Java Spring - 在运行时添加和删除过滤器

Question

我有一个请求转储过滤器，我想在运行时激活/停用(使用自定义执行器端点)。但是，我无法找到无需重新启动应用程序即可执行此操作的方法。我当前的解决方案就是这样做的:

@Configuration
public class AppConfigs {

    @Value("${request.dumper.active:false}")
    private Boolean dumpActive;

    @Bean
    public FilterRegistrationBean requestDumperFilter() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        Filter requestDumperFilter = new RequestDumperFilter();
        registration.setFilter(requestDumperFilter);
        registration.addUrlPatterns("/*");
        registration.setEnabled(dumpActive);
        return registration;
    }

现在我想使用类似的东西:

@Component
public class RequestdumperEndpoint implements Endpoint<Boolean > {

    @Autowired
    private RequestDumperFilter requestDumperFilter;

    public String getId() {
        return "requestdumper";
    }

    public Boolean invoke() {
        return requestDumperFilter.isEnabled();
    }

    public Boolean setEnabled(Boolean enabled) {
        return requestDumperFilter.setEnabled(enabled);
    }

但显然 Filter 上没有 isEnabled 和 setEnabled 方法。

有什么想法可以让我得到我需要的东西吗？

Answer 1

首先添加你的过滤器作为一个bean，这样你就可以挂接到它:

public class MyWebInitializer extends
        AbstractAnnotationConfigDispatcherServletInitializer {

    @Value("${request.dumper.active:false}")
    private Boolean dumpActive;

    @Bean
    private MyRequestDumperFilter myRequestDumperFilter() {
        MyRequestDumperFilter filter = new MyRequestDumperFilter();
        filter.setEnabled(dumpActive);
        return filter;
    }

    @Override
    protected String[] getServletMappings() {
        //..
        return new String[0];
    }

    @Override
    protected Filter[] getServletFilters() {
        return new Filter[]{myRequestDumperFilter()};
    }

    @Override
    protected Class<?>[] getRootConfigClasses() {
        //..
        return new Class<?>[0];
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        //..
        return new Class<?>[0];
    }
}

您的过滤器将类似于:

    public class MyRequestDumperFilter extends RequestDumperFilter{
        private Boolean enabled;

        public void setEnabled(Boolean enabled) {
            this.enabled = enabled;
        }

        public Boolean getEnabled() {
            return enabled;
        }

        @Override
        public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
            if (enabled) {
                super.doFilter(request, response, chain);
            }
            else {
                chain.doFilter(request,response);
            }
        }
    }