code: public static BufferedImage rotate(String srcPath, String taPath, int degree)
              throws IOException {
          File srcIm = Files.findFile(srcPath);
          if (null == srcIm)
              throw Lang.makeThrow("Fail to find image file '%s'!", srcPath);
  
          File taIm = Files.createFileIfNoExists(taPath);
          return rotate(srcIm, taIm, degree);
      }
docs: 对一个图像进行旋转
  
  @param srcPath
  原图像文件路径
  @param taPath
  转换后的图像文件路径
  @param degree
  旋转角度, 90 为顺时针九十度， -90 为逆时针九十度
  @return 旋转后得图像对象