1:首先查看mapper接口跟mapper.xml的映射关系
2:是否加了注解@MapperScan
3:mapper-locations是否配置正确
4:如果xml文件是放在src/main/java下
需在 pom.xml 下配置
<build> <resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> </includes> </resource> </resources> </build>