Spring Boot 項目的 API 接口防刷

• 首先是寫一個注解類

• 攔截器中實現

• 注冊到springboot中

• 在Controller中加入注解

• 說明：使用了注解的方式進行對接口防刷的功能，非常高大上，本文章僅供參考 一，技術要點：springboot的基本知識，redis基本操作，

  首先是寫一個注解類：

• 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;
  }

  攔截器

  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 {
  
          //判斷請求是否屬於方法的請求
          if(handler instanceof HandlerMethod){
  
              HandlerMethod hm = (HandlerMethod) handler;
  
              //獲取方法中的注解,看是否有該注解
              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();
              //如果需要登錄
              if(login){
                  //獲取登錄的session進行判斷
                  //.....
                  key+=""+"1";  //這里假設用戶是1,項目中是動態獲取的userId
              }
  
              //從redis中獲取用戶訪問的次數
              AccessKey ak = AccessKey.withExpire(seconds);
              Integer count = redisService.get(ak,key,Integer.class);
              if(count == null){
                  //第一次訪問
                  redisService.set(ak,key,1);
              }else if(count < maxCount){
                  //加1
                  redisService.incr(ak,key);
              }else{
                  //超出訪問次數
                  render(response,CodeMsg.ACCESS_LIMIT_REACHED); //這里的CodeMsg是一個返回參數
                  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();
      }
  }

  注冊到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("請求成功");
  
      }

  相關參考：https://www.jianshu.com/p/364a6f466a2a

•