注解

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface MyRedisCache {
    
    

    String keyPrefix();

    String matchValue();

}

AOP

@Aspect
@Component
public class MyRedisCacheAspect {
    
    


    @Resource
    private RedisTemplate redisTemplate;

    @Pointcut("@annotation(com.deloitte.services.duty.config.MyRedisCache)")
    public void cachePointCut() {
    
    
    }

    @Around("cachePointCut()")
    public Object doCache(ProceedingJoinPoint joinPoint) {
    
    

        Object result = null;

        try {
    
    

            MethodSignature signature = (MethodSignature) joinPoint.getSignature();

            Method method = signature.getMethod();

            MyRedisCache myRedisCache = method.getAnnotation(MyRedisCache.class);

            String keyPrefix = myRedisCache.keyPrefix();

            String matchValueSpringEL = myRedisCache.matchValue();

            ExpressionParser parser = new SpelExpressionParser();

            Expression expression = parser.parseExpression(matchValueSpringEL);

            EvaluationContext context = new StandardEvaluationContext();

            Object[] args = joinPoint.getArgs();

            DefaultParameterNameDiscoverer discoverer = new DefaultParameterNameDiscoverer();

            String[] parameterNames = discoverer.getParameterNames(method);

            for (int i = 0; i < args.length; i++) {
    
    
                System.out.println("获取方法里参数名和值：" + parameterNames[i] + "\t" + args[i]);
                context.setVariable(parameterNames[i], args[i].toString());
            }

            String key = keyPrefix + ":" + expression.getValue(context).toString();

            System.out.println("拼接的redis的key为：" + key);

            result = redisTemplate.opsForValue().get(key);

            if (result != null) {
    
    
                return result;
            }

            result = joinPoint.proceed();

            if (result != null) {
    
    

                redisTemplate.opsForValue().set(key, result);

            }


        } catch (Throwable e) {
    
    
            e.printStackTrace();
        }

        return result;


    }


}