ImageIO的Java未知源 [英] Java unknown source with ImageIO

问题描述

我的程序在Netbeans中运行良好，但是在浏览器中运行小程序时出现以下错误:

My program runs fine in Netbeans, but I get the following error when I run my applet in a browser:

java.lang.IllegalArgumentException: input == null!
    at javax.imageio.ImageIO.read(Unknown Source)

我打开罐子，以验证png文件是否正确放置在其中.我不确定以下原因为何不起作用(当然，在try块中):

I opened the jar to verify that the png files are correctly placed there. I'm not certain why the following doesn't work (in a try block, of course):

BufferedImage beam = ImageIO.read(this.getClass().getResource("images/beam.png"));

我尝试了以下类似的其他操作，但怀疑问题可能是其他原因.

I've tried other things like the following, but suspect the problem might be something else.

URL url = this.getClass().getResource("images/beam.png");
BufferedImage beam = ImageIO.read(url.openStream());

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推荐答案

问题出在您的字符串路径中.改用它:

The problem is in your path String. Use this instead:

BufferedImage beam = ImageIO.read(this.getClass().getResource("/images/beam.png"));

(请注意路径前的/)

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