Spring Boot - Spring Boot 静态资源延迟响应（使用拦截器、使用过滤器、使用 ResourceResolver）

需求概述

yaml 复制代码

spring:
  mvc:
    static-path-pattern: /file/download/**
  web:
    resources:
      static-locations: file:D:/files/

在 Spring Boot 中，在上述静态资源映射的基础上，实现延迟响应，用于测试请求超时

一、使用拦截器

java 复制代码

@Component
public class DelayInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        // 对静态资源请求进行延迟
        if (handler instanceof ResourceHttpRequestHandler) {
            Thread.sleep(20 * 1000);
        }

        return true;
    }
}

java 复制代码

@Configuration
public class WebConfig implements WebMvcConfigurer {

    @Autowired
    private DelayInterceptor delayInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {

        // 配置拦截器
        registry.addInterceptor(delayInterceptor)
                .addPathPatterns("/file/download/**");
    }
}

二、使用过滤器

java 复制代码

@Component
@Order(1)
public class DelayFilter implements Filter {

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest httpRequest = (HttpServletRequest) servletRequest;

        String path = httpRequest.getRequestURI();

        if (path.startsWith("/file/download/")) {
            try {
                Thread.sleep(20 * 1000);
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
            }
        }

        filterChain.doFilter(servletRequest, servletResponse);
    }
}

三、使用 ResourceResolver

java 复制代码

public class DelayResourceResolver extends PathResourceResolver {

    @Override
    protected Resource getResource(String resourcePath, Resource location) throws IOException {
        
        // 对静态资源请求进行延迟
        try {
            Thread.sleep(20000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        return super.getResource(resourcePath, location);
    }
}

java 复制代码

@Configuration
public class WebConfig implements WebMvcConfigurer {

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {

        // 配置 ResourceResolver
        registry.addResourceHandler("/file/download/**")
                .addResourceLocations("file:D:/files/")
                .resourceChain(true)
                .addResolver(new DelayResourceResolver());
    }
}

注：有了上述 WebConfig 配置类，就不需要在 application.yaml 配置文件中配置相关的静态资源映射了