java访问xml文件

Java code

    
    
    
    

     
     
     
      
     
     
     
     import
     
     
     
      java.io.
     
     
     
     *
     
     
     
     ; 
     
     
     
     import
     
     
     
      javax.xml.parsers.DocumentBuilder; 
     
     
     
     import
     
     
     
      javax.xml.parsers.DocumentBuilderFactory; 
     
     
     
     import
     
     
     
      org.w3c.dom.Document; 
     
     
     
     import
     
     
     
      org.w3c.dom.Element; 
     
     
     
     import
     
     
     
      org.w3c.dom.Node; 
     
     
     
     import
     
     
     
      org.w3c.dom.NodeList; 
     
     
     
     public
     
     
     
      
     
     
     
     class
     
     
     
      xmljava { 
     
     
     
     public
     
     
     
      
     
     
     
     static
     
     
     
      
     
     
     
     void
     
     
     
      main(String args[]) { Element element
     
     
     
     =
     
     
     
     null
     
     
     
     ; File f 
     
     
     
     =
     
     
     
     new
     
     
     
      File(
     
     
     
     "
     
     
     
     a.xml
     
     
     
     "
     
     
     
     ); DocumentBuilder db
     
     
     
     =
     
     
     
     null
     
     
     
     ; 
     
     
     
     //
     
     
     
     documentBuilder为抽象不能直接实例化(将XML文件转换为DOM文件)
     
     
     
      
     
     
     
      DocumentBuilderFactory dbf
     
     
     
     =
     
     
     
     null
     
     
     
     ; 
     
     
     
     try
     
     
     
     { dbf
     
     
     
     =
     
     
     
      DocumentBuilderFactory.newInstance(); 
     
     
     
     //
     
     
     
     返回documentBuilderFactory对象 
     
     
     
      
     
     
     
      db 
     
     
     
     =
     
     
     
     dbf.newDocumentBuilder();
     
     
     
     //
     
     
     
     返回db对象用documentBuilderFatory对象获得返回documentBuildr对象
     
     
     
      
     
     
     
      Document dt
     
     
     
     =
     
     
     
      db.parse(f); 
     
     
     
     //
     
     
     
     得到一个DOM并返回给document对象
     
     
     
      
     
     
     
      element 
     
     
     
     =
     
     
     
      dt.getDocumentElement();
     
     
     
     //
     
     
     
     得到一个elment根元素
     
     
     
      
     
     
     
      System.out.println(
     
     
     
     "
     
     
     
     根元素：
     
     
     
     "
     
     
     
     +
     
     
     
     element.getNodeName()); 
     
     
     
     //
     
     
     
     获得根节点
     
     
     
      
     
     
     
      NodeList childNodes 
     
     
     
     =
     
     
     
     element.getChildNodes() ; 
     
     
     
     //
     
     
     
      获得根元素下的子节点
     
     
     
      
     
     
     
      
     
     
     
     for
     
     
     
      (
     
     
     
     int
     
     
     
      i 
     
     
     
     =
     
     
     
      
     
     
     
     0
     
     
     
     ; i 
     
     
     
     <
     
     
     
      childNodes.getLength(); i
     
     
     
     ++
     
     
     
     ) 
     
     
     
     //
     
     
     
      遍历这些子节点
     
     
     
      
     
     
     
      { Node node1 
     
     
     
     =
     
     
     
      childNodes.item(i); 
     
     
     
     //
     
     
     
      childNodes.item(i); 获得每个对应位置i的结点
     
     
     
      
     
     
     
      
     
     
     
     if
     
     
     
      (
     
     
     
     "
     
     
     
     Account
     
     
     
     "
     
     
     
     .equals(node1.getNodeName())) { 
     
     
     
     //
     
     
     
      如果节点的名称为"Account"，则输出Account元素属性type
     
     
     
      
     
     
     
      System.out.println(
     
     
     
     "
     
     
     
     \r\n找到一篇账号. 所属区域: 
     
     
     
     "
     
     
     
      
     
     
     
     +
     
     
     
      node1.getAttributes().getNamedItem (
     
     
     
     "
     
     
     
     type
     
     
     
     "
     
     
     
     ).getNodeValue() 
     
     
     
     +
     
     
     
      
     
     
     
     "
     
     
     
     . 
     
