SpringBoot 的过滤器 Filter 配置的三种方式

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"})

1@SpringBootApplication
2@ServletComponentScan
3public class ServicemapServicecenterBackendApplication {
4
5	public static void main(String[] args) {
6		SpringApplication.run(ServicemapServicecenterBackendApplication.class, args);
7	}
8}
9
10@WebFilter(urlPatterns = {"/test"})
11public class FilterTwo extends OncePerRequestFilter {
12
13	@Override
14	protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
15		System.out.println("************************** FilterTwo **************************");
16		filterChain.doFilter(request, response);
17	}
18
19}

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

1@Component
2@Order(100)
3public class FilterOne extends OncePerRequestFilter {
4
5	@Override
6	protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
7		System.out.println("************************** FilterOne **************************");
8		filterChain.doFilter(request, response);
9	}
10}

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)

1@Order(100)
2public class FilterOne extends OncePerRequestFilter {
3
4	@Override
5	protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
6		System.out.println("************************** FilterOne **************************");
7		filterChain.doFilter(request, response);
8	}
9}
10
11@SpringBootConfiguration
12public class FilterConfig {
13
14	@Bean
15	public FilterRegistrationBean<FilterOne> filterOneRegister() {
16		FilterRegistrationBean<FilterOne> filterRegistrationBean = new FilterRegistrationBean<>();
17		filterRegistrationBean.setFilter(new FilterOne());
18		filterRegistrationBean.addUrlPatterns("/*");
19//		filterRegistrationBean.setOrder(100);
20		return filterRegistrationBean;
21	}
22}