servlet上传文件500异常

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本文介绍了解决Spring MVC框架中文件上传时出现的MultipartException异常的方法。通过在web.xml中正确配置MultipartConfig元素，可以有效避免因缺少多部分请求配置而导致的问题。

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上传文件抛如下异常：

严重: Servlet.service() for servlet [dispatcherServlet] in context with path [/Construction] threw exception
org.springframework.web.multipart.MultipartException: Could not parse multipart servlet request; nested exception is java.lang.IllegalStateException:Unable to process parts as no multi-part configuration has been provided
	at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.parseRequest(StandardMultipartHttpServletRequest.java:99)
	at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.<init>(StandardMultipartHttpServletRequest.java:77)
	at org.springframework.web.multipart.support.StandardServletMultipartResolver.resolveMultipart(StandardServletMultipartResolver.java:76)
	at org.springframework.web.multipart.support.MultipartFilter.doFilterInternal(MultipartFilter.java:110)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
................

解决办法：

在web项目中的web.xml文件中配置MultipartConfig

在<servlet>中配置如下代码：
	<multipart-config>
		<max-file-size>52428800</max-file-size>
		<max-request-size>52428800</max-request-size>
		<file-size-threshold>0</file-size-threshold>
	</multipart-config>

比如，若是springMVC：
	<servlet>
		<servlet-name>dispatcherServlet</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value></param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
		<multipart-config>
			<max-file-size>52428800</max-file-size>
			<max-request-size>52428800</max-request-size>
			<file-size-threshold>0</file-size-threshold>
		</multipart-config>
	</servlet>