ImageIcon不会为具有相同URL的新图像更新 [英] ImageIcon do not update for a new image with the same URL

问题描述

我想使用JLabel(Icon)显示来自我网站的图像( http://xxx.xxx.xxx.xxx/java_pic/test.jpg ).我有一个刷新按钮来新建一个新的JLabel和ImageIcon(以获取最新的图像)该程序成功运行...但是当我上传新图像以覆盖旧图像时( http://xxx.xxx.xxx.xxx/java_pic/test.jpg )，我按下了刷新按钮……什么也没发生！我重新启动程序...现在出现新图像...为什么?当我再次新建ImageIcon时，它不应该从网站上重新加载图像吗?

I would like to use JLabel(Icon) to show a Image which is from my website(http://xxx.xxx.xxx.xxx/java_pic/test.jpg). And I have a refresh button to new a new JLabel and ImageIcon(in order to get the newest image) The program run successfully...but when I upload a new image to override the old one(http://xxx.xxx.xxx.xxx/java_pic/test.jpg), I press the refresh button... nothing happened! I restart my program... and the new image now appears... why? Shouldn't it reload the image from website when I new a ImageIcon again?

public void refresh(){
    URL iconUri = null;
    iconUri = new URL("http://XXX.XXX.XXX.XXX/java_pic/test.jpg");
    ImageIcon imageIcon = new ImageIcon(iconUri);
    JLabel imageLabel = new JLabel(imageIcon);
    frame.add(imageLabel);
    ...
    ...
}

当我单击刷新按钮时，它将调用refresh()...为什么?谢谢！

when I click the refresh button, it would call the refresh()...why? Thanks!

推荐答案

图像已缓存.刷新以清除缓存:

The image is cached. Flush to clear the cache:

imageIcon.getImage().flush();

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