Field userService in com.wuji.controller.UserController required a bean of type 'com.wuji.service.UserService' that could not be found.
原因：說明IOC里沒有創建Bean，在啟動文件上手動添加：@ComponentScan(basePackages = {"com.wuji"})注解開啟Spring組件掃描
Field userService in com.wuji.controller.UserController required a bean of type 'com.wuji.service.UserService' that could not be found
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