在JAVA中使用XPath解析具有不同名称空间的xml [英] Parsing xml that has different namespaces using XPath in JAVA

问题描述

我正在做这个小项目，我的任务是读取xml文件并进行解析，以便可以将其存储在类中. 这是xml示例.它是用SOAP编写的，我要做的就是获取

I'm doing this small project and my task was to read a xml file and parse it so that it can be stored in a class. Here's the xml example. it's written in SOAP and what I want to do is get

<ns2:getNewTokenResponse xmlns:ns2="http://abc.examples.com/">

这部分经过解析，并得到了子节点，因此我可以创建一个类，该类具有"nodeName"作为属性，其值为"getNewTokenResponse". +会话密钥

this part parsed and the child nodes so that I can create a class that has 'nodeName' as an attribute with a value of 'getNewTokenResponse'. +session key

<env:Envelope xmlns:env='http://schemas.xmlsoap.org/soap/envelope/'>
    <env:Header>
    </env:Header>
    <env:Body>
        <ns2:getNewTokenResponse xmlns:ns2="http://abc.examples.com/">
            <return>
                {{session.key}}
            </return>
        </ns2:getNewTokenResponse>
    </env:Body>
</env:Envelope>

但是我真正的问题是，我发现了很多很好的示例代码，名称空间没有前缀，并且xml文件的结构可能有所不同.因此，在这里我很困惑地无法完成任务.我将不胜感激任何建议.干杯:D

But my real problem is, I found many good example codes, namespaces are not prefixed and structure of xml file can vary. So here I am being confused to achieve the task. I'll appreciate any advice. Cheers:D

推荐答案

要使用Java中的命名空间进行XPath查询，我相信您需要执行以下操作:

To do an XPath query with namespaces in Java, I believe you need to do something like this:

XPath xpath = XPathFactory.newInstance().newXPath();
xpath.setNamespaceContext(new NamespaceContext() {
    @Override
    public String getNamespaceURI(String prefix) {
        switch (prefix) {
            case "env":
                return "http://schemas.xmlsoap.org/soap/envelope/";
            case "ns2":
                return "http://abc.examples.com/";
        }

        return XMLConstants.NULL_NS_URI;
    }

    @Override
    public String getPrefix(String namespaceURI) {
        throw new UnsupportedOperationException("Not supported yet.");
    }

    @Override
    public Iterator getPrefixes(String namespaceURI) {
        throw new UnsupportedOperationException("Not supported yet.");
    }
});

Node getNewTokenResp = 
     (Node) xpath.evaluate("/env:Envelope/env:Body/ns2:getNewTokenResponse", 
     document, XPathConstants.NODE);

在创建DocumentBuilder来解析文档之前，还需要在DocumentBuilderFactory上调用.setNamespaceAware(true);.

You also need to call .setNamespaceAware(true); on your DocumentBuilderFactory before you create the DocumentBuilder to parse your document.

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