import org.springframework.web.context.support.ServletContextResourceLoader; //导入依赖的package包/类
@Bean
@ConditionalOnMissingBean(PebbleEngine.class)
public PebbleEngine pebbleEngine(final PebbleEngineConfigurer pebbleEngineConfigurer) {
    final PebbleTemplateLoader loader = new PebbleTemplateLoader();
    loader.setResourceLoader(new ServletContextResourceLoader(context.getServletContext()));
    loader.setPrefix(this.properties.getPrefix());
    loader.setSuffix(this.properties.getSuffix());

    final List<Loader<?>> list = new ArrayList<>();
    list.add(loader);
    list.add(new ClasspathLoader());
    list.add(new FileLoader());

    final DelegatingLoader loaderAll = new DelegatingLoader(list);
    pebbleEngineConfigurer.setLoader(loaderAll);
    pebbleEngineConfigurer.setCache(this.properties.isCache());
    pebbleEngineConfigurer.setCacheSize(this.properties.getCacheSize());

    return pebbleEngineConfigurer.getPebbleEngine();
}
 

import org.springframework.web.context.support.ServletContextResourceLoader; //导入依赖的package包/类
/**
 * Standard way of initializing this filter.
 * Map config parameters onto bean properties of this filter, and
 * invoke subclass initialization.
 * @param filterConfig the configuration for this filter
 * @throws ServletException if bean properties are invalid (or required
 * properties are missing), or if subclass initialization fails.
 * @see #initFilterBean
 */
@Override
public final void init(FilterConfig filterConfig) throws ServletException {
	Assert.notNull(filterConfig, "FilterConfig must not be null");
	if (logger.isDebugEnabled()) {
		logger.debug("Initializing filter '" + filterConfig.getFilterName() + "'");
	}

	this.filterConfig = filterConfig;

	// Set bean properties from init parameters.
	try {
		PropertyValues pvs = new FilterConfigPropertyValues(filterConfig, this.requiredProperties);
		BeanWrapper bw = PropertyAccessorFactory.forBeanPropertyAccess(this);
		ResourceLoader resourceLoader = new ServletContextResourceLoader(filterConfig.getServletContext());
		bw.registerCustomEditor(Resource.class, new ResourceEditor(resourceLoader, this.environment));
		initBeanWrapper(bw);
		bw.setPropertyValues(pvs, true);
	}
	catch (BeansException ex) {
		String msg = "Failed to set bean properties on filter '" +
			filterConfig.getFilterName() + "': " + ex.getMessage();
		logger.error(msg, ex);
		throw new NestedServletException(msg, ex);
	}

	// Let subclasses do whatever initialization they like.
	initFilterBean();

	if (logger.isDebugEnabled()) {
		logger.debug("Filter '" + filterConfig.getFilterName() + "' configured successfully");
	}
}
 

import org.springframework.web.context.support.ServletContextResourceLoader; //导入依赖的package包/类
/**
 * Map config parameters onto bean properties of this servlet, and
 * invoke subclass initialization.
 * @throws ServletException if bean properties are invalid (or required
 * properties are missing), or if subclass initialization fails.
 */
@Override
public final void init() throws ServletException {
	if (logger.isDebugEnabled()) {
		logger.debug("Initializing servlet '" + getServletName() + "'");
	}

	// Set bean properties from init parameters.
	try {
		PropertyValues pvs = new ServletConfigPropertyValues(getServletConfig(), this.requiredProperties);
		BeanWrapper bw = PropertyAccessorFactory.forBeanPropertyAccess(this);
		ResourceLoader resourceLoader = new ServletContextResourceLoader(getServletContext());
		bw.registerCustomEditor(Resource.class, new ResourceEditor(resourceLoader, getEnvironment()));
		initBeanWrapper(bw);
		bw.setPropertyValues(pvs, true);
	}
	catch (BeansException ex) {
		logger.error("Failed to set bean properties on servlet '" + getServletName() + "'", ex);
		throw ex;
	}

	// Let subclasses do whatever initialization they like.
	initServletBean();

	if (logger.isDebugEnabled()) {
		logger.debug("Servlet '" + getServletName() + "' configured successfully");
	}
}
 

import org.springframework.web.context.support.ServletContextResourceLoader; //导入依赖的package包/类
/**
 * Standard way of initializing this filter.
 * Map config parameters onto bean properties of this filter, and
 * invoke subclass initialization.
 * @param filterConfig the configuration for this filter
 * @throws ServletException if bean properties are invalid (or required
 * properties are missing), or if subclass initialization fails.
 * @see #initFilterBean
 */
public final void init(FilterConfig filterConfig) throws ServletException {
	Assert.notNull(filterConfig, "FilterConfig must not be null");
	if (logger.isDebugEnabled()) {
		logger.debug("Initializing filter '" + filterConfig.getFilterName() + "'");
	}

	this.filterConfig = filterConfig;

	// Set bean properties from init parameters.
	try {
		PropertyValues pvs = new FilterConfigPropertyValues(filterConfig, this.requiredProperties);
		BeanWrapper bw = PropertyAccessorFactory.forBeanPropertyAccess(this);
		ResourceLoader resourceLoader = new ServletContextResourceLoader(filterConfig.getServletContext());
		bw.registerCustomEditor(Resource.class, new ResourceEditor(resourceLoader, this.environment));
		initBeanWrapper(bw);
		bw.setPropertyValues(pvs, true);
	}
	catch (BeansException ex) {
		String msg = "Failed to set bean properties on filter '" +
			filterConfig.getFilterName() + "': " + ex.getMessage();
		logger.error(msg, ex);
		throw new NestedServletException(msg, ex);
	}

	// Let subclasses do whatever initialization they like.
	initFilterBean();

	if (logger.isDebugEnabled()) {
		logger.debug("Filter '" + filterConfig.getFilterName() + "' configured successfully");
	}
}
 

import org.springframework.web.context.support.ServletContextResourceLoader; //导入依赖的package包/类
@Override
protected void initContext(FilterConfig config) throws ServletException {

     try {
         PropertyValues pvs = new FilterConfigPropertyValues(getFilterConfig(), requiredProperties);
         BeanWrapper bw = PropertyAccessorFactory.forBeanPropertyAccess(this);
         ResourceLoader resourceLoader = new ServletContextResourceLoader(getServletContext());
         bw.registerCustomEditor(Resource.class, new ResourceEditor(resourceLoader));
         initBeanWrapper(bw);
         bw.setPropertyValues(pvs, true);
     } catch (Exception e) {
         throw new ServletException("Failed to set bean properties on filter: " + getFilterName(), e);
     }

    }
 

import org.springframework.web.context.support.ServletContextResourceLoader; //导入依赖的package包/类
@PostConstruct
public void init() {
	if (this.resourceLoader == null) {
		this.resourceLoader = new ServletContextResourceLoader(servletContext);
	}
}