获取文件大小 单位M

/**
	 * 获取文件大小 单位M
	 * @param file
	 * @return
	 * @throws UtilException
	 */
	public static double getFileSize(File file) throws UtilException{
		try {
		   double size=0;
		         if (file.exists()) {
		             FileInputStream fis = null;
					 fis = new FileInputStream(file);
		             size= fis.available();
		         } else {
		        	 return 0;
		         }
		         size = size/1024.00/1024.00;
		         size=Double.parseDouble(size+"");
		         BigDecimal b = new BigDecimal(size); 
		         double y1 = b.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue(); 
		         java.text.DecimalFormat df =new java.text.DecimalFormat("#.00"); 
		         return Double.parseDouble(df.format(y1));
		   }catch (FileNotFoundException e) {
			   throw new UtilException(e);
		   } catch (IOException e) {
			   throw new UtilException(e);
		}
	}