Java项目中的Oracle用户认证怎么利用JDBC实现

import java.sql.Connection;import java.sql.DriverManager;import java.sql.SQLException;import org.slf4j.Logger;import org.slf4j.LoggerFactory;public class Oracle {  private static final Logger logger = LoggerFactory.getLogger(Oracle.class);  public static Connection getConnection() {    Connection conn = null;    try {      Class.forName("oracle.jdbc.driver.OracleDriver");      logger.debug("尝试连接数据库");      String url = "jdbc:oracle:thin:@192.168.0.20:1541:test";      String username = "apps";      String password = "apps";      conn = DriverManager.getConnection(url, username, password);    } catch (ClassNotFoundException cnfe) {      logger.error(cnfe.getMessage());    } catch (SQLException sqle) {      logger.error(sqle.getMessage());    }    return conn;  }  public static void closeConnection(Connection conn) {    try {      if (conn != null) {        conn.close();        conn = null;      }    } catch (SQLException sqle) {      logger.error(sqle.getMessage());    }  }}