Spring Boot 项目的 API 接口防刷

• 首先是写一个注解类

• 拦截器中实现

• 注册到springboot中

• 在Controller中加入注解

• 说明：使用了注解的方式进行对接口防刷的功能，非常高大上，本文章仅供参考 一，技术要点：springboot的基本知识，redis基本操作，

  首先是写一个注解类：

• import java.lang.annotation.Retention;
  import java.lang.annotation.Target;
  
  import static java.lang.annotation.ElementType.METHOD;
  import static java.lang.annotation.RetentionPolicy.RUNTIME;
  
  /**
   * @author yhq
   * @date 2018/9/10 15:52
   */
  
  @Retention(RUNTIME)
  @Target(METHOD)
  public @interface AccessLimit {
  
      int seconds();
      int maxCount();
      boolean needLogin()default true;
  }

  拦截器

  import com.alibaba.fastjson.JSON;
  import com.example.demo.action.AccessLimit;
  import com.example.demo.redis.RedisService;
  import com.example.demo.result.CodeMsg;
  import com.example.demo.result.Result;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.stereotype.Component;
  import org.springframework.web.method.HandlerMethod;
  import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  import java.io.OutputStream;
  
  /**
   * @author yhq
   * @date 2018/9/10 16:05
   */
  
  
  @Component
  public class FangshuaInterceptor extends HandlerInterceptorAdapter {
  
      @Autowired
      private RedisService redisService;
  
      @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 hm = (HandlerMethod) handler;
  
              //获取方法中的注解,看是否有该注解
              AccessLimit accessLimit = hm.getMethodAnnotation(AccessLimit.class);
              if(accessLimit == null){
                  return true;
              }
              int seconds = accessLimit.seconds();
              int maxCount = accessLimit.maxCount();
              boolean login = accessLimit.needLogin();
              String key = request.getRequestURI();
              //如果需要登录
              if(login){
                  //获取登录的session进行判断
                  //.....
                  key+=""+"1";  //这里假设用户是1,项目中是动态获取的userId
              }
  
              //从redis中获取用户访问的次数
              AccessKey ak = AccessKey.withExpire(seconds);
              Integer count = redisService.get(ak,key,Integer.class);
              if(count == null){
                  //第一次访问
                  redisService.set(ak,key,1);
              }else if(count < maxCount){
                  //加1
                  redisService.incr(ak,key);
              }else{
                  //超出访问次数
                  render(response,CodeMsg.ACCESS_LIMIT_REACHED); //这里的CodeMsg是一个返回参数
                  return false;
              }
          }
  
          return true;
  
      }
      private void render(HttpServletResponse response, CodeMsg cm)throws Exception {
          response.setContentType("application/json;charset=UTF-8");
          OutputStream out = response.getOutputStream();
          String str  = JSON.toJSONString(Result.error(cm));
          out.write(str.getBytes("UTF-8"));
          out.flush();
          out.close();
      }
  }

  注册到springboot中

  import com.example.demo.ExceptionHander.FangshuaInterceptor;
  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;
  
  /**
   * @author yhq
   * @date 2018/9/10 15:58
   */
  @Configuration
  public class WebConfig extends WebMvcConfigurerAdapter {
  
      @Autowired
      private FangshuaInterceptor interceptor;
  
  
      @Override
      public void addInterceptors(InterceptorRegistry registry) {
          registry.addInterceptor(interceptor);
      }
  }

  在Controller中加入注解

• import com.example.demo.result.Result;
  import org.springframework.stereotype.Controller;
  import org.springframework.web.bind.annotation.RequestMapping;
  import org.springframework.web.bind.annotation.ResponseBody;
  
  /**
   * @author yhq
   * @date 2018/9/10 15:49
   */
  
  @Controller
  public class FangshuaController {
  
      @AccessLimit(seconds=5, maxCount=5, needLogin=true)
      @RequestMapping("/fangshua")
      @ResponseBody
      public Result<String> fangshua(){
  
  
          return Result.success("请求成功");
  
      }

  相关参考：https://www.jianshu.com/p/364a6f466a2a

•