java使用JDBC鏈接數據庫的幾種方式

/**

* 1 在方法中固化鏈接參數

* 

* @return 數據庫鏈接

*/

public Connection getConnection() {

Connection conn = null;

try {

Class.forName("com.mysql.jdbc.Driver");

conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "");

return conn;

} catch (Exception e) {

e.printStackTrace();

}

return null;

}

/**

* 2 經過方法參數方式傳遞鏈接參數

* 

* @return 數據庫鏈接

*/

public Connection getConnection(String driver, String url, String user, String password) {

Connection conn = null;

try {

Class.forName(driver);

conn = DriverManager.getConnection(url, user, password);

return conn;

} catch (Exception e) {

e.printStackTrace();

}

return null;

}

/**

* 3 經過properties配置文件的方式靈活配置鏈接參數，properties中的屬性名固化

* 

* @return 數據庫鏈接

*/

public Connection openConnection() {

Connection conn = null;

String driver = "";

String url = "";

String user = "";

String password = "";

Properties props = new Properties();

try {

props.load(this.getClass().getClassLoader()

.getResourceAsStream("db.properties"));

url = props.getProperty("mysql_url");

driver = props.getProperty("mysql_driver");

user = props.getProperty("mysql_user");

password = props.getProperty("mysql_password");

Class.forName(driver);

conn = DriverManager.getConnection(url, user, password);

return conn;

} catch (Exception e) {

e.printStackTrace();

}

return null;

}