Upload file by using SpringMVC CommonsMultipartResolver

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Error Information:
HTTP Status 400 – Bad Request
The server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing).

Error Cause:
dispatcherServlet-servlet.xml

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<!-- for uploading files -->
<!-- the id should be unique -->
<!-- error occurs -->
	<bean id="commonsMultipartResolver"
		class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<property name="defaultEncoding" value="UTF-8"></property>
	</bean>

Why? Review class DispatcherServlet:

public static final String MULTIPART_RESOLVER_BEAN_NAME = "multipartResolver";
Pay more attention to other final variables.

Error Solution:

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