<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>springbootRefusePost</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>RELEASE</version>
            <scope>compile</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
            <version>2.3.0.RELEASE</version>
        </dependency>


        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.67</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.13.1</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <version>2.3.3.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.3.3.RELEASE</version>
        </dependency>
    </dependencies>

</project>

package com.ApiTest;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * 自定義注解，用于攔截過于頻繁的請求
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface AccessLimit {
    int seconds();
    int maxCount();
    boolean needLogin() default true;
}

package com.ApiTest;

import com.ApiTest.MyException;
import com.ApiTest.AccessLimit;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.concurrent.TimeUnit;

/**
 * 自定義攔截器
 */
@Component
public class AccessLimtInterceptor implements HandlerInterceptor {

    @Autowired
    private RedisTemplate redisTemplate;

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

        if (handler instanceof HandlerMethod) {
            HandlerMethod hm = (HandlerMethod) handler;
            AccessLimit accessLimit = hm.getMethodAnnotation(AccessLimit.class);
            if (null == accessLimit) {
                return true;
            }
            int seconds = accessLimit.seconds();
            int maxCount = accessLimit.maxCount();
            boolean needLogin = accessLimit.needLogin();

            if (needLogin) {
                //判斷是否登錄
            }
            String ip=request.getRemoteAddr();
            String key = request.getServletPath() + ":" + ip ;
            System.out.println(ip);
            System.out.println(key);
            //獲取key鍵對應(yīng)的值。
            Integer count = (Integer) redisTemplate.opsForValue().get(key);
            System.out.println(count);
            if (null == count || -1 == count) {
                //redisTemplate.opsForValue().set  增?個字符串類型的值，key是鍵，value是值。
                //?法含義：新增?個字符串類型的值，并且設(shè)置變量值的過期時間。key是鍵，value是值，timeout 過期時間，unit 過期時間單位
                //鏈接：https://wenku.baidu.com/view/f0de3ecc1ae8b8f67c1cfad6195f312b3169ebd1.html
                System.out.println("初次進入");
                redisTemplate.opsForValue().set(key, 1,seconds, TimeUnit.SECONDS);
                return true;
            }

            if (count < maxCount) {
                count = count+1;
                //?法含義：覆蓋從指定位置開始的值
                redisTemplate.opsForValue().set(key, count,0);
                return true;
            }
            //  response 返回 json 請求過于頻繁請稍后再試
            throw new MyException("20001","操作過于頻繁");
        }

        return true;
    }
}

package com.ApiTest;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class AppHomeController {


    @GetMapping("/index")
    @AccessLimit(seconds = 2, maxCount = 5) //2秒內(nèi) 允許請求5次
    @ResponseBody
    public String getImageList(){
        return "請求成功";
    }
}

package com.ApiTest;

/**
 * 自定義異常類
 */
public class MyException extends Exception {
    // 異常代碼
    private String code;

    //異常信息
    private String message;

    //構(gòu)造方法


    public MyException(String code, String message) {
        this.code = code;
        this.message = message;
    }

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    @Override
    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }


}

package com.ApiTest;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

/**
 * 在webconfig中配置攔截器
 */
@Configuration
public class MyWebMvcConfigurer extends WebMvcConfigurerAdapter {

    @Autowired
    private AccessLimtInterceptor accessLimtInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(accessLimtInterceptor);
        super.addInterceptors(registry);
    }
}


```java
package com;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
public class Application {

    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}