如何将Icon从JLabel转换为BufferedImage？ [英] How to convert Icon from JLabel into BufferedImage?

问题描述

简单，非常直接但似乎叔叔谷歌和我感到困惑。

Simple, very straight forward but seems uncle google and me getting confused.

我有单个 JLabel 那个已经拥有自己的图标。

I have single JLabel that already has its own Icon.

如何转换图标从 JLabel 获得 BufferedImage ？

有没有办法：我尝试了多次投射这样..

Is there any way around: I tried to multiple casting like this ..

 final BufferedImage bf1 = (BufferedImage)((Image)jll_img.getIcon());

..但失败了。

推荐答案

放大@Andrew Thompson的回答，请注意实现 图标 界面知道如何绘制某些东西，但可能还没有要求它这样做。相比之下， BufferedImage 程序必须通过调用 paintIcon（）方法呈现的图像数据的可访问缓冲区。这是一个相关的示例。

To amplify on @Andrew Thompson's answer, note that an object that implements the Icon interface knows how to paint something, but it may not have been asked to do so yet. In contrast, a BufferedImage has "an accessible buffer of image data" that your program must render by calling the paintIcon() method. Here's a related example.

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