在 Spring Boot 应用程序中添加 Servlet 过滤器 [英] Add a Servlet Filter in a Spring Boot application
问题描述
我想要ETag支持.为此,有一个 ShallowEtagHeaderFilter
可以完成所有工作.如何添加它而不在我的 web.xml
中声明它(实际上并不存在,因为到目前为止我以某种方式没有它)?
I'd like to have ETag suport. For this purpose there is a ShallowEtagHeaderFilter
which does all the work. How can I add it without declaring it in my web.xml
(which actually does not exist, because I somehow got by without it so far)?
附言我使用的是 Spring Boot 1.1.4
P.S. I use Spring Boot 1.1.4
P.P.S.这是一个完整的解决方案
P.P.S. Here's a full solution
package cuenation.api;
import org.springframework.boot.context.embedded.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.filter.ShallowEtagHeaderFilter;
import javax.servlet.DispatcherType;
import java.util.EnumSet;
@Configuration
public class WebConfig {
@Bean
public FilterRegistrationBean shallowEtagHeaderFilter() {
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter(new ShallowEtagHeaderFilter());
registration.setDispatcherTypes(EnumSet.allOf(DispatcherType.class));
registration.addUrlPatterns("/cue-categories");
return registration;
}
}
推荐答案
使用 Spring Boot 时
作为 参考文档中提到,唯一需要的步骤是在配置类中将该过滤器声明为Bean,就是这样!
When using Spring Boot
As mentioned in the reference documentation, the only step needed is to declare that filter as a Bean in a configuration class, that's it!
@Configuration
public class WebConfig {
@Bean
public Filter shallowEtagHeaderFilter() {
return new ShallowEtagHeaderFilter();
}
}
使用 Spring MVC 时
您可能已经在扩展 WebApplicationInitializer
.如果没有,那么您应该将您的 webapp 配置从 web.xml
文件转换为 WebApplicationInitializer
类.
When using Spring MVC
You're probably already extending a WebApplicationInitializer
. If not, then you should convert your webapp configuration from a web.xml
file to a WebApplicationInitializer
class.
如果您的上下文配置存在于 XML 文件中,您可以创建一个扩展 AbstractDispatcherServletInitializer
的类 - 如果使用配置类,AbstractAnnotationConfigDispatcherServletInitializer
是正确的选择.
If your context configuration lives in XML file(s), you can create a class that extends AbstractDispatcherServletInitializer
- if using configuration classes, AbstractAnnotationConfigDispatcherServletInitializer
is the proper choice.
无论如何,您都可以添加过滤器注册:
In any case, you can then add Filter registration:
@Override
protected Filter[] getServletFilters() {
return new Filter[] {
new ShallowEtagHeaderFilter();
};
}
的完整示例Spring 参考文档中提供了基于代码的 Servlet 容器初始化.
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