Java XPathFactory.setFeature方法代码示例

import javax.xml.xpath.XPathFactory; //导入方法依赖的package包/类
/**
 * Returns properly configured (e.g. security features) factory
 * - securityProcessing == is set based on security processing property, default is true
 */
public static XPathFactory createXPathFactory(boolean disableSecureProcessing) throws IllegalStateException {
    try {
        XPathFactory factory = XPathFactory.newInstance();
        if (LOGGER.isLoggable(Level.FINE)) {
            LOGGER.log(Level.FINE, "XPathFactory instance: {0}", factory);
        }
        factory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, !isXMLSecurityDisabled(disableSecureProcessing));
        return factory;
    } catch (XPathFactoryConfigurationException ex) {
        LOGGER.log(Level.SEVERE, null, ex);
        throw new IllegalStateException( ex);
    } catch (AbstractMethodError er) {
        LOGGER.log(Level.SEVERE, null, er);
        throw new IllegalStateException(Messages.INVALID_JAXP_IMPLEMENTATION.format(), er);
    }
}
 

import javax.xml.xpath.XPathFactory; //导入方法依赖的package包/类
@Test
public void testXPath_DOM_withSM() {
    System.out.println("Evaluate DOM Source;  Security Manager is set:");
    setSystemProperty(DOM_FACTORY_ID, "MyDOMFactoryImpl");

    try {
        XPathFactory xPathFactory = XPathFactory.newInstance("http://java.sun.com/jaxp/xpath/dom",
                "com.sun.org.apache.xpath.internal.jaxp.XPathFactoryImpl", null);
        xPathFactory.setFeature(ORACLE_FEATURE_SERVICE_MECHANISM, true);
        if ((boolean) xPathFactory.getFeature(ORACLE_FEATURE_SERVICE_MECHANISM)) {
            Assert.fail("should not override in secure mode");
        }

    } catch (Exception e) {
        Assert.fail(e.getMessage());
    } finally {
        clearSystemProperty(DOM_FACTORY_ID);
    }
}
 

import javax.xml.xpath.XPathFactory; //导入方法依赖的package包/类
public static XPathFactory newXPathFactory(boolean secureXmlProcessingEnabled) {
    XPathFactory factory = XPathFactory.newInstance();
    try {
        factory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, isXMLSecurityDisabled(secureXmlProcessingEnabled));
    } catch (XPathFactoryConfigurationException e) {
        LOGGER.log(Level.WARNING, "Factory [{0}] doesn't support secure xml processing!", new Object[] { factory.getClass().getName() } );
    }
    return factory;
}
 

import javax.xml.xpath.XPathFactory; //导入方法依赖的package包/类
void evaluate(boolean enableExt) throws XPathFactoryConfigurationException, XPathExpressionException {
    Document document = getDocument();

    XPathFactory xPathFactory = XPathFactory.newInstance();
    /**
     * Use of the extension function 'http://exslt.org/strings:tokenize' is
     * not allowed when the secure processing feature is set to true.
     * Attempt to use the new property to enable extension function
     */
    if (enableExt) {
        boolean isExtensionSupported = enableExtensionFunction(xPathFactory);
    }

    xPathFactory.setXPathFunctionResolver(new MyXPathFunctionResolver());
    if (System.getSecurityManager() == null) {
        xPathFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, false);
    }

    XPath xPath = xPathFactory.newXPath();
    xPath.setNamespaceContext(new MyNamespaceContext());

    String xPathResult = xPath.evaluate(XPATH_EXPRESSION, document);
    System.out.println(
            "XPath result (enableExtensionFunction == " + enableExt + ") = \""
            + xPathResult
            + "\"");
}
 

import javax.xml.xpath.XPathFactory; //导入方法依赖的package包/类
boolean enableExtensionFunction(XPathFactory factory) {
    boolean isSupported = true;
    try {
        factory.setFeature(ENABLE_EXTENSION_FUNCTIONS, true);
    } catch (XPathFactoryConfigurationException ex) {
        isSupported = false;
    }
    return isSupported;
}
 

import javax.xml.xpath.XPathFactory; //导入方法依赖的package包/类
public static XPathFactory newXPathFactory(boolean disableSecurity) {
    XPathFactory factory = XPathFactory.newInstance();
    try {
        factory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, !xmlSecurityDisabled(disableSecurity));
    } catch (XPathFactoryConfigurationException e) {
        LOGGER.log(Level.WARNING, "Factory [{0}] doesn't support secure xml processing!", new Object[] { factory.getClass().getName() } );
    }
    return factory;
}