从freemarker获取请求标头

问题描述

我想使用Freemarker作为模板引擎在我的网站上创建AJAX导航.如果使用XMLHttpRequest请求页面，则无需包括页面页眉和页脚.代码将如下所示:

I want to create AJAX-navigation on my site with Freemarker as template engine.If page are requested with XMLHttpRequest, there is no need to include page header and footer. Code will be look like this:

[#if !XMLHttpRequest]
    [#include "header.ftl"]
[/#if]
${content}
[#if !XMLHttpRequest]
    [#include "footer.ftl"]
[/#if]

我的问题是如何定义AJAX附带的请求.客户端添加标头X-Requested-With:XMLHttpRequest，如何在Freemarker中获得标头?我试图在 HttpRequestHashModel

My question is how to define that the request came with AJAX. Client adds header X-Requested-With: XMLHttpRequest, and how do I get it in Freemarker?I tried to find it in HttpRequestHashModel:

[#assign XMLHttpRequest = Request.headers['X-Requested-With']=="XMLHttpRequest" /]

，但会引发错误Expression Request.headers is undefined.我也尝试使用RequestParameters，它也无济于事.

but it throws error Expression Request.headers is undefined. I also tried to use RequestParameters it can't help too.

推荐答案

FreeMarker本身未定义任何与HTTP相关的变量.它不像JSP，而是通用引擎.它只看到传递给它的变量，并且不知道它们是什么...就FreeMarker而言，它们只是名称-值对.因此，如果您需要此信息，则应该在操作中将其传递给FreeMarker(可能是全局使用过滤器或拦截器，也可以是其他任何东西)，或者Web应用程序框架应该将其传递.

FreeMarker itself doesn't define any HTTP related variables; it's not like JSP, it's a general purpose engine; it only sees variables that were passed to it, and it doesn't know what they are... they are just name-value pairs as far as FreeMarker is concerned. So if you need this information, then either you should pass it to FreeMarker in the actions (maybe globally with a filter or interceptor or whatever you have), or the web application framework should.

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