Autowire not word in filter, When we use FilterRegistrationBean in spring boot?

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form dropdown in spring boot

FilterRegistrationBean is a Spring Boot utility class that allows you to register a Filter as a bean and apply initialization parameters to it. The @Autowired annotation is used to inject a dependency into a Spring bean. It is not directly related to FilterRegistrationBean and would not typically be used in the same context as FilterRegistrationBean.

To use @Autowired with a Filter, you would typically define the Filter as a bean in your Spring configuration and use the @Autowired annotation to inject any required dependencies into the Filter bean. You can then register the Filter bean with FilterRegistrationBean and specify any necessary initialization parameters.

Here is an example of how you might use @Autowired with a Filter bean and FilterRegistrationBean in a Spring Boot application:

@Configuration
public class MyConfiguration {

  @Bean
  public MyFilter myFilter() {
    return new MyFilter();
  }

  @Bean
  public FilterRegistrationBean<MyFilter> myFilterRegistration(MyFilter myFilter) {
    FilterRegistrationBean<MyFilter> registration = new FilterRegistrationBean<>();
    registration.setFilter(myFilter);
    registration.addUrlPatterns("/*");
    return registration;
  }
}

public class MyFilter implements Filter {

  @Autowired
  private MyService myService;

  @Override
  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
    // use myService in the filter
  }
}

In this example, the MyFilter class is defined as a bean and has a dependency on MyService, which is injected using the @Autowired annotation. The MyFilter bean is then registered with FilterRegistrationBean, which configures the Filter to be applied to all URLs in the application.

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