How Java connects to Oracle database

Static Connection getconnectionnew () {
Connection con = null;
Configer Configer = new Configer (New File ("Conf.ini"));
////debug=0: Publish tomcat mode, normal customer used mode
////debug=1: Develop debug mode, do not send network command, call Local Service directly, all code is executed at client
// Defaultnpparam.debug = 1;
//defaultnpparam.develop = 1;
//
//defaultnpparam.debugdbip = configer.get ("IP");
Defaultnpparam.debugdbsid = Configer.get ("Sid");
//defaultnpparam.debugdbusrname = configer.get ("user");
//defaultnpparam.debugdbpasswd = configer.get ("Pass");
//string port = configer.get ("port");


Try {
Class.forName ("Oracle.jdbc.driver.OracleDriver");
String url = "jdbc:oracle:thin:@" + Debugdbip
+ ":" +port+ ":" + debugdbsid;

con = drivermanager.getconnection (URL, debugdbusrname,debugdbpasswd);
Con.setautocommit (FALSE);
Loginfo ("Debug", "System", "database connection succeeded.") ");
} catch (Exception E1) {
Loginfo ("Error", "System", "Unable to get database connection, make sure database is started, and can access!") Error message: \ n "+ e1.getmessage ());
}

return con;
}

How Java connects to an Oracle database