相关疑难解决方法(0)

我有一个xml文件调用data.xml,如下面的代码.项目可以从客户端运行没问题,它可以读取xml文件.我现在遇到的问题是我想编写一个可以更新startdate和enddate的函数.我不知道如何开始.帮助将不胜感激.

  <?xml version="1.0" encoding="UTF-8" standalone="no"?>
<data>
       <username>admin</username>
       <password>12345</password>
       <interval>1</interval>
       <timeout>90</timeout>
       <startdate>01/01/2013</startdate>
       <enddate>06/01/2013</enddate>
       <ttime>1110</ttime>
    </data>

我的main.java

    public class main
    {
     public static void main(String[] args) 
      {
          Calendar cal2 =null;

    try {   

              //read the xml      
              File data = new File("data.xml");  
              DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();         
              DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();           
              Document doc = dBuilder.parse(data);         
              doc.getDocumentElement().normalize();

     for (int i = 0; i < nodes.getLength(); i++) {     
              Node node = nodes.item(i);           
                if (node.getNodeType() == Node.ELEMENT_NODE) {     
                    Element element = (Element) node;   
                    username = getValue("username", element);
                    startdate …