Springboot整合Servlet Filter和Interceptor

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最新推荐文章于 2025-02-21 16:28:12 发布

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分类专栏： SpringBoot高效开发实践文章标签： spring boot

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本文详细介绍如何在Spring框架中整合自定义的Filter和Interceptor，通过创建并注册Filter与Interceptor，实现对HTTP请求的预处理和后处理，特别关注于API接口的拦截与鉴权。

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一、整合Filter

1、写一个自己的Filter

@Component
public class MyFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("initFilter");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("doFilter...");
        filterChain.doFilter(servletRequest, servletResponse);
    }

    @Override
    public void destroy() {
        System.out.println("destroy");
    }
}

2、写一个Config类

@Configuration
public class WebConfig {

    @Autowired
    private MyFilter myFilter;

    public FilterRegistrationBean initFilter() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        filterRegistrationBean.setFilter(myFilter);
        filterRegistrationBean.setName("MyFilter");
        filterRegistrationBean.addUrlPatterns("/*");
        return filterRegistrationBean;
    }
}

二、整合Interceptor

1、写一个自己的Interceptor，当然这里preHandle等方法现在有默认实现，可以按需覆盖

@Component
public class MyInterceptor implements HandlerInterceptor {

    @Autowired
    private EverestConfig everestConfig;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        return null != everestConfig.getImageServer();
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}

2、写一个config类

@Configuration
public class WebMvcConfig implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new AuthInterceptor()).addPathPatterns("/api/**").excludePathPatterns("/api/index/auth");
        WebMvcConfigurer.super.addInterceptors(registry);
    }
}

这里我们假设对所有的api接口做拦截，并放行鉴权的接口。