Springboot项目的接口防刷，防止重复多次调用

说明

用了注解的方式进行对接口防刷的功能,防止重复多次调用

注解类

package cn.yepk.cases.access.annotation;

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

/**
 * @author :yepk
 * @version :1.0
 * @apiNote :访问限制注解
 * @date :2021-02-07-15:46
 */

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface AccessLimit {
    /**
     * 秒值
     **/
    int seconds();
    /**
     * 秒值中最大访问次数
     **/
    int maxCount();
}

拦截器中实现

package cn.yepk.cases.access.interceptor;

import cn.yepk.cases.access.annotation.AccessLimit;
import cn.yepk.cases.access.domain.Result;
import cn.yepk.cases.access.util.RedisUtil;
import com.alibaba.fastjson.JSON;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;

/**
 * @author :yepk
 * @version :1.0
 * @apiNote :访问控制拦截器
 * @date :2021-02-07-15:48
 */
@Component
public class AccessInterceptor extends HandlerInterceptorAdapter {
    @Resource
    private RedisUtil redisUtil;
    
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断请求是否属于方法的请求
        if (handler instanceof HandlerMethod) {
            HandlerMethod method = (HandlerMethod) handler;
            //获取方法中的注解,看是否有该注解
            AccessLimit accessLimit = method.getMethodAnnotation(AccessLimit.class);
            if (accessLimit == null) {
                return true;
            }
            int seconds = accessLimit.seconds();
            int maxCount = accessLimit.maxCount();
            String key = "ACCESS:" + request.getRequestURI();
            
            //从redis中获取用户访问的次数
            Integer count = (Integer) redisUtil.getV(key);
            if (count == null) {
                //第一次访问 设置访问次数1  seconds秒释放
                redisUtil.set(key,1, seconds);
            } else if (count < maxCount) {
                //加1
                redisUtil.incr(key, 1);
            } else {
                //超出访问次数
                render(response, new Result().setError("重复访问", "400"));
                return false;
            }
        }

        return true;
    }

    private void render(HttpServletResponse response, Result code) throws Exception {
        response.setContentType("application/json;charset=UTF-8");
        OutputStream out = response.getOutputStream();
        String str = JSON.toJSONString(code);
        out.write(str.getBytes(StandardCharsets.UTF_8));
        out.flush();
        out.close();
    }
}

注册拦截器

package cn.yepk.cases.access.config;

import cn.yepk.cases.access.interceptor.AccessInterceptor;
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.WebMvcConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import javax.annotation.Resource;

/**
 * @author :yepk
 * @version :1.0
 * @apiNote :web配置
 * @date :2021-02-07-15:55
 */
@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Resource
    private AccessInterceptor interceptor;
    
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(interceptor);
    }
}

接口测试

package cn.yepk.cases.access.controller;

import cn.yepk.cases.access.annotation.AccessLimit;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * @author :yepk
 * @version :1.0
 * @apiNote :测试接口
 * @date :2020-11-26-10:52
 */
@RequestMapping(value = "test", produces = "application/json;charset=utf-8")
@RestController
public class TestController {

    @GetMapping(value = "index")
    @AccessLimit(maxCount = 5, seconds = 5)
    public String test() {
        return "{code:200}";
    }
}

效果

后续推展

如果是限制单个用户或单个ip，redis键加上用户id或ip即可

工具类

redisUtil工具类