​​​​​​​javax.imageio.IIOException: Can't create output stream!

運行一個註冊顯示驗證碼圖片的小程序，之前在myeclipse上運行正常，但是今天移動到idea上就報錯了，生成的圖片顯示不出來 javax.imageio.IIOException: Can't create output stream! javax.imageio.ImageIO.write(ImageIO.java:1574) cn.edu.sicau.utils.VerifyCode.

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