jakarta-ee - 用 Servlet 3.0 注释替换 context-param 元素

Question

给定:一个 Java EE 5 web 应用程序，它有一个 web.xml，它有一个像

<context-param>
    <description>c</description>
    <param-name>a</param-name>
    <param-value>b</param-value>
</context-param>

我需要做什么才能将该上下文参数规范移动到基于注释的策略中。

Answer 1

您可以找到所有 javax.servlet javax.servlet.annotation 中的注释套餐概要:

• @HandlesTypes This annotation is used to declare the class types that a ServletContainerInitializer can handle.
• @HttpConstraint This annotation is used within the ServletSecurity annotation to represent the security constraints to be applied to all HTTP protocol methods for which a corresponding HttpMethodConstraint element does NOT occur within the ServletSecurity annotation.
• @HttpMethodConstraint This annotation is used within the ServletSecurity annotation to represent security constraints on specific HTTP protocol messages.
• @MultipartConfig Annotation that may be specified on a Servlet class, indicating that instances of the Servlet expect requests that conform to the multipart/form-data MIME type.
• @ServletSecurity This annotation is used on a Servlet implementation class to specify security constraints to be enforced by a Servlet container on HTTP protocol messages.
• @WebFilter Annotation used to declare a servlet Filter.
• @WebInitParam This annotation is used on a Servlet or Filter implementation class to specify an initialization parameter.
• @WebListener This annotation is used to declare a WebListener.
• @WebServlet Annotation used to declare a servlet.

你看，没有什么比 @WebContextParam .这也或多或少有意义；你会/可以在什么样的类(class)上设置它？

一些依赖于上下文参数的基于 Servlet 的框架，例如 JSF，也允许通过 JNDI 设置其中的一些。你可能想研究一下。或者如果它涉及本土代码，那么我会看看 @WebInitParam对您来说不是更可行的选择。