redis缓存,通过spring的aop注解实现

package com.alvis.util;

/**
 * @author ALvis
 * @ctreate 2019/11/25
 */

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;

import java.util.concurrent.TimeUnit;

/**
 * AOP实现Redis缓存处理
 */
@Component
@Aspect
public class RedisAspect {
    private static final Logger LOGGER = LoggerFactory.getLogger(RedisAspect.class);

    @Autowired
    private RedisTemplate redisTemplate;

    /**
     * 拦截所有元注解RedisCache注解的方法
     */
    @Pointcut("@annotation(com.alvis.util.RedisCacheC)")
    public void pointcutMethod(){
    }

    /**
     * 环绕处理,先从Redis里获取缓存,查询不到,就查询MySQL数据库,
     * 然后再保存到Redis缓存里
     * @param joinPoint
     * @return
     */
    @Around("pointcutMethod()")
    public Object around(ProceedingJoinPoint joinPoint){
        //前置:从Redis里获取缓存
        //先获取目标方法参数
        long startTime = System.currentTimeMillis();
        String applId = "";
        Object[] args = joinPoint.getArgs();
        for (Object obj: args) {
            applId = applId +","+ String.valueOf(obj);
        }

        applId = applId.substring(1, applId.length());

        //获取目标方法所在类
        String target = joinPoint.getTarget().toString();
        String className = target.split("@")[0];

        //获取目标方法的方法名称
        String methodName = joinPoint.getSignature().getName();

        //redis中key格式:    applId:方法名称
        String redisKey = applId + ":" + className + "." + methodName;

        Object obj = redisTemplate.opsForValue().get(redisKey);

        if(obj!=null){
            LOGGER.info("**********从Redis中查到了数据**********");
            LOGGER.info("Redis的KEY值:"+redisKey);
            LOGGER.info("REDIS的VALUE值:"+obj.toString());
            return obj;
        }
        long endTime = System.currentTimeMillis();
        LOGGER.info("Redis缓存AOP处理所用时间:"+(endTime-startTime));
        LOGGER.info("**********没有从Redis查到数据**********");
        try{
            obj = joinPoint.proceed();
        }catch(Throwable e){
            e.printStackTrace();
            throw new RuntimeException(e);
        }
        LOGGER.info("**********开始从MySQL查询数据**********");
        //后置:将数据库查到的数据保存到Redis
        redisTemplate.opsForValue().set(redisKey, obj, 5, TimeUnit.MINUTES);

        LOGGER.info("**********数据成功保存到Redis缓存!!!**********");
        LOGGER.info("Redis的KEY值:"+redisKey);
        LOGGER.info("REDIS的VALUE值:"+obj.toString());

        return obj;
    }
}
RedisAspect为切面核心类,可针对自己的项目来写存入key的规则,此例子为demo。
package com.alvis.util;

import java.lang.annotation.*;

/**
 * @author ALvis
 * @ctreate 2019/11/25
 */
@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface RedisCacheC {
    /** 功能 */
    String action() default "";
}
RedisCacheC为自定义注解,里面的参数只写了个功能,如果需要操作可以传入值在aop切面里写逻辑,这里就不多写了,跟一般的注解一样。

 以上为核心类,下面就是应用了,很简单,要想用切面一定要用spring的动态代理才行,也就是说你加注解需要缓存的方法要依赖注入到需要的地方,如下。

    @RedisCacheC
    @Override
    public EvalUser getUser(String name) {
        System.out.println("---------1");
        EvalUser user = new EvalUser();
        user.setUserid("001");
        user.setUsername(name);
        user.setOrgId("111");
        user.setLevel("222");

        return  user;
    }

    @RedisCacheC
    @Override
    public EvalUser getUser22(EvalUser evalUser) {
        System.out.println("---------2");
        EvalUser user = new EvalUser();
        user.setUserid("001");
        user.setUsername("nono");
        user.setOrgId("111");
        user.setLevel("222");

        return  user;
    }

下面是controller 

 @Autowired
 private IUserService iUserService;

 EvalUser user22 = iUserService.getUser("alvis");
 EvalUser user221 = iUserService.getUser22(user22);
 iUserService.getUser22(user221);

 

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