java jdbc连接数据库的 3 种方式

方法1：

private String driver="oracle.jdbc.driver.OracleDriver";
private String url="jdbc:oracle:thin:@wyc:1521:orcl";
private String user="wyc";
private String password="o123";
private Connection conn =null;
Class.forName(driver);
conn=DriverManager.getConnection(url, user, password);

方法2：

String url="jdbc:oracle:thin@localhost:1521:orcl";
String name="wyc";
String password="o123";
//-Djdbc.drivers=oracle.jdbc.driver.OracleDriver
//System.setProperty("jdbc.drivers", driver);
//Class.forName(driver);
Connection conn= DriverManager.getConnection(url, name, password);

方法3：

String url="jdbc:oracle:thin@localhost:1521:orcl";
String name="wyc";
String password="o123";
Driver d =new OracleDriver();
Connection conn= DriverManager.getConnection(url, name, password);

待续。。。