java出现Error creating bean with name xxController Unsatisfied dependency expressed through fieldxx

java编写项目时出现Error creating bean with name 'xxController': Unsatisfied dependency expressed through field'xxx' 今天在写项目时，遇到了一个500的错误，废话不多说，直接上图 错误信息如下： Error creating bean with name ‘mainController’: Unsa

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