org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: java.sql.SQLException: Unknown initial character set index '255' received from server. Initial client character set can be forced via the 'characterEncoding' property.
### The error may exist in com/lsw/dao/DeptDao.xml
### The error may involve com.lsw.dao.selectAllDept

运行项目时发现如上错误，首先我分析的是由于找不到xml文件导致的报错，于是就去设置mapper文件路径，发现不行，于是就动手去配置maven的pom文件配置，在<build>节点下添加<resources>代码：

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

发现依然不能work，后来在检测pom文件时发现 我本机用的sql版本跟我设置的版本不一样，折腾了一个小时多才发现是我的mysql-connector-java.jar包版本过低，换一个匹配版本的jar包即可