ImageIO无法读取输入文件（科特琳）

Question

Hi i using kotlin to make a discord bot, I have a PNG called sam.png but i try to insert and get this error:

[23:18:38] [Fatal] [JDA]: javax.imageio.IIOException: Can't read input file!

override fun run(ev: MessageReceivedEvent) {
    var selaSam: Image = ImageIO.read(File("/sam.png"))
    var image = LikeUtils.downloadImage(LikeUtils.getUserHandle(ev).getEffectiveAvatarUrl())

    image.graphics.drawImage(selaSam, 200, 200, null)

    LikeUtils.sendFile(image, "/resources/sam.png", null)
}

Answer 1

The path /sam.png means that the file is available in the root path (not the workiing path of your project but the root path of your system). I doubt that this is the case.

I guess you want that path: ./sam.png . Would be better to check if the file exists with

override fun run(ev: MessageReceivedEvent) {
    val imagePath = "/sam.png"
    val image = File(imagePath)
    if (!image.exists()) throw RuntimeException("Image $imagePath not found")
    if (image.isDirectory) throw RuntimeException("Image $imagePath is a directory")

    var selaSam: Image = ImageIO.read(image)
    var image = LikeUtils.downloadImage(LikeUtils.getUserHandle(ev).getEffectiveAvatarUrl())

    image.graphics.drawImage(selaSam, 200, 200, null)

    LikeUtils.sendFile(image, "/resources/sam.png", null)
}