獲取數據

Question

這裏是我的代碼：

void validate(String fileLocation){ 
    try{ 
     DocumentBuilderFactory factory= DocumentBuilderFactory.newInstance(); 
     DocumentBuilder builder = factory.newDocumentBuilder(); 
     Document document = builder.parse(new File(fileLocation)); 
     String[] pageContent=new String[100]; 
     for (int i = 0; i < pageContent.length; i++) { 
      String currentPageContent= document.getElementsByTagName("?PG").item(i).getTextContent(); 
      System.out.println("the Current Page content is "+currentPageContent); 
      pageContent[i]=currentPageContent; 
     } 
    }catch(Exception e){ 
     e.printStackTrace(); 
    } 
} 

我有幾個標籤爲< PG 1>，< PG 2>，< PG 3>表示頁？？？？？？數字我怎麼能從頁面標籤獲取數據。

Answer 1

1. 您可以使用遞歸走在你不xml凌亂嵌套for循環。
2. 您可以比較節點類型爲PROCESSING_INSTRUCTION_NODE並提取其內容。

示例XML：

<?xml version="1.0" encoding="UTF-8" ?> 
<test> 
    <ID>Test1</ID> 
    <TestType name="abc"> 
    <AddressRange start="0x00000000" end="0x0018ffff" /> 
    </TestType > 
    <TestType name="RAM"> 
    <AddressRange start="0x00400000" end="0x00407fff" /> 
    </TestType > 
    <?PITarget PIContent?> 
    <?PISource PISome?> 
</test> 

代碼：

public static void main(String[] args) throws ParserConfigurationException, 
      SAXException, IOException { 
     FileInputStream path = new FileInputStream("text.xml"); 
     DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); 
     DocumentBuilder builder = factory.newDocumentBuilder(); 
     Document document = builder.parse(path); 
     System.out.println(); 
     traverse(document.getDocumentElement()); 

    } 

    public static void traverse(Node node) { 
     NodeList list = node.getChildNodes(); 
     for (int i = 0; i < list.getLength(); i++) { 
      Node currentNode = list.item(i); 
      traverse(currentNode); 

     } 

     if (node.getNodeType() == Node.PROCESSING_INSTRUCTION_NODE) { 
      System.out.println("This -> " + node.getTextContent()); 
     } 

    } 

給人，

This -> PIContent 
This -> PISome 

Answer 2

如果你想在你的代碼讀取Processing Instructions比你應該做這樣的事情：

 NodeList currentPageContent= document.getChildNodes(); 
     for (int i = 0; i < currentPageContent.getLength(); i++) { 
      Node node = currentPageContent.item(i); 
      if(node.getNodeType()==Node.PROCESSING_INSTRUCTION_NODE) 
       System.out.println("the Current Page content is "+ node.getNodeType()+ " : " + node.getNodeName() + " : " + node.getTextContent()); 
     } 

希望這會有所幫助。

Answer 3

處理指令被暴露在DOM（d ocument ö bject 中號 Odel等）作爲Node.PROCESSING_INSTRUCTION_NODE。