正文
结合spring 实现自定义注解
小程序:扫一扫查出行
【扫一扫了解最新限行尾号】
复制小程序
【扫一扫了解最新限行尾号】
复制小程序
注解类
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;
}
注解实现类
@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; }
}
调用类
@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;
}
}
}