Java 支持使用 ImageIO.read() 读取整个图像，但是有没有办法只读取部分图像？
背景：
我正在开发一个地图应用程序，读取大图像，将其分割，然后使用生成的图块作为地图的背景。在某些情况下，提供的图像可能太大，以至于将图像作为 BufferedImage 读取可能已经导致 OutOfMemoryError。
我知道我可以授予虚拟机更多的堆空间，但我仍然更喜欢一种通过仅部分读取图像（即 256*256 像素的图块）来进一步降低风险的方法，我可以将其直接保存到文件系统。
Java supports reading of whole images with ImageIO.read(), but is there a way of reading an image only partially?
Background:
I'm working on a map application that reads large images, splits them up, then uses the generated tiles as the background of a map. In some cases the provided image can be so large that reading the Image as a BufferedImage might already cause an OutOfMemoryError.
I'm aware I could grant the VM more heap space, still I'd prefer a way to further reduce the risk by reading the image only in parts, i. e. in tiles of 256*256 pixels, that I could save straight away to the file system.
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我已经很长时间没有使用它了，但是您可以使用 TiledImage 通过 JAI（Java 高级成像）来实现它。
JAI 主页。
It's a long time since I've used it but you can do it with JAI (Java Advanced Imaging) using a TiledImage.
JAI homepage.
如果您使用 PNG 格式，此库可让您逐行加载图像，因此无需将其完全加载到内存中 http://code.google.com/p/pngj/
In case you are using PNG format, this library lets you load an image line by line, so you don't need to load it fully in memory http://code.google.com/p/pngj/