setNamespaceContext用于默认名称空间 [英] setNamespaceContext for default namespace

问题描述

我有如下的xml.

addnumber,firstnumber,secondnumber

XML:

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Body>
<addnumber xmlns="http://september.examples.com/">
<firstnumber>10</firstnumber>
<secondnumber>22</secondnumber>
</addnumber>
</soapenv:Body>
</soapenv:Envelope>

当我尝试使用以下代码从Xpath获取价值

When I try to get value from Xpath using the following code

        factory.setNamespaceAware(true);
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document document = builder.parse(new InputSource(new StringReader(xml)));
        XPathFactory xpathFactory = XPathFactory.newInstance();
        XPath xpath = xpathFactory.newXPath();
        xpath.setNamespaceContext(createContext(xml));
        String value = xpath.compile("/soapenv:Envelope[1]/soapenv:Body[1]/addnumber[1]/firstnumber[1]").evaluate(document).toString();

我得到的是空值.由于我在此处给出的Xpath是addnumber [1]/firstnumber [1]的空名称空间，我该如何赋予默认名称空间的xpath?

I'm geting empty value. Since the Xpath I have given here is empty namespace of addnumber[1]/firstnumber[1] How can I give xpath of default namespace?

注意:createContext()将创建一个包含前缀URI的地图

Note:createContext() will crate a map which would contain prefix, URI

推荐答案

您可以使用任何前缀来表示默认名称空间，只要它指向相同的uri.只需在其中添加指向默认名称空间uri( http://september.examples.com/)的前缀即可.函数createContext()，并在XPath表达式中使用它.

You can use any prefix to represent default namespace, as long as it points to the same uri. Simply add another prefix pointing to default namespace uri (http://september.examples.com/) in the function createContext(), and use it in XPath expression.

相关问题: https://stackoverflow.com/a/6392700/2998271

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