这个错误很长，
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'studentController': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'addStudentImpl': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'studentMapper' defined in file [D:JAVApracticespringbootspringboot-08-generater了两边，xml中所有语句都写了两次targetclassescomzhibodaoStudentMapper.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException:
其中，最重要的一句话是：
Cause: java.lang.IllegalArgumentException: Result Maps collection already contains value for com.zhibo.dao.StudentMapper.BaseResultMap
这是因为：在使用mybatis-generator的时候，点击了两遍generate，导致生成的mapper文件中，每条sql语句都写了两遍，所以出现了Result Maps collection already contains value的错误。
解决办法：删掉自动生成的xml文件，并重新生成即可。或者自己手动把下面第二遍生成的内容给删了。
