Field userService in com.wuji.controller.UserController required a bean of type 'com.wuji.service.UserService' that could not be found.
原因：说明IOC里没有创建Bean，在启动文件上手动添加：@ComponentScan(basePackages = {"com.wuji"})注解开启Spring组件扫描
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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