如何使用java在google appengine中读取图像url [英] How to read a image url in google appengine using java

问题描述

ImageIO 不在 GAE 的白名单中.如何在不使用 ImageIO 的情况下从 url 读取图像(JPG、PNG)作为 ImageBuffer?

The ImageIO is not in the whitelist of GAE. How to read a image(JPG,PNG) from url as ImageBuffer without using ImageIO?

推荐答案

您可以读取 url 流并使用 IOUtils 来自 apache commons.

You could read the url stream and create a bytearray using the IOUtils from apache commons.

URL url = new URL(this.url);
InputStream input = url.openStream();
byteArray = IOUtils.toByteArray(input)

^{注意:
toByteArray 方法在内部缓冲输入，因此不需要使用 BufferedInputStream.}

^{Note:
toByteArray method buffers the input internally, so there is no need to use a BufferedInputStream.}

BufferedImage 被列为 AppEngine 不支持；这意味着您不能在 Google App Engine 上使用该第三方库.

BufferedImage is listed as not supported on AppEngine; that means that you CAN'T use that third party library on Google App Engine.

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