Nodelist.item返回null

BElow是我讀取xml文件的主要代碼.System.out.println（node）在1.5和1.6中返回null。我發佈了一個示例程序來重現該bug。我的xml也是如此。具有相同代碼和xml的程序在jdk 1.4中工作正常。但在更改爲上述版本後，它將返回null。Nodelist.item返回null

public class Main 
{   
    private static Document document; 

    public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException 
    { 
     File xmlfile = new File("D:\\utility_1341173385278.xml"); 

     parseXMLFile(xmlfile); 
     getNodes(getRootNode(), "DIR"); 
    } 

    public static void parseXMLFile(File file) throws ParserConfigurationException, SAXException, IOException 
    { 
     DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); 
     DocumentBuilder db = dbf.newDocumentBuilder(); 
     document = db.parse(file); 
    } 

    // get root node in xml 

    public static Node getRootNode() 
    { 
     return document.getDocumentElement(); 
    } 

    // To get nodes in xml file starting from root node and prints all nodes which starts with given name..... 

    public static List getNodes(Node parent, String nodeName) 
    { 
     List newList = new ArrayList(); 

     NodeList list = parent.getChildNodes(); 
     if (list != null) 
     { 
      for (int i = 0; i < list.getLength(); i++) 
      { 
       Node node = list.item(i); 
       System.out.println(node); 
       if (node.getNodeName().equals(nodeName)) 
       { 
        newList.add(node); 
       } 
      } 
     } 

     list = null; 

     return newList; 
    } 
}

XML文件與DIR，數據庫和文件標籤

<?xml version="1.0" encoding="UTF-8" standalone="no"?> 
    <DATABASE data="" name="Test" path="file:/D:/Java/bu%2077/Test/utility/"> 
     <DIR last_mod_date="1341058205411" name="utility" status="unchanged"> 
      <DIR last_mod_date="1341058205445" name="bs90" status="unchanged"> 
       <DIR last_mod_date="1341058205699" name=".r280" status="unchanged"> 
        <DIR last_mod_date="1341058205756" name="0093" status="unchanged"> 
         <FILE last_mod_date="1340873680000" name="c2c1f5f1.000004b6" size="3360" status="unchanged"/> 
         <FILE last_mod_date="1340873680000" name="c7c1f0f1.00000cba" size="3440" status="unchanged"/> 
        </DIR> 
       </DIR> 
       <FILE last_mod_date="1340957268000" name="New Text Document.txt" size="5" status="unchanged"/> 
      </DIR> 
     </DIR> 
    </DATABASE>

我已經從1.4上執行這一點，1.5.Below是1.4

  <DIR last_mod_date="1341058205411" name="utility" status="unchanged"> 
       <DIR last_mod_date="1341058205445" name="bs90" status="unchanged"> 
        <DIR last_mod_date="1341058205699" name=".r280" status="unchanged"> 
         <DIR last_mod_date="1341058205756" name="0093" status="unchanged"> 
          <FILE last_mod_date="1340873680000" name="c2c1f5f1.000004b6" size="3360" status="unchanged"/> 
          <FILE last_mod_date="1340873680000" name="c7c1f0f1.00000cba" size="3440" status="unchanged"/> 
         </DIR> 
        </DIR> 
        <FILE last_mod_date="1340957268000" name="New Text Document.txt" size="5" status="unchanged"/> 
       </DIR> 
      </DIR> 


**************************************** 
output in 1.5 

[#text: 
    ] 
[DIR: null] 
[#text: 
] 
[#text: 
    ] 
[DIR: null] 
[#text: 
] 
[#text: 
     ]

來源

2012-07-25 Kittu

在哪裏異常拋出？請發佈堆棧跟蹤。 – aioobe 2012-07-25 06:06:27

輸出，使他們」已經改變了toString（）實現。你爲什麼依靠那個呢？

無論而是創建自己的節點包裝覆蓋的toString（）或讓你感興趣的物業

來源

2012-07-25 10:39:39 TedTrippin

做的：

Node node = list.item(i); 
System.out.println(node);

嘗試：

Element value = (Element) list.item(i); 
System.out.println(value.getTextContent());

來源

2013-06-20 21:46:32 Keren

這裏有一個錯字：'list.item（i）'而不是'list.itme（i）' – verybadalloc 2013-06-20 22:10:58

Nodelist.item返回null

回答

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