Cache统一缓存处理（优化）利用aop切面技术

新建Cache注解

import java.lang.annotation.*;

@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Cache {
    //缓存存储时间
    long expire() default 1 * 60 * 1000;
    //缓存标识 key
    String name() default "";

}

 

CacheAspect配置类 aop切面

//aop 定义一个切面，切面定义了切点和通知的关系
@Aspect
@Component
@Slf4j
public class CacheAspect {

    private static final ObjectMapper objectMapper = new ObjectMapper();


    @Autowired
    private RedisTemplate<String, String> redisTemplate;

　　//切面
    @Pointcut("@annotation(com.he.blogapi.common.cache.Cache)")
    public void pt(){}

    @Around("pt()")
    public Object around(ProceedingJoinPoint pjp){
        try {
            Signature signature = pjp.getSignature();
            //类名
            String className = pjp.getTarget().getClass().getSimpleName();
            //调用的方法名
            String methodName = signature.getName();


            Class[] parameterTypes = new Class[pjp.getArgs().length];
            Object[] args = pjp.getArgs();
            //参数
            String params = "";
            for(int i=0; i<args.length; i++) {
                if(args[i] != null) {
                    params += JSON.toJSONString(args[i]);
                    parameterTypes[i] = args[i].getClass();
                }else {
                    parameterTypes[i] = null;
                }
            }
            if (StringUtils.isNotEmpty(params)) {
                //加密 以防出现key过长以及字符转义获取不到的情况
                params = DigestUtils.md5Hex(params);
            }
            Method method = pjp.getSignature().getDeclaringType().getMethod(methodName, parameterTypes);
            //获取Cache注解
            Cache annotation = method.getAnnotation(Cache.class);
            //缓存过期时间
            long expire = annotation.expire();
            //缓存名称
            String name = annotation.name();
            //先从redis获取
            String redisKey = name + "::" + className+"::"+methodName+"::"+params;
            String redisValue = redisTemplate.opsForValue().get(redisKey);
            if (StringUtils.isNotEmpty(redisValue)){
                log.info("走了缓存~~~,{}",redisKey);
                Result result = JSON.parseObject(redisValue, Result.class);
                return result;
            }
            Object proceed = pjp.proceed();
            redisTemplate.opsForValue().set(redisKey,JSON.toJSONString(proceed), Duration.ofMillis(expire));
            log.info("存入缓存~~~ {},{}",className,methodName);
            return proceed;
        } catch (Throwable throwable) {
            throwable.printStackTrace();
        }
        return Result.fail(-999,"系统错误");
    }

}

 

Controller使用@Cache注解

    @Cache(name="hotArticle",expire=5*60*1000)