### 用法一：修改SqlMapConfig.xml ```xml <?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> <property name="driver" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/mybatis"/> <property name="username" value="root"/> <property name="password" value="root"/> </properties> <environments default="dev"> <environment id="dev"> <transactionManager type="JDBC"></transactionManager> <dataSource type="POOLED"> <property name="driver" value="${driver}"/> <property name="url" value="${url}"/> <property name="username" value="${username}"/> <property name="password" value="${password}"/> </dataSource> </environment> </environments> <mappers> <mapper resource="com/gosuncn/dao/UserMapper.xml"/> </mappers> </configuration> ``` ### 用法二：引用外部配置文件 ##### 在`resources`新增`mysql.properties` ```properties driver=com.mysql.jdbc.Driver url=jdbc:mysql://localhost:3306/mybatis username=root password=root ``` ##### 修改SqlMapConfig.xml > `resource`属性 ```xml <?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="mysql.properties"/> <environments default="dev"> <environment id="dev"> <transactionManager type="JDBC"></transactionManager> <dataSource type="POOLED"> <property name="driver" value="${driver}"/> <property name="url" value="${url}"/> <property name="username" value="${username}"/> <property name="password" value="${password}"/> </dataSource> </environment> </environments> <mappers> <mapper resource="com/gosuncn/dao/UserMapper.xml"/> </mappers> </configuration> ``` ##### url属性 > 协议 主机 端口 URI http://localhost:8088/config/datasource 协议：http 主机：localhost 端口：8088 URI：/config/datasource 文件协议：file:///D:/mybatis/src/main/resources/mysql.properties ##### resource属性 相对于类路径