     
     
     "
     
     
     
     ); NodeList nodeDetail 
     
     
     
     =
     
     
     
      node1.getChildNodes(); 
     
     
     
     //
     
     
     
      获得<Accounts>下的节点
     
     
     
      
     
     
     
      
     
     
     
     for
     
     
     
      (
     
     
     
     int
     
     
     
      j 
     
     
     
     =
     
     
     
      
     
     
     
     0
     
     
     
     ; j 
     
     
     
     <
     
     
     
      nodeDetail.getLength(); j
     
     
     
     ++
     
     
     
     ) { 
     
     
     
     //
     
     
     
      遍历<Accounts>下的节点
     
     
     
      
     
     
     
      Node detail 
     
     
     
     =
     
     
     
      nodeDetail.item(j); 
     
     
     
     //
     
     
     
      获得<Accounts>元素每一个节点
     
     
     
      
     
     
     
      
     
     
     
     if
     
     
     
      (
     
     
     
     "
     
     
     
     code
     
     
     
     "
     
     
     
     .equals(detail.getNodeName())) 
     
     
     
     //
     
     
     
      输出code
     
     
     
      
     
     
     
      System.out.println(
     
     
     
     "
     
     
     
     卡号: 
     
     
     
     "
     
     
     
      
     
     
     
     +
     
     
     
      detail.getTextContent()); 
     
     
     
     else
     
     
     
      
     
     
     
     if
     
     
     
      (
     
     
     
     "
     
     
     
     pass
     
     
     
     "
     
     
     
     .equals(detail.getNodeName())) 
     
     
     
     //
     
     
     
      输出pass
     
     
     
      
     
     
     
      System.out.println(
     
     
     
     "
     
     
     
     密码: 
     
     
     
     "
     
     
     
      
     
     
     
     +
     
     
     
      detail.getTextContent()); 
     
     
     
     else
     
     
     
      
     
     
     
     if
     
     
     
      (
     
     
     
     "
     
     
     
     name
     
     
     
     "
     
     
     
     .equals(detail.getNodeName())) 
     
     
     
     //
     
     
     
      输出name
     
     
     
      
     
     
     
      System.out.println(
     
     
     
     "
     
     
     
     姓名: 
     
     
     
     "
     
     
     
      
     
     
     
     +
     
     
     
      detail.getTextContent()); 
     
     
     
     else
     
     
     
      
     
     
     
     if
     
     
     
      (
     
     
     
     "
     
     
     
     money
     
     
     
     "
     
     
     
     .equals(detail.getNodeName())) 
     
     
     
     //
     
     
     
      输出money
     
     
     
      
     
     
     
      System.out.println(
     
     
     
     "
     
     
     
     余额: 
     
     
     
     "
     
     
     
     +
     
     
     
      detail.getTextContent()); } } } } 
     
     
     
     catch
     
     
     
     (Exception e){System.out.println(e);} } } 
    
    
    
    

XML code

    
    
    
    

     
     
     
      
     
     
     
     <?
     
     
     
     xml version="1.0" encoding="gbk"
     
     
     
     ?>
     
     
     
      
     
     
     
     <
     
     
     
     Accounts
     
     
     
     >
     
     
     
      
     
     
     
     <
     
     
     
     Account 
     
     
     
     type
     
     
     
     ="by0003"
     
     
     
     >
     
     
     
      
     
     
     
     <
     
     
     
     code
     
     
     
     >
     
     
     
     100001
     
     
     
     </
     
     
     
     code
     
     
     
     >
     
     
     
      
     
     
     
     <
     
     
     
     pass
     
     
     
     >
     
     
     
     123
     
     
     
     </
     
     
     
     pass
     
     
     
     >
     
     
     
      
     
     
     
     <
     
     
     
     name
     
     
     
     >
     
     
     
     李四
     
     
     
     </
     
     
     
     name
     
     
     
     >
     
     
     
      
     
     
     
     <
     
     
     
     money
     
     
     
     >
     
     
     
     1000000.00
     
     
     
     </
     
     
     
     money
     
     
     
     >
     
     
     
      
     
     
     
     </
     
     
     
     Account
     
     
     
     >
     
     
     
      
     
     
     
     <
     
     
     
     Account 
     
     
     
     type
     
     
     
     ="hz0001"
     
     
     
     >
     
     
     
      
     
     
     
     <
     
     
     
     code
     
     
     
     >
     
     
     
     100002
     
     
     
     </
     
     
     
     code
     
     
     
     >
     
     
     
      
     
     
     
     <
     
     
     
     pass
     
     
     
     >
     
     
     
     123
     
     
     
     </
     
     
     
     pass
     
     
     
     >
     
     
     
      
     
     
     
     <
     
     
     
     name
     
     
     
     >
     
     
     
     张三
     
     
     
     </
     
     
     
     name
     
     
     
     >
     
     
     
      
     
     
     
     <
     
     
     
     money
     
     
     
     >
     
     
     
     1000.00
     
     
     
     </
     
     
     
     money
     
     
     
     >
     
     
     
      
     
     
     
     </
     
     
     
     Account
     
     
     
     >
     
     
     
      
     
     
     
     </
     
     
     
     Accounts
     
     
     
     >