出现的原因是
src文件下的mapper有mapper接口和映射文件,而target下的mapper文件却没有映射文件
===========================解决方案==================================
1.把映射文件 放到resources 目录下 结构目录一模一样
2.在pom.xml中导入以下代码
<build> <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>**/*.*</include> </includes> <filtering>false</filtering> </resource> </resources> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build>