在jLabel上使用setIcon会重复旧图像 [英] Use of setIcon on jLabel repeats old image

问题描述

我正在尝试显示从网站下载的图片，使用 setIcon 和 jLabel

I'm attempting to display an image that was downloaded from a website, with the use of setIcon and a jLabel

jLabel5.setIcon(new ImageIcon("image.png"));

在程序开始时，图像不存在，下载，之后显示，没有问题。但是如果它改变了，即使它下载了一个较新版本的图像，它也会显示旧图像，好像它有一个缓存或其他东西。

At the start of the program, the image doesn't exist, it gets downloaded, and after that displayed, with no problems. But if it changes, even if it downloads a newer version of the image, it will display the old one, as if it had a cache of it or something.

有人知道为什么会这样吗？如何使用或不使用此方法获得解决方法？

Does someone know why this happens? How to get a workaround with or without this method?

我还尝试执行以下操作以查看它是否有帮助，但没有成功：

I have also tried to do the following to see if it could help, with no success:

jLabel5.setIcon(null);
jLabel5.setIcon(new ImageIcon("image.png"));

它会显示任何内容，然后再显示相同的旧图像。

It would display nothing and then the same old image again.

推荐答案

它将显示旧的，好像它有一个缓存或其他东西。

it will display the old one, as if it had a cache of it or something.

是的，缓存是个问题。以下是几个选项：

Yep, caching is the problem. Here are a couple of options:

//  This works using ImageIO

imageLabel.setIcon( new ImageIcon(ImageIO.read( new File(imageName) ) ) );

//  Or you can flush the image

ImageIcon icon = new ImageIcon(imageName);
icon.getImage().flush();
imageLabel.setIcon( icon );

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