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                ###70.1.1 使用Spring bean添加Servlet, Filter或Listener 想要添加`Servlet`,`Filter`或Servlet`*Listener`,你只需要為它提供一個`@Bean`定義,這種方式很適合注入配置或依賴。不過,需要注意的是它們不會導致其他很多beans的熱初始化,因為它們需要在應用生命周期的早期進行安裝(讓它依賴`DataSource`或JPA配置不是好主意),你可以通過懶加載突破該限制(在第一次使用時才初始化)。 對于`Filters`或`Servlets`,你可以通過`FilterRegistrationBean`或`ServletRegistrationBean`添加映射和初始化參數。 **注** 在一個filter注冊時,如果沒指定`dispatcherType`,它將匹配`FORWARD`,`INCLUDE`和`REQUEST`。如果啟用異步,它也將匹配`ASYNC`。如果遷移`web.xml`中沒有`dispatcher`元素的filter,你需要自己指定一個`dispatcherType`: ```java @Bean public FilterRegistrationBean myFilterRegistration() { FilterRegistrationBean registration = new FilterRegistrationBean(); registration.setDispatcherTypes(DispatcherType.REQUEST); .... return registration; } ``` **禁止Servlet或Filter的注冊** 如上所述,任何`Servlet`或`Filter` beans都將自動注冊到servlet容器。不過,為特定的`Filter`或`Servlet` bean創建一個registration,并將它標記為disabled,可以禁用該filter或servlet。例如: ```java @Bean public FilterRegistrationBean registration(MyFilter filter) { FilterRegistrationBean registration = new FilterRegistrationBean(filter); registration.setEnabled(false); return registration; } ```
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