SpringBoot 的过滤器 Filter 配置

SpringBoot 过滤器配置有三种方式

1. @ServletComponentScan + @WebFilter, 可配置过滤路径, 但没有顺序(顺序是由过滤器命名决定)

在启动类上使用 @ServletComponentScan, 在过滤器类上使用 @WebFilter(urlPatterns = {"/test/path"})

@SpringBootApplication
@ServletComponentScan
public class ServicemapServicecenterBackendApplication {

	public static void main(String[] args) {
		SpringApplication.run(ServicemapServicecenterBackendApplication.class, args);
	}
}

@WebFilter(urlPatterns = {"/test"})
public class FilterTwo extends OncePerRequestFilter {

	@Override
	protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
		System.out.println("************************** FilterTwo **************************");
		filterChain.doFilter(request, response);
	}

}

2. @Component + @Order(100), 不可配置过滤路径, 可以通过@Order配置顺序

在过滤器类上使用 @Component , @Order(100) 数值越小优先级越高

@Component
@Order(100)
public class FilterOne extends OncePerRequestFilter {

	@Override
	protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
		System.out.println("************************** FilterOne **************************");
		filterChain.doFilter(request, response);
	}
}

3. @SpringBootConfiguration + @Order, 可配置过滤路径, 可以通过@Order配置顺序, 也可以在代码中setOrder(100)配置 (推荐方式)

@Order(100)
public class FilterOne extends OncePerRequestFilter {

	@Override
	protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
		System.out.println("************************** FilterOne **************************");
		filterChain.doFilter(request, response);
	}
}

@SpringBootConfiguration
public class FilterConfig {

	@Bean
	public FilterRegistrationBean<FilterOne> filterOneRegister() {
		FilterRegistrationBean<FilterOne> filterRegistrationBean = new FilterRegistrationBean<>();
		filterRegistrationBean.setFilter(new FilterOne());
		filterRegistrationBean.addUrlPatterns("/*");
//		filterRegistrationBean.setOrder(100);
		return filterRegistrationBean;
	}
}