Java - 使用DOM解析xml(Java - Parsing xml using DOM)

 我试图解析以下的xml。 我可以轻松访问WeekNumber但无法访问EmployeeRatesLevelA和EmployeeRatesLevelB的子项。 目标是将这些保存到具有字段WeekNumber和ArrayLists，EmployeeRatesLevelA和EmployeeRatesLevelB的类DataSet。 谢谢。 
 
<DataSet ActiveFrom="2011/04/06">  
    <WeekNumber>8</WeekNumber>  
    <EmployeeRatesLevelA>  
        <Rate>0</Rate>  
        <Rate>0.12</Rate>  
    </EmployeeRatesLevelA>  
    <EmployeeRatesLevelB>  
        <Rate>0.15</Rate>  
        <Rate>0.20</Rate>  
    </EmployeeRatesLevelB>  
</DataSet>  


    Document doc = loadXml("data.xml");  
    NodeList nodeList = doc.getElementsByTagName("DataSet");  
    for (int i = 0; i < nodeList.getLength(); i++) {  
        Node node = nodeList.item(i);  
        if (node.getNodeType() == Node.ELEMENT_NODE) {  
            Element element = (Element) node;  
            NodeList weekNumberList = element.getElementsByTagName("WeekNumber");  
            Element weekElement = (Element) weekNumberList.item(0);  
            NodeList textElementList = weekElement.getChildNodes();
            System.out.println("Weeknumber:"+ ((Node)textElementList.item(0)).getNodeValue().trim());
    }

    public static Document loadXml(String file) {
        try {
           return (DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new File(file)));
        } catch (SAXException e) {
        e.printStackTrace();
        } catch (IOException e) {
        e.printStackTrace();
        } catch (ParserConfigurationException e) {
        e.printStackTrace();
        }
        return null;
    }
 
 这给了我Weeknumber但我无法访问EmployeeRatesLevelA和EmployeeRatesLevelB。 
 
 想学习其他很酷的东西但是因为我是Java新手并且xml文档非常小，DOM应该足够了。 

I am trying to parse the following xml. I can access the WeekNumber easily but cannot access the children for EmployeeRatesLevelA and EmployeeRatesLevelB. The goal is to save these to a class, DataSet with fields WeekNumber and ArrayLists, EmployeeRatesLevelA and EmployeeRatesLevelB. Thanks.
 
<DataSet ActiveFrom="2011/04/06">  
    <WeekNumber>8</WeekNumber>  
    <EmployeeRatesLevelA>  
        <Rate>0</Rate>  
        <Rate>0.12</Rate>  
    </EmployeeRatesLevelA>  
    <EmployeeRatesLevelB>  
        <Rate>0.15</Rate>  
        <Rate>0.20</Rate>  
    </EmployeeRatesLevelB>  
</DataSet>  


    Document doc = loadXml("data.xml");  
    NodeList nodeList = doc.getElementsByTagName("DataSet");  
    for (int i = 0; i < nodeList.getLength(); i++) {  
        Node node = nodeList.item(i);  
        if (node.getNodeType() == Node.ELEMENT_NODE) {  
            Element element = (Element) node;  
            NodeList weekNumberList = element.getElementsByTagName("WeekNumber");  
            Element weekElement = (Element) weekNumberList.item(0);  
            NodeList textElementList = weekElement.getChildNodes();
            System.out.println("Weeknumber:"+ ((Node)textElementList.item(0)).getNodeValue().trim());
    }

    public static Document loadXml(String file) {
        try {
           return (DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new File(file)));
        } catch (SAXException e) {
        e.printStackTrace();
        } catch (IOException e) {
        e.printStackTrace();
        } catch (ParserConfigurationException e) {
        e.printStackTrace();
        }
        return null;
    }
 
This gives me the Weeknumber but I am unable to access EmployeeRatesLevelA and EmployeeRatesLevelB.
 
Would like to learn other cool stuff but as I am new to Java and the xml document is really small, DOM should suffice.

原文：https://stackoverflow.com/questions/8345529