java如何读取.properties文件的数据

package cn.com.cis.acic.util;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

/**
 * 定义一个工具类,负责连接数据库及其关闭数据资源
 */
public class DBUtil {
 
 private static final String LOCATION="dbOracle.properties";
 private static Properties props=new Properties();
 static{

 ClassLoader loader=DBUtil.class.getClassLoader();
 InputStream is=loader.getResourceAsStream(LOCATION);
 try {
  props.load(is);
 } catch (IOException e) {
  System.out.println("填充Properties对象失败!");
  e.printStackTrace();
 }
 }
 
 private DBUtil(){}
 
 public static Connection getConnection(){
 
  String driver=props.getProperty("driver");
 String url=props.getProperty("url");
 String username=props.getProperty("username");
 String password=props.getProperty("password");

 try {
  Class.forName(driver);
 } catch (ClassNotFoundException e) {
  System.out.println("数据库驱动类加载失败!");
  e.printStackTrace();
 }
 
 Connection conn=null;
 try {
  conn=DriverManager.getConnection(url, username, password);
 } catch (SQLException e) {
  System.out.println("连接数据库失败!");
  e.printStackTrace();
 }
 return conn;
 }
 
 public static void close(ResultSet rs,Statement stmt, Connection conn){

 if(rs!=null){
  try {
  rs.close();
  } catch (SQLException e) {
  System.out.println("关闭结果集对象失败!");
  e.printStackTrace();
  }
 }
 if(stmt!=null){
  try {
  stmt.close();
  } catch (SQLException e) {
  System.out.println("关闭语句对象失败!");
  e.printStackTrace();
  }
 }
 if(conn!=null){
  try {
  conn.close();
  } catch (SQLException e) {
  System.out.println("关闭连接对象失败!");
  e.printStackTrace();
  }
 }
 }

 public static void close(ResultSet rs, Statement stmt){
 close(rs,stmt,null);
 }
 public static void close(Statement stmt, Connection conn){
 close(null,stmt,conn);
 }
 public static void close(Connection conn){
 close(null,null,conn);
 }
}

也可以直接读取，如：

  //读取数据库链接：
  InputStream in = FeeManageServiceSpringImpl.class.getResourceAsStream("/accountjdbc.properties");//文件名称
  InputStream in = new BufferedInputStream(new
  FileInputStream("D:\tomcat-7\webapps\sales\WEB-INF\classes\accountjdbc.proerties"));//详细地址
  Properties p = new Properties();
  p.load(in);
  String className2 = p.getProperty("DRIVER");
  String url = p.getProperty("URL");
  String user = p.getProperty("USER");
  String password = p.getProperty("PASSWORD");
  Class.forName(className2);