SpringBoot Redis 缓存失效设置（手写）

小灰灰 2022-05-20 03:24 197阅读 0赞

第一步

//创建一个注解
    @Target({ElementType.METHOD})
    @Retention(RetentionPolicy.RUNTIME)
    public @interface RedisCache {
         String Value() default "";
         long time() default 0L;
    }

第二步写一个拦截器

@Aspect
    @Order(1) //拦截器执行顺序
    @Component
    public class Interceptor {
    
        /**
         * redis 模板注入
         */
        @Resource
        private RedisTemplate<String, Object> redisTemplate;
    
        @Pointcut("@annotation(redisCache)")
        public void pointCut(RedisCache redisCache) {}
    
        /**
         * 环绕通知
         * @param proceedingJoinPoint
         * @param redisCache
         * @return
         * @throws Throwable
         */
        @Around("pointCut(redisCache)")
        public Object around(ProceedingJoinPoint proceedingJoinPoint,RedisCache redisCache) throws Throwable {
            //目标方法执行前
            String value = redisCache.Value();
            // 查询redis数据 
            // ResponseData 封装一个类用来接收返回数据
            ResponseData result = (ResponseData) redisTemplate.opsForValue().get(value);
            if(null == result || result.getCode() != 200){
                //执行目标方法
                result = (ResponseData) proceedingJoinPoint.proceed();
                //目标方法执行后
                long time = redisCache.time();
                if (time > 0L)
                    redisTemplate.opsForValue().set(value,result, time, TimeUnit.MILLISECONDS);
                else if(time <= 0L)
                    redisTemplate.opsForValue().set(value,result);
            }
            return result;
        }
    
    }

测试

//value 缓存 key值 time 时间毫秒
     @RedisCache(Value = "value",time = 15000)
     @GetMapping("/index")
     public ResponseData getIndex() {
        System.out.println("执行方法了");
        return ResponseData.success("123213");
     }

封装

public class ResponseData {
    
        private boolean isSuccess;
    
        private int code;
    
        private Object body;
    
        public ResponseData() {}
    
        private ResponseData(boolean isSuccess, Object body) {
            this.isSuccess = isSuccess;
            this.body = body;
        }
    
        public static ResponseData success(Object body) {
            return new ResponseData(200,body);
        }
    
    }