Create a time blocker yourself

One , Create a class to implement the interface

          Directory structure

  Class inheritance interface

package com.jt.provider.interceptor;

import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.time.LocalTime;

/**
 * Spring MVC  Interceptor object in ,
 *  This object can be used when you execute the target Controller Method is executed before 
 */
public class TimeInterceptor implements HandlerInterceptor {
    /**
     *  This method performs on your goal Controller Method is executed before 
     * @return  Return value true To release , Can continue to execute request Follow up business 
     */
    @Override
    public boolean preHandle(HttpServletRequest request,
                             HttpServletResponse response,
                             Object handler) throws Exception {
        System.out.println("===preHandle===");
        // Business : Allow in 8 After the point , On the evening of 9 Access before 
        LocalTime now = LocalTime.now();// Get the current time ,
        int hour = now.getHour();// Gets the hour unit of the current time 
        if(hour<11||hour>=21)
            throw new RuntimeException(" Please visit at the specified time 11~21");
        return true;
    }
}

Two , Register interceptors

Create a class to implement the interface

package com.jt;

import com.jt.provider.interceptor.TimeInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class SpringWebConfig implements WebMvcConfigurer {
    // Register interceptors 
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new TimeInterceptor())
                .addPathPatterns("/provider/sentinel01");
    }
}

Intercept path

package com.jt.provider.controller;

import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.jt.provider.service.ResourceService;
import org.checkerframework.checker.units.qual.A;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.util.concurrent.atomic.AtomicLong;

@RestController
@RequestMapping("/provider")
public class ProviderSentinelController {
    /**
     *  Current limiting : Completed 
     *  expand : Limit the access time of this method through a design ?( for example 12306 Booking for , Tickets can only be booked at the specified time )
     *  What's your plan ?  be based on springmvc Interceptors in  (15:10 Explain )
     * @return
     */
    @GetMapping("/sentinel01")
    public String doSentinel01(){
        return "sentinel 01 test-------";
    }

3、 ... and , stay pom.xml Add to file sentinel rely on

       

 <!--sentinel rely on , After adding this dependency , An interceptor object will be added to the project , This object will be used for 
         Requests to this service , To intercept , After the request is intercepted, it will be connected with sentinel Compare the current limit rules defined on the console ,
         If it is within the allowable range , Continue to visit , Otherwise, conduct current limiting or degrading operations -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>

Four , test

 1, Set the specified time access

   

2, Access in browser

   

3, Look at the background output