解决tomcat报错javax.imageio.IIOException: Can't create output stream!

启动tomcat catalina.out报错以下,登录的时候没法显示验证码java 2017-06-09 11:23:06,628 DEBUG org.springframework.web.servlet.DispatcherServlet 845 - DispatcherServlet with name 'spring-mvc' processing GET request for [/d
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