屬性檔名稱UPay.properties,取鍵位UPay.AGENCY_RECHARGE_RET_URL的值：

package com.onlinecredit.util;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public final class Property {

	private static Properties prop;
	
	static{
		prop = new Properties();
        InputStream in = Object.class.getResourceAsStream("/UPay.properties");
        try {
            prop.load(in);
        } catch (IOException e) {
            e.printStackTrace();
        } 
	}
	
	public static String getProperty(String key){
		return prop.getProperty(key);
	}
	
	public static void main(String[] args) {
		System.out.println(Property.getProperty("UPay.AGENCY_RECHARGE_RET_URL"));
	}
}