一個用Dom4j解析xml的例子

一、測試用的em.xml
<?xml version="1.0" encoding="GB2312"?>
 <EW cmd="login" mod="Login" version="6.0">
   <Source uns="" type="user"/>
   <Username>zhangzhiyun@hp</Username>
   <Password>111111</Password>
  <Version>6.01.06.00</Version>
</EW>

 

二、Dom4jTest.java

 import java.io.BufferedReader;
 import java.io.BufferedWriter;
 import java.io.File;
 import java.io.FileReader;
 import java.io.FileWriter;
 import java.io.IOException;
 import org.apache.log4j.Logger;
 import org.dom4j.Attribute;
 import org.dom4j.DocumentException;
 import org.dom4j.DocumentHelper;
 import org.dom4j.Element;
 /**
  * @author julysea
  *
  * 一個用Dom4j解析xml的例子
  *
  */
 public class Dom4jTest {
   private static final Logger logger = Logger.getLogger(Dom4jTest.class);
    public static void main(String[] args) throws IOException,
       DocumentException {
         BufferedReader reader=new BufferedReader(new FileReader("ew.xml"));
         String tempStr;
         String ewXml="";
         while((tempStr=reader.readLine())!=null) {
             ewXml=ewXml+tempStr;
             logger.debug(tempStr);
         }
        Element root = null;
         root = DocumentHelper.parseText(ewXml).getRootElement();
         Attribute rootCmd=root.attribute("cmd");
         Attribute rootVersion=root.attribute("version");
         logger.debug("rootNmae = "+root.getName());
         logger.debug("EW'cmd = "+rootCmd.getValue());
         logger.debug("EW'version = "+rootVersion.getValue());
         Element usrName=root.element("Username");
         logger.debug("EW.Username value = "+usrName.getTextTrim());
         Element source=root.element("Source");
         Attribute sourceUns=source.attribute("uns");
         logger.debug("EW.Source'uns＝"+sourceUns.getValue());
         Attribute sourceType=source.attribute("type");
         logger.debug("EW.Source'type = "+sourceType.getValue());
        //創建一個Xml文件
        Element user=DocumentHelper.createElement("User");
        user.addAttribute("type", "user");
        user.addElement("name").addAttribute("type", "PinYin").setText("Julysea");
        user.addElement("age").setText("29");
        String oneXml=user.asXML();
        
        BufferedWriter out=new BufferedWriter(new FileWriter("oneXml.xml"));
         out.write(oneXml);
         out.close();
     }
 }

 

三、運行：將log4j.properties文件與Dom4jTest.java放同一目錄下編譯運行，以下是輸出結果：
log4e.log文件內容：

2006-04-04 09:16:13,363 [main] DEBUG Dom4jTest - <?xml version="1.0" encoding="GB2312"?>
2006-04-04 09:16:13,373 [main] DEBUG Dom4jTest - <EW cmd="login" mod="Login" version="6.0">
2006-04-04 09:16:13,373 [main] DEBUG Dom4jTest - 　 <Source uns="" type="user"/>
2006-04-04 09:16:13,373 [main] DEBUG Dom4jTest - 　 <Username>zhangzhiyun@hp</Username>
2006-04-04 09:16:13,373 [main] DEBUG Dom4jTest - 　 <Password>111111</Password>
2006-04-04 09:16:13,373 [main] DEBUG Dom4jTest - 　 <Version>6.01.06.00</Version>
2006-04-04 09:16:13,373 [main] DEBUG Dom4jTest - </EW>
2006-04-04 09:16:13,594 [main] DEBUG Dom4jTest - rootNmae = EW
2006-04-04 09:16:13,594 [main] DEBUG Dom4jTest - EW'cmd = login
2006-04-04 09:16:13,594 [main] DEBUG Dom4jTest - EW'version = 6.0
2006-04-04 09:16:13,594 [main] DEBUG Dom4jTest - EW.Username value = zhangzhiyun@hp
2006-04-04 09:16:13,594 [main] DEBUG Dom4jTest - EW.Source'uns＝
2006-04-04 09:16:13,594 [main] DEBUG Dom4jTest - EW.Source'type = user

oneXml.xml的內容：

<User type="user"><name type="PinYin">Julysea</name><age>29</age></User>

四、log4j日誌配置文件：log4j.properties

log4j.rootCategory=ConApp, FileApp
# ConApp is set to be a ConsoleAppender.
log4j.appender.ConApp=org.apache.log4j.ConsoleAppender
log4j.appender.ConApp.Target=System.out
log4j.appender.ConApp.layout=org.apache.log4j.PatternLayout
log4j.appender.ConApp.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
# FileApp
log4j.appender.FileApp=org.apache.log4j.RollingFileAppender
log4j.appender.FileApp.File=./log4e.log
log4j.appender.FileApp.MaxFileSize=500KB
# Keep one backup file
log4j.appender.FileApp.MaxBackupIndex=1
log4j.appender.FileApp.layout=org.apache.log4j.PatternLayout
log4j.appender.FileApp.layout.ConversionPattern=%d [%t] %-5p %c - %m%n