JDBC11 封装+资源配置文件管理

封装为Utils类+程序资源文件去配置

public class Utils {
    static Properties p=null;
            static {
                p=new Properties();
                try {
                    p.load(Thread.currentThread().getContextClassLoader().getResourceAsStream("db.properties"));
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
                try {
                    Class.forName(p.getProperty("mysqlDriver"));
                } catch (ClassNotFoundException e) {
                    e.printStackTrace();
                }
            }
        public static Connection getConn() {
            try {
                return DriverManager.getConnection(p.getProperty("mysqlURL")
                        ,p.getProperty("mysqlUser"),p.getProperty("mysqlpwd"));
            } catch (SQLException e) {
                e.printStackTrace();
            }
            return null;
        }
        public static void close(Connection conn) {
            try {
                if(conn!=null)
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        public static void close(PreparedStatement ps) {
            try {
                if(ps!=null)
                ps.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        public static void close(ResultSet rs) {
            try {
                if(rs!=null)
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        public static void close(Connection conn,PreparedStatement ps,ResultSet rs) {
            close(conn);
            close(ps);
            close(rs);
        }
}

资源文件如下db.properties

mysqlDriver=com.mysql.cj.jdbc.Driver
mysqlURL=jdbc:mysql://localhost:3306/testjdbc?&useSSL=false&serverTimezone=UTC
mysqlUser=root
mysqlpwd=123456

　如果需要调整，只需要更改配置文件中的相关信息