[英]How to parse xml with namespace using Xpath java
I have an xml that has namespace but without prefix. 我有一个具有名称空间但没有前缀的xml。 I have xpaths but with prefix that are generated from Schematron.
我有xpath,但有从Schematron生成的前缀。 I want to get element detail from that xml using xpath with prefixes.
我想使用带有前缀的xpath从该xml获取元素详细信息。
Here is my XML 这是我的XML
<?xml version="1.0" encoding="UTF-8"?>
<section xmlns="http://foo" type="abc" id="ad">
<title>Document Title</title>
<body>
<p>
<t>Document Body</t>
</p>
<p>
<t>Document Body</t>
</p>
<p>
<t>Document Body</t>
</p>
</body>
</section>
And here is the java code 这是java代码
package com;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;
import javax.xml.namespace.NamespaceContext;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
public class XPathTest {
public static void main(String[] args) {
File inputFile = new File("files/my_xml.xml");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder;
try {
dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(inputFile);
doc.getDocumentElement().normalize();
XPath xPath = XPathFactory.newInstance().newXPath();
HashMap<String, String> prefMap = new HashMap<String, String>() {
{
put("q", "http://foo");
}
};
SmartContentNameSpaceContext namespaces = new SmartContentNameSpaceContext(prefMap);
xPath.setNamespaceContext(namespaces);
String expression = "//q:section[1]";
NodeList nodeList = (NodeList) xPath.compile(expression).evaluate(doc, XPathConstants.NODESET);
for (int i = 0; i < nodeList.getLength(); i++) {
Node node = nodeList.item(i);
System.out.println(node.getAttributes().item(0));
System.out.println("current element : " + node.getNodeName());
}
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (XPathExpressionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
I read about NameSpaceContext interface so I have tried 我读了有关NameSpaceContext接口的文章,所以我尝试了
HashMap<String, String> prefMap = new HashMap<String, String>() {
{
put("q", "foo");
}
};
MyNameSpaceContext namespaces = new MyNameSpaceContext(prefMap);
xPath.setNamespaceContext(namespaces);
and here is the MyNameSpaceContext 这是MyNameSpaceContext
package com;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import javax.xml.namespace.NamespaceContext;
public class MyNameSpaceContext implements NamespaceContext {
private final Map<String, String> PREF_MAP = new HashMap<String, String>();
public SmartContentNameSpaceContext(final Map<String, String> prefMap) {
PREF_MAP.putAll(prefMap);
}
@Override
public String getNamespaceURI(String prefix) {
return PREF_MAP.get(prefix);
}
@Override
public String getPrefix(String namespaceURI) {
return null;
}
@Override
public Iterator getPrefixes(String namespaceURI) {
return null;
}
}
But this isnot working? 但这行不通吗?
You need to make sure you use 您需要确保使用
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
dbFactory.setNamespaceAware(true);
if you want to use XPath on a DOM tree. 如果要在DOM树上使用XPath。 I have not looked further for other problems.
我没有进一步寻找其他问题。
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