package myjdbc;import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.InvalidPropertiesFormatException;
import java.util.Properties;public class myjdbcutil {public String dbms;public String dbName; public String userName;public String password;private String serverName;private int portNumber;private Properties prop;public myjdbcutil(String filename) throws FileNotFoundException, InvalidPropertiesFormatException, IOException{this.setProperties(filename);}/* get properties from .properties file* and set these values to Corresponding fields * */private void setProperties(String fileName) throws FileNotFoundException,IOException,InvalidPropertiesFormatException {this.prop = new Properties();InputStream fis =  this.getClass().getResourceAsStream(fileName);prop.load(fis);this.dbms = this.prop.getProperty("dbms");this.dbName = this.prop.getProperty("database_name");this.userName = this.prop.getProperty("user_name");this.password = this.prop.getProperty("password");this.serverName = this.prop.getProperty("server_name");this.portNumber = Integer.parseInt(this.prop.getProperty("port_number"));System.out.println("Set the following properties:");System.out.println("dbms: " + dbms);System.out.println("dbName: " + dbName);System.out.println("userName: " + userName);System.out.println("password: " + password);System.out.println("serverName: " + serverName);System.out.println("portNumber: " + portNumber);}/* step 1 to execute query using JDBC* get connection with connection properties* */public Connection getConnection() throws ClassNotFoundException, SQLException{Class.forName("oracle.jdbc.driver.OracleDriver");System.out.println("Oracle JDBC Driver Registered!");Connection conn = null;Properties connectionProps = new Properties();connectionProps.put("user", this.userName);connectionProps.put("password", this.password);if (this.dbms.equals("oracle")) {String dburl = "jdbc:"+this.dbms+":"+dbName+":@"+this.serverName+":"+this.portNumber+"/xe";System.out.println("dburl is:"+dburl);conn = DriverManager.getConnection(dburl, connectionProps);System.out.println("Connected to database successfully!");}return conn;}
}

package myjdbc;public class TestJdbc {public static void main(String[] args) {// TODO Auto-generated method stubtry{myjdbcutil db = new myjdbcutil("mydb.properties");db.getConnection();}catch(Exception e){e.printStackTrace();}}
}

Set the following properties:
dbms: oracle
dbName: thin
userName: test
password: test
serverName: localhost
portNumber: 1522
Oracle JDBC Driver Registered!
dburl is:jdbc:oracle:thin:@localhost:1522/xe
Connected to database successfully!