Spring文件上传异常

       前言

        使用SpringMVC框架进行文件上传操作时发生的问题。记录

一、问题一

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalArgumentException: Expected MultipartHttpServletRequest: is a MultipartResolver configured? org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:965)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:855)
javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:829)
javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
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:106)

请求处理失败;嵌套异常是java.lang。IllegalArgumentException:预期的MultipartHttpServletRequest:是否配置了一个多部件解析器?

需要在Spring配置文件中添加一个视图解析器。文件上传的视图解析器。

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <property name="defaultEncoding" value="UTF-8"/>
    <property name="maxUploadSize" value="5000000" />
</bean>

**文件上传的条件：form表单上需要是post请求、格式为enctype=”multipart/form-data”、控制器方法接收文件的类型为MultipartFile