读取验证码时报错 Caused by: javax.imageio.IIOException: Can't create cache file!
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错误定位如下：
ImageIO.write(image, “JPEG”, bays);
Caused by: javax.imageio.IIOException: Can't create cache file! at javax.imageio.ImageIO.createImageOutputStream(ImageIO.java:397) at javax.imageio.ImageIO.write(ImageIO.java:1558) ... 119 more Caused by: java.io.IOException: 系统找不到指定的路径。 网上有人说是TOMCAT目录,在TOMCAT根目录(与bin目录同级)创建temp目录,再刷新页面,就可以，但是我是的tomcat目录下是有temp目录的，后来发现是tomcat文件夹只有读权限没有写的权限。
最后的解决办法是将tomcat文件夹属性的读写权限开放即可
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