獲取XML節點的子元素值

Question

我有一個XML，如： -

<SkillMap> 
    <ExitPoint ID="01"> 
    <NodeName>abcd</NodeName> 
    </ExitPoint> 
    <ExitPoint ID="04"> 
    <NodeName>defg</NodeName> 
    </ExitPoint> 
    <ExitPoint ID="22"> 
    <NodeName>mnop</NodeName> 
    </ExitPoint> 
    </SkillMap> 

我試圖讓<ExitPoint>節點的基礎上，即如果我輸入ID值的值ID爲01應該給「abcd」，如果22應該給「mnop」等，但我沒有得到它，試了很多，請幫助。

感謝， 人工魚礁

Answer 1

可以使用Xpath做到這一點，可考慮從JAXP Specification 1.4採取下面的例子（我建議你爲這個諮詢）：

// parse the XML as a W3C Document 
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder(); 
org.w3c.Document document = builder.parse(new File("/widgets.xml")); 
// evaluate the XPath expression against the Document 
XPath xpath = XPathFactory.newInstance().newXPath(); 
String expression = "/widgets/widget[@name='a']/@quantity"; 
Double quantity = (Double) xpath.evaluate(expression, document, XPathConstants.NUMBER);