在 Spring Boot 应用程序中添加 Servlet 过滤器
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/26151057/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Add a Servlet Filter in a Spring Boot application
提问by dVaffection
I'd like to have ETag suport. For this purpose there is a ShallowEtagHeaderFilterwhich 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)?
我想要ETag 支持。为此，有一个ShallowEtagHeaderFilter可以完成所有工作的。如何在不声明它的情况下添加它web.xml（实际上并不存在，因为到目前为止我以某种方式没有它）？
P.S. I use Spring Boot 1.1.4
PS我使用Spring Boot 1.1.4
P.P.S. Here's a full solution
PPS 这是一个完整的解决方案
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;
}
}
回答by Brian Clozel
When using Spring Boot
使用 Spring Boot 时
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!
正如参考文档中提到的，唯一需要的步骤是在配置类中将该过滤器声明为一个 Bean，就是这样！
@Configuration
public class WebConfig {
@Bean
public Filter shallowEtagHeaderFilter() {
return new ShallowEtagHeaderFilter();
}
}
When using Spring MVC
使用 Spring MVC 时
You're probably already extending a WebApplicationInitializer. If not, then you should convert your webapp configuration from a web.xmlfile to a WebApplicationInitializerclass.
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。
If your context configuration lives in XML file(s), you can create a class that extends AbstractDispatcherServletInitializer- if using configuration classes, AbstractAnnotationConfigDispatcherServletInitializeris the proper choice.
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类AbstractDispatcherServletInitializer- 如果使用配置类，AbstractAnnotationConfigDispatcherServletInitializer则是正确的选择。
In any case, you can then add Filter registration:
在任何情况下，您都可以添加过滤器注册：
@Override
protected Filter[] getServletFilters() {
return new Filter[] {
new ShallowEtagHeaderFilter();
};
}
Full examples of code-based Servlet container initialization are available in the Spring reference documentation.
回答by Andrii Abramov
A bit late answer.
回答有点晚。
My solution was to create custom annotation:
我的解决方案是创建自定义注释：
import org.springframework.core.annotation.AliasFor;
import org.springframework.stereotype.Component;
// ...
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
@Component
public @interface Filter {
@AliasFor(annotation = Component.class, attribute = "value")
String value() default "";
}
And then simply apply it to the filter implementations:
然后简单地将它应用到过滤器实现：
@Filter
public class CustomFilter extends AbstractRequestLoggingFilter {
@Override
protected void beforeRequest(HttpServletRequest request, String message) {
logger.debug("before req params:", request.getParameterMap());
}
@Override
protected void afterRequest(HttpServletRequest request, String message) {
logger.debug("after req params:", request.getParameterMap());
}
}
See more: @AliasFor, Spring custom annotations question
查看更多：@AliasFor，Spring自定义注解问题
