尝试 Image4J 。

这个快速的Scala REPL会话显示（可以粘贴为Java代码）：

As this quick Scala REPL session shows (paste-able as Java code):

> net.sf.image4j.codec.ico.ICODecoder.read(new java.net.URL("http://www.google.com/favicon.ico").openStream())

res1: java.util.List[java.awt.image.BufferedImage] = [BufferedImage@65712a80: type = 2 DirectColorModel: rmask=ff0000 gmask=ff00 bmask=ff amask=ff000000 IntegerInterleavedRaster: width = 16 height = 16 #Bands = 4 xOff = 0 yOff = 0 dataOffset[0] 0]

更新

回答您的问题：Java是否支持ICO？看起来不像：

To answer your questions: Does Java support ICO? Doesn't seem like it:

> javax.imageio.ImageIO.read(new java.net.URL("http://www.google.com/favicon.ico"))

java.lang.IllegalArgumentException: Empty region!

为什么 ImageIO 无法从网址是什么？好吧，URL本身似乎对我有用，所以你可能有代理/防火墙问题，或者它可能是上面的问题。

Why does ImageIO fail to read from the URL? Well, the URL itself seems to work for me, so you may have a proxy/firewall issue, or it could be the problem above.