Dom4j解析XML

package  sjtu.rfid;

import  java.io.File;

import  org.dom4j.Document;
import  org.dom4j.DocumentException;
import  org.dom4j.Element;
import  org.dom4j.io.SAXReader;

public   class  ParserXML {
     public   void  Parser(File inputXml){
         try {
            SAXReader saxReader  =   new  SAXReader();
            Document document  =  saxReader.read(inputXml);
            
            Element root  =  document.getRootElement();
            
            System.out.println(root.element( " username " ).getText());
            System.out.println(root.element( " password " ).getText());
            
        } catch (DocumentException e){
            e.printStackTrace();
        }
    }
    
     public   static   void  main(String[] args){
        ParserXML parser  =   new  ParserXML();
        parser.Parser( new  File( " config.xml " ));
    }
}

package  sjtu.rfid;

import  java.io.File;
import  java.io.FileWriter;
import  java.io.IOException;

import  org.dom4j.Document;
import  org.dom4j.DocumentHelper;
import  org.dom4j.Element;
import  org.dom4j.io.XMLWriter;

public   class  CreateXML {

     public   void  createXML(){
        Document document  =  DocumentHelper.createDocument();
        
        Element configElement  =  document.addElement( " config " );
        configElement.addComment( " This is my configueration. " );
        
        Element usernameElement  =  configElement.addElement( " username " );
        Element passwordElement  =  configElement.addElement( " password " );
        
        usernameElement.addAttribute( " id " ,  " 97 " );
        
        usernameElement.setText( " Eric " );
        passwordElement.setText( " 1234 " );
        
         try  {
            XMLWriter output  =   new  XMLWriter( new  FileWriter( new  File(
                     " d:/config.xml " )));
            output.write(document);
            output.close();
        }  catch  (IOException e) {
            System.out.println(e.getMessage());
        }
    }
    
     public   static   void  main(String[] args) {
        CreateXML create  =   new  CreateXML();
        create.createXML();
    }

}

Nested exception
XML格式错误