SpringBoot2整合Filter

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本文介绍了SpringBoot2中整合Filter的三种方法：注解方式（支持Bean注入）、配置类方式（可设置执行顺序）以及WebFilter注解方式。重点讨论了注解方式和配置类方式下的Filter执行顺序。

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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;
    }
}