Spring Cloud微服务安全实战_6-4_限流的改造

例子使用Guava的限流框架

GatewayRateLimitFilter ：

/**
 * 限流过滤器
 */
public class GatewayRateLimitFilter extends OncePerRequestFilter {

    private RateLimiter rateLimiter = RateLimiter.create(1);

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        System.err.println("0 rate  limit ");

        if(rateLimiter.tryAcquire()){
            filterChain.doFilter(request,response);
        }else {
            response.setStatus(HttpStatus.TOO_MANY_REQUESTS.value());
            response.setContentType("application/json");
            response.getWriter().write("{\"error\":\"too many request\"}");
            response.getWriter().flush();
            return;
        }
    }
}

限流过滤器，加载SpringSecurity过滤器链的第一个过滤器前
　　

 完成。

代码：https://github.com/lhy1234/springcloud-security/tree/chapt-6-5-ratelimit

第六章总结