SpringBoot2整合Filter

超、凢脫俗 2021-10-24 00:24 399阅读 0赞

1.方法一：注解方式，这种方式可以注入容器里的bean

@Component
    @WebFilter(filterName = "test1" ,urlPatterns = "/*")
    public class TestFilterOrder implements Filter {
        @Override
        public void init(FilterConfig filterConfig) throws ServletException {
    
        }
    
        @Override
        public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
            log.info("filter start");
            filterChain.doFilter(servletRequest,servletResponse);
        }
    
        @Override
        public void destroy() {
    
        }
    }

方法二：注解方式

@WebFilter(filterName = "test1" ,urlPatterns = "/*")
    public class TestFilterOrder implements Filter {
        @Override
        public void init(FilterConfig filterConfig) throws ServletException {
    
        }
    
        @Override
        public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
            log.info("filter start");
            filterChain.doFilter(servletRequest,servletResponse);
        }
    
        @Override
        public void destroy() {
    
        }
    }

@ServletComponentScan(basePackages = "com.mmall.controller.common.filters")
    public class MyMmallApplication {
    
    	public static void main(String[] args) {
    		SpringApplication.run(MyMmallApplication.class, args);
    	}
    
    }

方法一和方法二可以在Filter里@autowire其他的Bean，方法三不能自动装配

方法三：配置类，可以设置Filter顺序，Order越小越先执行

@Configuration
    public class FilterConfig {
    
        @Bean
        public FilterRegistrationBean<TestFilterOrder> testFilterOrder(){
            FilterRegistrationBean<TestFilterOrder> sessionExpireFilterFilterRegistrationBean = new FilterRegistrationBean<>(new TestFilterOrder());
            sessionExpireFilterFilterRegistrationBean.setName("testFilterOrder");
            ArrayList<String> urls = new ArrayList<>();
            urls.add("*.do");
            sessionExpireFilterFilterRegistrationBean.setUrlPatterns(urls);
            sessionExpireFilterFilterRegistrationBean.setOrder(3);
            return sessionExpireFilterFilterRegistrationBean;
        }
    
        @Bean
        public FilterRegistrationBean<TestFilterOrder2> testFilterOrder2(){
            FilterRegistrationBean<TestFilterOrder2> sessionExpireFilterFilterRegistrationBean = new FilterRegistrationBean<>(new TestFilterOrder2());
            sessionExpireFilterFilterRegistrationBean.setName("testFilterOrder2");
            ArrayList<String> urls = new ArrayList<>();
            urls.add("*.do");
            sessionExpireFilterFilterRegistrationBean.setUrlPatterns(urls);
            sessionExpireFilterFilterRegistrationBean.setOrder(2);
            return sessionExpireFilterFilterRegistrationBean;
        }
    }

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同时有配置的类和注解方式的话，filter顺序：首先是用配置文件配置的Filter（按照Order顺序），然后是WebFilter注解配置的。

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