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

运行一个注册显示验证码图片的小程序，之前在myeclipse上运行正常，但是今天移动到idea上就报错了，生成的图片显示不出来 javax.imageio.IIOException: Can't create output stream! javax.imageio.ImageIO.write(ImageIO.java:1574) cn.edu.sicau.utils.VerifyCode.

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