mybatis找不到mapper中的方法
解决方法：
1.在pom文件加上

<build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>

2.在application.properties中添加

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