Spring Boot project API interface anti-brush

• First class is to write a comment

• Interceptor implemented

• Sign in to springboot

• Add comments in the Controller

• Description: Use annotations on the way the interface anti brush function, a very tall, this article is only a reference, technical points: basic knowledge of springboot, redis basic operations,

  The first is to write a comment like:

• 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;
  }

  Interceptor

  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;
  
              //Acquiring annotation methods to see if the notes 
              AccessLimit accessLimit = hm.getMethodAnnotation (AccessLimit. Class );
               IF (accessLimit == null ) {
                   return  to true ; 
              } 
              int seconds The = accessLimit.seconds ();
               int maxCount = accessLimit.maxCount ();
               Boolean Login = accessLimit.needLogin (); 
              String Key = Request.getRequestURI ();
               // if desired log 
              IF (Login) {
                   // Get the determination login session
                   //..... 
                  Key + = "" + "1";   // assumed that the user is 1, the program is dynamically acquired the userId 
              } 
  
              // number of times the user accessed from redis acquired in 
              the AccessKey AK = AccessKey.withExpire (seconds The); 
              COUNT Integer = redisService.get (AK, Key, Integer. class );
               IF (COUNT == null ) {
                   // first access 
                  redisService.set (AK, Key,. 1 ); 
              } the else  IF (COUNT < maxCount) {
                   // add. 1 
                  redisService.incr (AK, Key); 
              } the 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();
      }
  }

  Sign in to springboot

  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);
      }
  }

  Add comments in the Controller

• 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(){
  
  
          returnResult.success ( "request was successful" ); 
  
      }

  Related reference: https://www.jianshu.com/p/364a6f466a2a

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