dom读取xml文件的问题

Question

我有一个xml文件：



deltaQuery="select Uid from User where lastmodify > '${dataimporter.last_index_time}'">











该xml文件没有<?xml...>等标签

我想读取出dataSource标签中driver url等值，写了一个类如下：
File file = new File("data_config.xml");

    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

    DocumentBuilder builder=dbf.newDocumentBuilder();

    Document doc=builder.parse(file);

    NodeList dataSource = doc.getElementsByTagName("dataSource");

    System.out.println(dataSource.getLength());
    for(int i=0;i<dataSource.getLength();i++)
    {
        Node node=dataSource.item(i);
        System.out.println(node);
        System.out.println(node.getNodeValue());
    }

总是说读到的null。
求大牛指正。

另外：我想读取所有filed下的column 和name标签的值，该怎么写呢？

Answer 1

File file = new File("data_config.xml");

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

DocumentBuilder builder=dbf.newDocumentBuilder();

Document doc=builder.parse(file);

[color=red]//获取文档的根元素，赋值给rootElement变量

Element rootElement = document.getDocumentElement();

NodeList dataSource = rootElement.getElementsByTagName("dataSource"); [/color]

System.out.println(dataSource.getLength());
for(int i=0;i<dataSource.getLength();i++)
{
Node node=dataSource.item(i);
System.out.println(node);
System.out.println(node.getNodeValue());
}