在Thymeleaf方言处理器中访问HttpServletRequest和HttpServletResponse

Question

我试图创建一个Thymeleaf方言处理器，它执行ServletDispatcher.Include。我已经扩展了AbstractElementTagProcessor并重写了doProcess方法。相关的代码片段是：

@Override
protected void doProcess(final ITemplateContext context, final IProcessableElementTag tag, final IElementTagStructureHandler structureHandler) {
    ServletContext servletContext = null; // TODO: get servlet context
    HttpServletRequest request = null; // TODO: get request
    HttpServletResponse response = null; // TODO: get response

    // Retrieve dispatcher to component JSP view
    RequestDispatcher dispatcher = servletContext.getRequestDispatcher("/something");

    // Create wrapper (acts as response, but stores output in a CharArrayWriter)
    CharResponseWrapper wrapper = new CharResponseWrapper(response);

    // Run the include
    dispatcher.include(request, wrapper);

    String result = wrapper.toString();

    // Create a model with the returned string
    final IModelFactory modelFactory = context.getModelFactory();
    final IModel model = modelFactory.parse(context.getTemplateData(), result);

    // Instruct the engine to replace this entire element with the specified model
    structureHandler.replaceWith(model, false);

Answer 1

您可以直接在Thymeleaf视图中访问request（通过使用#request对象，使您能够直接访问javax.servlet.http.httpservletrequest对象）参数和session（通过使用#session对象，使您能够直接访问javax.servlet.http.httpsession对象）属性：

${#request.getAttribute('foo')}
${#request.getParameter('foo')}
${#request.getContextPath()}
${#request.getRequestName()}

<p th:if="${#request.getParameter('yourParameter') != null
      th:text="${#request.getParameter('yourParameter')}"}">Request Param</p>

${#session.getAttribute('foo')}
${#session.id}
${#session.lastAccessedTime}

<p th:if="${session != null}"> th:text="${session.yourAttribute}"</p>

在这里阅读更多。