结合spring 实现自定义注解

import java.lang.annotation.*;

/**
* Created by Administrator on 2016/6/28.
*/
//ElementType.METHOD 在方法上使用
@Target(ElementType.METHOD)
//范围
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Cacheable {

String key();
String fieldKey() ;
int expireTime() default 1800000;
}

@Aspect
public class CacheAspect {

private Logger logger = LoggerFactory.getLogger(CacheAspect.class);

public CacheAspect(){
}

@Pointcut(value = "execution(@Cacheable * *.*(..))")
public void setCacheRedis(){}

/**
* aop实现自定缓存注解
*
* @param joinPoint
* @return
*/

//@Around("@annotation(com.manage.annotations.Cacheable)")  不知道为什么这么写不行
　　//这个里面的值要上面的方法名一致
@Around("setCacheRedis()")
public Object setCache(ProceedingJoinPoint joinPoint) {
Object result = null;

Method method = getMethod(joinPoint);

　　　　　//自定义注解类
Cacheable cacheable = method.getAnnotation(Cacheable.class);
　　　　　//获取key值　
　　　　　String key = cacheable.key();
　　　　　String fieldKey=cacheable.fieldKey();
　　　　　　 　
//获取方法的返回类型,让缓存可以返回正确的类型
Class returnType=((MethodSignature)joinPoint.getSignature()).getReturnType();
　　　　
　　　　　下面就是根据业务来自行操作　
return result;
}
public Method getMethod(ProceedingJoinPoint pjp) {
//获取参数的类型
Object[] args = pjp.getArgs();
Class[] argTypes = new Class[pjp.getArgs().length];
for (int i = 0; i < args.length; i++) {
argTypes[i] = args[i].getClass();
}
Method method = null;
try {
method = pjp.getTarget().getClass().getMethod(pjp.getSignature().getName(), argTypes);
} catch (NoSuchMethodException e) {
logger.error("annotation no sucheMehtod", e);
} catch (SecurityException e) {
logger.error("annotation SecurityException", e);
}
return method;

}
}　　

@Service
@Transactional
public class UserServiceImpl extends BaseServiceImpl<User, Integer> implements UserService {

@Autowired
private UserDaoImpl userDaoImpl;

@Override
//key名字自定义  fieldKey可以看Spring EL表达式
@Cacheable(key = "getUser",fieldKey = "#user.getUserName()")
public User getUser(User user) {
List<User> users = userDaoImpl.getUser(user);
if (!users.isEmpty() && users.size() > 0) {
user=users.get(0);
return user;
} else {
return null;
}
}
}