Properties操作如何保存到属性文件

import java.util.*;
import java.io.*;
public class ReadPro
{   static Properties props;
	private String oracle_url,oracle_name,oracle_user,oracle_pwd;
	private String file_path,virtual_path;
	static
	{
		try
		{
			props = new Properties();
			File f=new File(".\\OracleSetup.properties");
			FileInputStream in = new FileInputStream(f);
			props.load(in);
			in.close();
		}
		catch(IOException e)
		{
			System.out.println(e);
		}
	}
	public ReadPro()
	{
			this.oracle_url   = this.props.getProperty("oracle_url");
			this.oracle_name  = this.props.getProperty("oracle_name");
			this.oracle_user  = this.props.getProperty("oracle_user");
			this.oracle_pwd   = this.props.getProperty("oracle_pwd");
			this.file_path    = this.props.getProperty("file_path");
			this.virtual_path = this.props.getProperty("virtual_path");
		}
	public void loadproper()
	{    props.setProperty("oracle_user", "bush");
		 props.setProperty("password", "1234");
		 props.setProperty("age", "19");
         props.setProperty("sex", "female");
         props.setProperty("score", "99.9");
			try{
			FileOutputStream out = new 
			     FileOutputStream(".\\Bush.properties");
		    props.store(out, ".\\Bush.properties");
			out.close();
		   }
		  catch(IOException e)
		{
			System.out.println(e);
		}
	 }
	public String getOracle_url()
	{
		return oracle_url;
	}
	public String getOracle_name()
	{
		return oracle_name;
	}
	public String getOracle_user()
	{
		return oracle_user;
	}
	public String getOracle_pwd()
	{
		return oracle_pwd;
	}
	public String getFile_path()
	{
		return file_path;
	} 
	public String getVirtual_path()
	{
		return virtual_path;
	}
	public static void main(String args[])
	{
		ReadPro rp = new ReadPro();
		System.out.println("oracle_user="+rp.getOracle_user());
	    System.out.println("oracle_name = " + rp.getOracle_name());
		System.out.println("oracle_pwd = " +rp.getOracle_pwd());
		System.out.println("file_path = " +rp.getFile_path());
	    System.err.println("file_path = " +rp.getFile_path()); 
	    System.out.println("virtual_path = " +rp.getVirtual_path());
		//存储Properties 到属性文件
	    rp.loadproper();
	}	
}

//new一个properties对象
			Properties props = new Properties();
			//新建一个输入流（属性文件），读取到properties对象里
			File f=new File(".\\OracleSetup.properties"); //这个属性文件需要先创建（已经存在的）
			FileInputStream in = new FileInputStream(f);
			//读入对象
			props.load(in);
			//关闭流
			in.close();

 		
		//对属性对象进行set操作。以键值对的方式set，前面是字段key，后面是值value
		props.setProperty("oracle_user", "bush");
		 props.setProperty("password", "1234");
		 props.setProperty("age", "19");
         props.setProperty("sex", "female");
         props.setProperty("score", "99.9");
			try{
			FileOutputStream out = new 
			     FileOutputStream(".\\Bush.properties");//这个属性文件可以是不存在的，不存在系统会去自动创建，如果已存在系统会先删除再创建
              //将对象再保存到文件里
		    props.store(out, ".\\Bush.properties");
              //关闭输出流
			out.close();
		   }
		  catch(IOException e)
		{
			System.out.println(e);
		}