在 Spring4 中配置 CommonsMultipartResolver 失败

Question

我在 applicationContext.xml 中配置 CommonsMultipartResolver 如下：

<bean id="multipartResolver"
      class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
</bean>

但它抛出异常如下：

15-Feb-2017 22:17:35.049 INFO [RMI TCP Connection(2)-127.0.0.1] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
15-Feb-2017 22:17:35.107 INFO [RMI TCP Connection(2)-127.0.0.1] org.springframework.web.context.ContextLoader.initWebApplicationContext Root WebApplicationContext: initialization started
15-Feb-2017 22:17:35.172 INFO [RMI TCP Connection(2)-127.0.0.1] org.springframework.web.context.support.XmlWebApplicationContext.prepareRefresh Refreshing Root WebApplicationContext: startup date [Wed Feb 15 22:17:35 CST 2017]; root of context hierarchy
15-Feb-2017 22:17:35.240 INFO [RMI TCP Connection(2)-127.0.0.1] org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions Loading XML bean definitions from ServletContext resource [/WEB-INF/applicationContext.xml]
15-Feb-2017 22:17:35.563 WARNING [RMI TCP Connection(2)-127.0.0.1] org.springframework.web.context.support.XmlWebApplicationContext.refresh Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'multipartResolver' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.multipart.commons.CommonsMultipartResolver]: No default constructor found; nested exception is java.lang.NoClassDefFoundError: org/apache/commons/fileupload/FileItemFactory
15-Feb-2017 22:17:35.575 SEVERE [RMI TCP Connection(2)-127.0.0.1] org.springframework.web.context.ContextLoader.initWebApplicationContext Context initialization failed
 org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'multipartResolver' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.multipart.commons.CommonsMultipartResolver]: No default constructor found; nested exception is java.lang.NoClassDefFoundError: org/apache/commons/fileupload/FileItemFactory
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1155)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1099)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
    ...

我不知道为什么 CommonsMultipartResolver 无法实例化。 我可以在 spring-web-4.3.6.RELEASE.jar 中找到 CommonsMultipartResolver。 但是抛出这个异常：

java.lang.NoClassDefFoundError: org/apache/commons/fileupload/FileItemFactory

我的配置有什么问题？（我使用的是 Intellij IDEA）

更新
这是我的 applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="multipartResolver"
          class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    </bean>
</beans>

我试图通过将commons-fileupload添加到 IDEA 项目设置 --> 库来解决问题。 但它没有帮助，问题仍然存在。
IDEA的项目结构设置

IDEA的项目结构设置

Answer 1

下载commons-fileupload并将其保存在容器的模块文件夹中。 显然，类org.springframework.web.multipart.commons.CommonsMultipartResolver对org.apache.commons.fileupload.FileItemFactory有一个硬依赖，它是上面 jar 中包含的一个类。 一旦你的容器类加载器加载了这个类，你就不会得到这个错误。

Answer 2

如果您使用的是 maven，请尝试

    <dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.4</version> <!-- makesure you put a correct version here -->
    </dependency>