1.创建Maven项目

2.导入SQL server依赖

低版本的SQL server无法直接用maven仓库导入，需要使用新版依赖。

 <dependency>
        <groupId>com.microsoft.sqlserver</groupId>
        <artifactId>mssql-jdbc</artifactId>
        <version>6.1.0.jre8</version>
    </dependency> 

3.将jdbc.properties文件放入resources文件夹下

配置文件代码：
user=sa
password=Zd@123
url=jdbc:sqlserver://127.0.0.1:1433;DatabaseName=DD
driverClass=com.microsoft.sqlserver.jdbc.SQLServerDriver

4.连接测试代码

public class ConnectionTest {
    @Test
    public void testConnection() throws Exception {
        //1.读取配置文件中的4个基本信息
        InputStream is = ConnectionTest.class.getClassLoader().getResourceAsStream("jdbc.properties");

        Properties properties = new Properties();
        properties.load(is);

        String user = properties.getProperty("user");
        String password = properties.getProperty("password");
        String url = properties.getProperty("url");
        String driverClass = properties.getProperty("driverClass");

        System.out.println(user+password+url+driverClass);

        //2.加载驱动
        Class.forName(driverClass);

        //3.获取连接
        Connection conn = DriverManager.getConnection(url, user, password);
        System.out.println(conn);
    }
} 

5.获取连接测试