void readXML(){         String path = "D:/Temp/users.xml";         //创建解析器         SAXReader reader = new SAXReader();         try {             //得到document             Document doc = reader.read(path);             //通过xpath查询得到Element             Element ele = (Element) doc.selectSingleNode(                     "//user[@username='scott']");             //获取该元素的名为username的属性值             String username = ele.attributeValue("username");             String password = ele.attributeValue("password");             System.out.println(username+","+password);         } catch (DocumentException e) {             e.printStackTrace();         }     }           @Test     public void writeXML(){         String path = "D:/Temp/users.xml";         //创建解析器                 SAXReader reader = new SAXReader();                 try {                     //得到document                     Document doc = reader.read(path);                     //得到根元素                     Element root = doc.getRootElement();                     //通过根元素创建新元素user                     Element userEle = root.addElement("user");                     //为userEle设置属性                     userEle.addAttribute("username","scott");                     userEle.addAttribute("password","tiger");                     //设置文档格式，使用\t缩进，使用换行                     OutputFormat format = new OutputFormat("\t",true);                     //删除原来已有的文档的缩进和换行                     format.setTrimText(true);                     //创建XMLWriter                     XMLWriter writer;                     try {                          writer = new XMLWriter(                           new OutputStreamWriter(                                   new FileOutputStream(path),"utf-8"),format);                     //保存document对象                         writer.write(doc);                         writer.close();                     } catch (Exception e) {                         e.printStackTrace();                     }                 } catch (DocumentException e) {                     e.printStackTrace();                 }     }   }

　　

xml

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<?xml version="1.0" encoding="UTF-8"?>   <users>     <user username="scott" password="tiger"/> </users>