出现这个问题要先看你的mapper映射文件xml文件写在那里
如果在resource中你要检查你的xml文件与mapper接口的包的路径是否相同
例如:mapper在src下的com.a.b.mapper
那么在resource中也要有com.a.b.mapper
如果你写在src中与mapper接口写在一起要在pom文件中加
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
配置在