spring mvc view 相关

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/jsp/" />
    <property name="suffix" value=".jsp" />
</bean>

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">  
        <property name="defaultEncoding" value="utf-8" />  
        <!-- 文件大小最大值 -->
        <property name="maxUploadSize" value="10485760000" />  
        <!-- 内存中的最大值 -->
        <property name="maxInMemorySize" value="40960" />  
</bean> 

/**
     * Render the view given the specified model.
     * <p>The first step will be preparing the request: In the JSP case,
     * this would mean setting model objects as request attributes.
     * The second step will be the actual rendering of the view,
     * for example including the JSP via a RequestDispatcher.
     * @param model Map with name Strings as keys and corresponding model
     * objects as values (Map can also be {@code null} in case of empty model)
     * @param request current HTTP request
     * @param response HTTP response we are building
     * @throws Exception if rendering failed
     */
    void render(Map<String, ?> model, HttpServletRequest request, HttpServletResponse response) throws Exception;

public void render(Map<String, ?> model, HttpServletRequest request, HttpServletResponse response) throws Exception {
        if (logger.isTraceEnabled()) {
            logger.trace("Rendering view with name ‘" + this.beanName + "‘ with model " + model +
                " and static attributes " + this.staticAttributes);
        }

        Map<String, Object> mergedModel = createMergedOutputModel(model, request, response);
        prepareResponse(request, response);
        renderMergedOutputModel(mergedModel, getRequestToExpose(request), response);
}

/**
     * Prepare the given response for rendering.
     * <p>The default implementation applies a workaround for an IE bug
     * when sending download content via HTTPS.
     * @param request current HTTP request
     * @param response current HTTP response
     */
    protected void prepareResponse(HttpServletRequest request, HttpServletResponse response) {
        if (generatesDownloadContent()) {
            response.setHeader("Pragma", "private");
            response.setHeader("Cache-Control", "private, must-revalidate");
        }
}

protected final void renderMergedOutputModel(
            Map<String, Object> model, HttpServletRequest request, HttpServletResponse response) throws Exception {

        if (this.exposeRequestAttributes) {
            for (Enumeration<String> en = request.getAttributeNames(); en.hasMoreElements();) {
                String attribute = en.nextElement();
                if (model.containsKey(attribute) && !this.allowRequestOverride) {
                    throw new ServletException("Cannot expose request attribute ‘" + attribute +
                        "‘ because of an existing model object of the same name");
                }
                Object attributeValue = request.getAttribute(attribute);
                if (logger.isDebugEnabled()) {
                    logger.debug("Exposing request attribute ‘" + attribute +
                            "‘ with value [" + attributeValue + "] to model");
                }
                model.put(attribute, attributeValue);
            }
        }

        if (this.exposeSessionAttributes) {
            HttpSession session = request.getSession(false);
            if (session != null) {
                for (Enumeration<String> en = session.getAttributeNames(); en.hasMoreElements();) {
                    String attribute = en.nextElement();
                    if (model.containsKey(attribute) && !this.allowSessionOverride) {
                        throw new ServletException("Cannot expose session attribute ‘" + attribute +
                            "‘ because of an existing model object of the same name");
                    }
                    Object attributeValue = session.getAttribute(attribute);
                    if (logger.isDebugEnabled()) {
                        logger.debug("Exposing session attribute ‘" + attribute +
                                "‘ with value [" + attributeValue + "] to model");
                    }
                    model.put(attribute, attributeValue);
                }
            }
        }

        if (this.exposeSpringMacroHelpers) {
            if (model.containsKey(SPRING_MACRO_REQUEST_CONTEXT_ATTRIBUTE)) {
                throw new ServletException(
                        "Cannot expose bind macro helper ‘" + SPRING_MACRO_REQUEST_CONTEXT_ATTRIBUTE +
                        "‘ because of an existing model object of the same name");
            }
            // Expose RequestContext instance for Spring macros.
            model.put(SPRING_MACRO_REQUEST_CONTEXT_ATTRIBUTE,
                    new RequestContext(request, response, getServletContext(), model));
        }

        applyContentType(response);

        renderMergedTemplateModel(model, request, response);
    }

protected void doRender(Map<String, Object> model, HttpServletRequest request, HttpServletResponse response) throws Exception {
        // Expose model to JSP tags (as request attributes).
        exposeModelAsRequestAttributes(model, request);
        // Expose all standard FreeMarker hash models.
        SimpleHash fmModel = buildTemplateModel(model, request, response);

        if (logger.isDebugEnabled()) {
            logger.debug("Rendering FreeMarker template [" + getUrl() + "] in FreeMarkerView ‘" + getBeanName() + "‘");
        }
        // Grab the locale-specific version of the template.
        Locale locale = RequestContextUtils.getLocale(request);
        processTemplate(getTemplate(locale), fmModel, response);
    }