java 读取,修改properties文件，不改变文件内容顺序

   FileInputStream input1 = new FileInputStream("/jdbc.properties");//读取代码
        SafeProperties safeProp1 = new SafeProperties();
        safeProp1.load(input1);
        String safe= safeProp1.getProperty("url"); 

       
         input1.close();   FileInputStream input1 = new FileInputStream