java使用ServletRegistration可以配置什么。动态

Question

这是一个关于Java认证1Z0-899的问题
我必须选择两个答案

问题是：

ServletRegistration.Dynamic can be used to configure:

A) Filter mappings
B) add init params
C) set asyncSupported to true
D) add Listeners

我认为这应该是正确的B，C。但我的文字说的是A，B。
谁是对的

Answer 1

A）要配置过滤器映射，可以使用 FilterRegistration.Dynamic.addMappingForServletNames(java.util.EnumSet dispatcherTypes, boolean b, java.lang.String... strings)或FilterRegistration.Dynamic.(java.util.EnumSet dispatcherTypes, boolean b, java.lang.String... strings)

B）用于添加initParams-ServletRegistration.Dynamic.setInitParameter(java.lang.String s, java.lang.String s1)或ServletRegistration.Dynamic. setInitParameters(java.util.Map stringStringMap)

C）将asyncSupported设置为true ServletRegistration.Dynamic.setAsyncSupported(boolean b)

D）添加带有ServletContext.addListener(T t)的侦听器

这意味着正确的答案是B和C

Answer 2

从Servlet Context 3.0的规范第31页：

4.4.1 Programmatically adding and configuring Servlets

The ability to programmatically add a servlet to a context is useful for framework developers. For example a framework could declare a controller servlet using this method. The return value of this method is a ServletRegistration or a ServletRegistration.Dynamic object which further allows you to setup the other parameters of the servlet like init-params, url-mappings etc. There are three overloaded versions of the method as described below.

可以看到，它们提到了init参数和url映射

因此，也许是谁创建了这个问题/答案，请选择以下文本：），以及ServletRegistration。Dynamic用于以编程方式配置由Servlet上下文创建或添加的Servlet，如添加映射、init param和设置安全约束属性

谢谢!