先放出我遇到的出错信息，真的出错了可以先看看出错信息，就能更加高效准确的搜索到信息

我的报错日志：

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'loginController': Unsatisfied dependency expressed through field 'adminServiceimpl'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'adminServiceImpl': Unsatisfied dependency expressed through field 'myMapper'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'myMapper' defined in file [D:\Program Data\Java_workbench\idea\demo\target\classes\com\example\demo\Mapper\MyMapper.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [D:\Program Data\Java_workbench\idea\demo\target\classes\mapper\AdminMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [D:\Program Data\Java_workbench\idea\demo\target\classes\mapper\AdminMapper.xml]'. Cause: java.lang.IllegalArgumentException: Result Maps collection already contains value for com.example.demo.Mapper.AdminMapper.BaseResultMap

关键在于红色这一行，这个说我的映射关系已经存在，这一个就说明我极有可能是重复声明了映射关系，也就是mapper，检查发现我在application.properties文件和自己配置的mybatis配置文件中都有说明mapper的位置，这样会导致对mapper的重复扫描，因此注释掉其中一个即可，我直接注释掉application.properties里的

mybatis.mapper-locations=classpath:mapper/*.xml

注释掉这一行即可

（记得报错信息着重看最后的报错信息，因为异常捕获是从上而下的，最后的才是最底层的报错，也更准确）