1.获取连接
1)读取配置文件中的四个基本信息
a.将配置文件转换成字流 InputStream is = ClassLoader.getSystemClassLoader().getResourceAsStream("jdbc.properties");
b.将资源加载 Properties pros = new Properties(); pros.load(is);
c.分别接收四个基本信息
String user = pros.getProperty("user");
String password = pros.getProperty("password");
String url = pros.getProperty("url");
String driver = pros.getProperty("driver");
2)加载驱动 Class.forName(driver);
3)获取连接 Connection con = DriverManager.getConnection(url, user, password);
2.预编译
3.填充占位符
4.执行
5//...具体操作
「jdbc.properties」
user=root
password={*******}
url=jdbc:mysql://localhost:3306/test?useSSL=false&serverTimezone=UTC
#url=jdbc:mysql://127.0.0.1:3306/test?user=root&password={******}&useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
driver=com.mysql.cj.jdbc.Driver