mybatis utils核心配置文件

1.编写一个mybatis.xml配置文件

<?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">
<!--configguration核心配置文件-->
<configuration>
    <!--导入外部配置文件-->
    <properties resource="db.properties">
            <property name="username" value="root"/>
            <property name="password" value="123456"/>
    </properties>

    <!--给实体类起别名-->
    <typeAliases>
        <package name="com.rzk.pojo" />
    </typeAliases>

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <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>
<!--每一个Mapper.xml 都需要在Mybatis核心配置文件中注册-->
    <mappers>
        <mapper resource="com/rzk/dao/UserMapper.xml"/>
    </mappers>

</configuration>

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2.db.properties文件

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/数据库名?userSSL=true&useUnicode=true&characterEncoding=UTF8
username=root
password=123456

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3.写一个工具类
public class MybatisUtils {
    private static SqlSessionFactory sqlSessionFactory;
    static{
        try {
            String resources="mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resources);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static SqlSession getSqlSessionFactory() {
        return sqlSessionFactory.openSession();
    }
}