Spring EL 变量列表? [英] List of Spring EL Variables?

问题描述

Spring EL 支持一些预定义的变量

Spring EL supports a some predefined variables

• {#systemProperties.... }
• {#systemEnvironment.... }
• {#request....}
• {#session....}

前两个曾经记录在 Spring 参考:第 6 章 Spring 表达式语言 (SpEL).Spring Reference 中没有提到另外两个(或者我没有找到它们.)(我在这个 slides，以及它在 spring social 和这个问题).

The first two once are documented in the Spring Reference: chapter 6. Spring Expression Language (SpEL). The two others are not mentioned in the Spring Reference (or I did not found them.) (I found them in this slides, as well as its usage in spring social and this question).

所以我的问题是:是否有或多或少完整的预定义 spring-el 变量列表?

我猜这些预定义变量中的一些不是由 spring 核心本身定义的，而是通过激活"某些模块(如 spring-mvc)来定义的.所以我对在或多或少常见的 spring + jpa + mvc + 安全应用程序中可用的变量很感兴趣.

I guess that some of this predefined variables are not defined by spring core itself, but by "activating" of some modules like spring-mvc. So I am interested in the the variables that are available in a more or less common spring + jpa + mvc + security application.

推荐答案

我无法回答你的根本问题，但我可以给你一个提示.

I can not answer your root question but I may give you a hint.

在您的应用程序上下文启动时注册了一些预定义的 bean，但这取决于您使用的上下文类型.

There are some predefined beans registered at start up of your application context but which depends on the context type you are using.

通常存在 systemProperties 和 systemEnvironment.在 Web 应用程序中加载 Spring，您还将获得 servletContext、contextParameters 和 contextAttributes.我假设 request 和 session 也与 Web 应用程序上下文相关.

Commonly, systemProperties and systemEnvironment are present. Loading Spring within a web application, you will also get servletContext, contextParameters and contextAttributes. I assume, request and session are related to a web application context as well.

我在调试使用 Spring 3.0.6RELEASE 的应用程序时发现了这一点.一个好的起点是 SpringBeanELResolver.getValue() 方法.

I discovered this during debugging of my application which uses Spring 3.0.6RELEASE. A good starting point is SpringBeanELResolver.getValue() method.

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