> For the complete documentation index, see [llms.txt](https://jack80342.gitbook.io/thymeleaf/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jack80342.gitbook.io/thymeleaf/i.-using-thymeleaf/18-appendix-a-expression-basic-objects/web-context-objects.md).

# 网络上下文对象

在网络环境下，如下对象可以直接访问（注意：它们是对象，不是映射或者命名空间）：

* **#request** ：直接访问与当前请求相关联的`javax.servlet.http.HttpServletRequest`对象。

  ```java
  ${#request.getAttribute('foo')}
  ${#request.getParameter('foo')}
  ${#request.getContextPath()}
  ${#request.getRequestName()}
  ...
  ```
* **#session** ：直接访问与当前请求相关联的`javax.servlet.http.HttpSession`对象。

  ```java
  ${#session.getAttribute('foo')}
  ${#session.id}
  ${#session.lastAccessedTime}
  ...
  ```
* **#servletContext**：直接访问与当前请求相关联的`javax.servlet.ServletContext`对象。

  ```java
  ${#servletContext.getAttribute('foo')}
  ${#servletContext.contextPath}
  ...
  ```