IllegalArgumentException 输入 == null [英] IllegalArgumentException Input == null

问题描述

我正在尝试将图像读取为 InputStream.但出于某种原因，我总是收到 IllegalArugmentException.

I am trying to read an Image as an InputStream. But for some reason I always get an IllegalArugmentException.

这是我的代码:

BufferedImage i = null; 
i = ImageIO.read(getClass().getResourceAsStream("/res/graphics" + path));

推荐答案

原因:

您的资源评估为 null，这就是异常

Your resource evaluates to null and that is why the exception

API 文档

抛出:IllegalArgumentException - 如果输入为 null.

Throws: IllegalArgumentException - if input is null.

解决方案:

如果 res/graphics/whatever 在根的类路径中，那么它将返回非空

If res/graphics/whatever is in classpath at root then it will return not null

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