今天在使用Spring cache的Cacheable注解的过程中遇见了一个Cacheable注解失效的问题，检查问题发生的原因是因为Spring的Cacheable注解是基于Spring AOP实现的，但是类内部方法互相调用时不会被Spring AOP拦截的，所以导致被调用方法的Cacheable注解失效，特此记录。

问题复现

@Servicepublic class UserServiceImpl{ @Override public User detail(Long id) { // 校验信息 if (id == null || id == 0) { return ApiResult.instance().fail(UserResultEnum.USER_ID_NULL); } User user = this.selectById(id); if (user == null) { return ApiResult.instance().fail(UserResultEnum.USER_NULL); } return user; } @Override @Cacheable(value = "user",condition = "#id != null", key = "'user'.concat(#id.toString())") public User selectById(Serializable id){ return super.selectById(id); } }

上述代码在使用this.selectById的时候Cacheable注解是无效的，解决办法如下：

• 写一个工具类SpringContextUtil实现ApplicationContextAware接口

public class SpringContextUtil implements ApplicationContextAware { private static ApplicationContext applicationContext; @Override public void setApplicationContext(ApplicationContext applicationContext){ SpringContextUtil.applicationContext = applicationContext; } public static ApplicationContext getApplicationContext(){ return applicationContext; } public static Object getBean(Class var1) throws BeansException { return applicationContext.getBean(var1); } }

• 在Spring Boot启动的时候将ApplicationContext注入SpringContextUtil

public class AuthServiceApplication {    public static void main(String[] args) { SpringContextUtil springContextUtil = new SpringContextUtil(); ApplicationContext applicationContext = SpringApplication.run(AuthServiceApplication.class, args); springContextUtil.setApplicationContext(applicationContext); } }

• 在UserServiceImpl方法中使用

@Servicepublic class UserServiceImpl{ @Override public User detail(Long id) { // 校验信息 if (id == null || id == 0) { return ApiResult.instance().fail(UserResultEnum.USER_ID_NULL); } //注入当前Bean使得调用内部方法也被SpringAOP拦截 IUserService userService = (IUserService) SpringContextUtil.getBean(this.getClass()); User user = userService.selectById(id); if (user == null) { return ApiResult.instance().fail(UserResultEnum.USER_NULL); } return user; } @Override @Cacheable(value = "user",condition = "#id != null", key = "'user'.concat(#id.toString())") public User selectById(Serializable id){ return super.selectById(id); } }

这样就可以解决Bean内部方法调用不被Spring AOP拦截的问题