springmvc上传文件报错org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.web.multipart.MultipartFile]

时间：2021-10-13 04:18:55

在用springmvc+mybatis进行项目开发时，上传文件抛异常...

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)

解决方法：在Controller的MultipartFile参数前面加上@RequestParam就行了！

如：

@RequestMapping("/save")

    public String save(User user,

            HttpServletResponse response,

            @RequestParam MultipartFile file_pic//接收图片

            )throws Exception{

        //原始名称

        String originalFilename = file_pic.getOriginalFilename();

        //上传图片

        if(file_pic!=null && originalFilename!=null && originalFilename.length()>0){

            //存储图片的物理路径

            String pic_path = "G:\\nfsysuems\\temp\\";

            //新的图片名称

            String newFileName = UUID.randomUUID() + originalFilename.substring(originalFilename.lastIndexOf("."));

            //新图片

            File newFile = new File(pic_path+newFileName);

            //将内存中的数据写入磁盘

            file_pic.transferTo(newFile);

            //新图片写入user

            user.setPic(newFileName);

        }

      .......

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