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  • Spring Boot实现接口放刷

    文章来源:微信公众号  架构文摘

    连接:https://mp.weixin.qq.com/s/Z9GsBru6866b4AY1fhWLrA

      技术要点:Spring Boot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;
    
    @Retention(RUNTIME)
    @Target(METHOD)
    public @interface AccessLimit {
    
        /**
         * 秒,限制范围
         */
        int seconds();
    
        /**
         * 最大请求数
         */
        int maxCount();
    
        /**
         * 是否需要登录
         */
        boolean needLogin()default true;
    }

      接着就是在Interceptor拦截器中实现:

    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;
     
    @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();
        }
    }

      再把Interceptor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;
    
    @Configuration
    public class WebConfig extends WebMvcConfigurerAdapter {
     
        @Autowired
        private FangshuaInterceptor interceptor;
     
        @Override
        public void addInterceptors(InterceptorRegistry registry) {
            registry.addInterceptor(interceptor);
        }
    }

      接着在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;
     
    @RestController
    public class FangshuaController {
     
        @AccessLimit(seconds=5, maxCount=5, needLogin=true)
        @RequestMapping("/fangshua")
        @ResponseBody
        public Result<String> fangshua(){
            return Result.success("请求成功");
        }
    }
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  • 原文地址:https://www.cnblogs.com/huanshilang/p/15117288.html
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