javax.servlet.jsp.JspFactory#setDefaultFactory ( )源码实例Demo

/**
 * Initialize Jasper.
 *
 * @param classes the classes.
 * @param servletContext the Servlet context.
 * @throws ServletException when a Servlet error occurs.
 */
@Override
public void onStartup(Set<Class<?>> classes, ServletContext servletContext)
        throws ServletException {
    LOGGER.fine("Initializing Jasper integration");
    
    if (JspFactory.getDefaultFactory() == null) {
        JspFactory.setDefaultFactory(new JspFactoryImpl());
    }
    ServletRegistration.Dynamic registration = servletContext.addServlet(
            "JSP Servlet", "org.apache.jasper.servlet.JspServlet");
    registration.addMapping("*.jsp");
    String classpath = System.getProperty("java.class.path")
            + getClassesDirectory(servletContext)
            + getJarFiles(servletContext);
    
    if (LOGGER.isLoggable(Level.FINER)) {
        LOGGER.log(Level.FINER, "Jasper classpath is: {0}", classpath);
    }
    
    registration.setInitParameter("classpath", classpath);
    registration.setInitParameter("compilerSourceVM", "1.8");
    registration.setInitParameter("compilerTargetVM", "1.8");
    WebApplication webApplication = (WebApplication) servletContext;
    webApplication.setJspManager(new JasperJspManager());
    LOGGER.fine("Initialized Jasper integration");
}
 

private void setupJspFactory() {

		try {
			if (JspFactory.getDefaultFactory() == null) {
				// enforce setting the jspfactory instance as we know it here
				Class clz = Class.forName("org.apache.jasper.runtime.JspFactoryImpl"); //$NON-NLS-1$
				if (clz != null) {
					JspFactory.setDefaultFactory((JspFactory) clz.newInstance());
				}
			}
		} catch (Exception ex) {

		}
	}