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完整錯誤：

org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.web.multipart.MultipartFile]: Specified class is an interface
??? org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:101)
??? org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolveModelAttribute(HandlerMethodInvoker.java:762)
??? org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolveHandlerArguments(HandlerMethodInvoker.java:356)
??? org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:171)
??? org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426)
??? org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)
??? org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
??? org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
??? org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
??? org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
??? javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
??? javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
??? org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
??? org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
??? org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
??? org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
??? org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)

?

之前也遇到過，給忘記了，結果又犯錯誤了

這個錯誤原因是前臺form表單提交時候需要添加一個屬性給form表單

?

enctype="multipart/form-data"

在form表單中添加這個

?

<form action="uploadchatinfo" method="post" enctype="multipart/form-data">

轉載于:https://my.oschina.net/u/2539182/blog/753294

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