Properties文件操作

File f  =   new  File( " c:\\my.properties " );
        Properties prop  =   new  Properties();
         if  (f.exists()) {
             try  {
                InputStream in  =   new  FileInputStream(f);
                prop.load(in);
                in.close();
                System.out.println(prop.get( " requestTime " )); // 读properties文件
                OutputStream out  =   new  FileOutputStream(f);
                prop.setProperty( " derek " , " dada " ); // 设置属性
                prop.store(out, " THE LOCKED TIME SET " ); // 写properties文件                
            }  catch  (FileNotFoundException ex) {ex.printStackTrace();
            }  catch  (IOException ex) {ex.printStackTrace();}
        } else  System.out.println( " 文件不存在 " );