java cdn加速器

// 假设使用Spring Boot框架
@Configuration
public class CdnConfig {
    @Bean
    public FilterRegistrationBean<CdnFilter> cdnFilter() {
        FilterRegistrationBean<CdnFilter> registration = new FilterRegistrationBean<>();
        registration.setFilter(new CdnFilter());
        registration.addUrlPatterns("/*");
        return registration;
    }
}

public class CdnFilter implements Filter {
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) request;
        HttpServletResponse res = (HttpServletResponse) response;
        
        // 获取请求的资源URL
        String url = req.getRequestURL().toString();
        
        // 判断资源是否需要通过CDN加速
        if (shouldUseCdn(url)) {
            // 重定向到CDN地址
            res.sendRedirect(getCdnUrl(url));
            return;
        }
        
        chain.doFilter(request, response);
    }
    
    private boolean shouldUseCdn(String url) {
        // 根据实际需求判断是否使用CDN加速
        return url.contains("/static/");
    }
    
    private String getCdnUrl(String url) {
        // 替换为实际的CDN地址
        return "https://cdn.example.com" + url.substring(url.indexOf("/static/"));
    }
}