使用 ImageIO.read 的问题 [英] Problem using ImageIO.read

问题描述

好的，我有一张我正在尝试阅读的图片.问题是 Image.read(file) 返回 NULL.

Ok I have an Image that I'm trying to read. Problem is that the Image.read(file) returns NULL.

File file = new File("C:\\images\\image1.jpg");
if(file.exists()){
    System.out.println("Image file exists.");
    BufferedImage originalImage = ImageIO.read(file);

}

所以图像存在但 ImageIO.read(file) 返回 NULL.没有抛出错误什么都没有！！！怎么回事?

So image exists but ImageIO.read(file) returns NULL. No thrown errors nothing!!! Whats going on?

这是我迄今为止尝试过的:

This is what I have tried so far:

1. 好的，我的环境是 Windows 7.我使用其中一张图像进行测试带有 Windows 并且它能够阅读图像.
2. image1.jpg 是由另一个系统.现在确定什么方法他们正在使用.
3. 我尝试将图像转换为此处建议的 RGB 链接文本但它因不是 JPEG 文件:以 0x4d 0x4d 开头"而失败.
4. 图片扩展名为 .jpg，但windows 说它是 JPEG 类型?这个令人困惑.

1. Ok my environment is Windows 7. I tested with one of those images that comes with Windows and its able to read the image.
2. The image1.jpg was created by another system. Now sure what method they are using.
3. I tried converting the image into RGB as suggested here link text but it fails with "Not a JPEG file: starts with 0x4d 0x4d".
4. The image extension is .jpg, but windows says its a JPEG type? This is confusing.

有人可以帮忙吗?我是新手，不知道如何解决这个问题.

Can someone help with this? I'm new to this, not sure how to fix this.

好的，我刚刚发现 ImageIO.getImageReaders(stream) 返回一个空的迭代器.这意味着它找不到合适的阅读器?我应该如何阅读这张图片?

Ok I just figured out that ImageIO.getImageReaders(stream) returns an empty Iterator. This means that it couldn't find a suitable reader? How am I supposed to read this image?

推荐答案

好吧，因为我换了笔记本电脑，我看了看我的旧笔记本电脑，在 jre/ext/lib 中找到了这个 JAR jai-imageio.jar(我知道这不是个好主意).我把它移到了我的项目/库中，它起作用了！我猜这个 jai-imageio.jar 包含额外的图像阅读器.

Ok since I switched laptops, I looked at my old laptop and found this JAR jai-imageio.jar in the jre/ext/lib (I know bad idea). I moved it to my project/lib and it worked! I guess this jai-imageio.jar contains additional image readers.

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