BufferedImage到InputStream - 格式不同 - 编程

I am trying to convert my BufferedImage to an Inputstream using the following:

我正在尝试使用以下内容将我的BufferedImage转换为Inputstream:

BufferedImage bi = ImageIO.read(file.getInputStream());
bi = Scalr.resize(bi, 300);
ByteArrayOutputStream os = new ByteArrayOutputStream();
ImageIO.write(bi, file.getContentType(), os); //the content type is specified as image/jpeg

The problem I am facing is that my file.getContentType() returns the value as "image/jpeg" instead of e.g. "jpg", and thus shows a corrupt file.

我面临的问题是我的file.getContentType()将值返回为“image / jpeg”而不是例如“jpg”,因此显示了一个损坏的文件。

Is there a good way to convert this to jpg (or make it possibly accept image/jpeg)? I have many other file formats (png for instance) and think that a switch statement which does some logic to check what the content type is would be quite unnecessary.

有没有一个很好的方法将其转换为jpg(或使其可能接受image / jpeg)?我有许多其他文件格式(例如png),并认为执行某些逻辑来检查内容类型的switch语句是非常不必要的。

1 个解决方案

#1

.jpeg and .jpg are equivalent extensions - jpg exists due to the historic requirements of Windows to have an 8.3 filename.extension format.

.jpeg和.jpg是等效的扩展 - 由于Windows的历史要求具有8.3 filename.extension格式,因此存在jpg。

To get the necessary extension, pull it out of the content type:

要获得必要的扩展,请将其从内容类型中删除:

final String contentType = file.getContentType();
contentType.substring(contentType.lastIndexOf("/") + 1)

BufferedImage到InputStream - 格式不同

1 个解决方案

#1

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