将上传的图像从各种格式转换为 JPEG

发布于 2024-10-16 00:28:22 字数 993 浏览 3 评论 0原文

我正在开发一个允许用户上传图像的网站。我希望能够接受 BMP、GIF、JPEG 和 PNG（也许还有其他一两个，如 TIFF）格式。我正在使用 Apache Commons FileUpload 库来实现此目的。为了使所有图像最终采用相同的格式，我想将所有图像格式转换为 JPEG 格式。

对于上述所有图像格式都适用的最简单的方法是什么？

我尝试过：

ImageIO.read()，它为某些 GIF 文件提供了 javax.imageio.IIOException: Unexpected block type 0! 和 java.awt.color.CMMException: Invalid image format< /code> 用于 JPEG 文件。
JAI，它为 GIF 文件提供了巨大的错误跟踪。

编辑：有关 JAI 方法的信息：

堆栈跟踪：

错误：一个工厂执行“gif”操作失败
发生在：javax.media.jai.ThreadSafeOperationRegistry

，后跟数百行跟踪。

代码：

public static void convertToJPG(String originalFile, String newFile) throws Exception {
    RenderedImage image = JAI.create("fileload", originalFile);
    JAI.create("filestore", image, newFile, "JPEG");
}

图片：

无效的图片。

原文

I am developing a website that allows the user to upload images. I would like to be able to accept BMP, GIF, JPEG and PNG (and maybe one or two others like TIFF) formats. I am using the Apache Commons FileUpload library to achieve this. In order that all the images end up in the same format, I would like to convert all image formats to JPEG format.

What is the easiest way to do this which will work will all of the above image formats?

I have tried:

ImageIO.read(), which gave javax.imageio.IIOException: Unexpected block type 0! for some GIF files and java.awt.color.CMMException: Invalid image format for JPEG files.
JAI, which gave a humongous error trace for GIF files.

Edit: Information about the JAI method:

Stack trace:

Error: One factory fails for the operation "gif"
Occurs in: javax.media.jai.ThreadSafeOperationRegistry

followed by literally hundreds of lines of trace.

Code:

public static void convertToJPG(String originalFile, String newFile) throws Exception {
    RenderedImage image = JAI.create("fileload", originalFile);
    JAI.create("filestore", image, newFile, "JPEG");
}

Image:

An image which doesn't work.

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