這樣寫的時候起作用：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration 
	PUBLIC "-//mybatis.org//DTD Config 3.0//EN"  
	"http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>
	<typeAliases>
		<typeAlias type="com.hc.entity.UserInfo" alias="UserInfo"/>
	</typeAliases>
	<environments default="development">
		<environment id="mysql">
			<transactionManager type="JDBC"/>
			<dataSource type="POOLED">
				<property name="driver" value="com.mysql.jdbc.Driver"/>
				<property name="url" value="jdbc:mysql://localhost:3306/db_mybatis"/>
				<property name="username" value="hhc"/>
				<property name="password" value="******"/>
			</dataSource>
		</environment>
	</environments>
	
	<mappers>
		<mapper resource="com/hc/mapper/UserInfo.xml"/>
	</mappers>
	
</configuration>
 

jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/db_mybatis
jdbc.username=hc
jdbc.password=123456

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration 
	PUBLIC "-//mybatis.org//DTD Config 3.0//EN"  
	"http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>
	<properties resource="jdbc.properties"/>
	<typeAliases>
		<typeAlias type="com.hc.entity.UserInfo" alias="UserInfo"/>
	</typeAliases>
	<environments default="development">
		<environment id="mysql">
			<transactionManager type="JDBC"></transactionManager>
			<dataSource type="POOLED">
				<property name="driver" value="${jdbc.driverClass}"/>
				<property name="url" value="${jdbc.url}"/>
				<property name="username" value="${jdbc.username}"/>
				<property name="password" value="${jdbc.password}"/>
			</dataSource>
		</environment>
	</environments>
	<mappers>
		<mapper resource="com/hc/mapper/userinfo.xml"/>
	</mappers>
</configuration>
 

    1.在jdbc.properties滑鼠右鍵Properties(屬性)，把ISO-8859-1更改為UTF-8 

    2.在整個專案滑鼠右鍵，把ISO-8859-1更改為UTF-8   具體操作如下圖