SpringMVC实现文件上传操作过程中遇到的坑：由于没有提供multi-part配置，无法处理parts

项目场景：

SpringMVC实现文件上传操作过程中遇到的坑

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问题描述

使用SpringMVC实现文件上传功能，点击上传文件后浏览器报错如下：

类型 异常报告

消息 Request processing failed; nested exception is org.springframework.web.multipart.MultipartException: Failed to parse multipart servlet request; nested exception is java.lang.IllegalStateException: 由于没有提供multi-part配置，无法处理parts

描述 服务器遇到一个意外的情况，阻止它完成请求。

例外情况

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.web.multipart.MultipartException: Failed to parse multipart servlet request; nested exception is java.lang.IllegalStateException: 由于没有提供multi-part配置，无法处理parts
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
	org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:515)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:583)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)

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原因分析：

提示：这里解决问题主要参考报错部分中的“由于没有提供multi-part配置，无法处理parts”，

处理文件上传时，id是固定的值，不可变

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解决方案：

提示：修改springmvc.xml中文件上传解析器的id属性，将bean的id改为multipartResolver

我原来的xml配置，id="commonsMultipartResolver"

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

    <!--
    开启mvc的注解驱动
    配置HandlerMapping和HandlerAdapter-->
    <mvc:annotation-driven/>

    <!--扫描spring实例化注解
    base-package="com.xiaoma": 扫描根包
    -->
    <context:component-scan base-package="com.xiaoma"/>

    <!--配置视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!--配置前缀-->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!--配置后缀-->
        <property name="suffix" value=".jsp"/>
    </bean>


    <!--Tomcat中默认处理静态资源的servlet-->
    <mvc:default-servlet-handler/>

    <!--文件上传的解析器
    maxUploadSize:最大上传大小,字节，10MB = 10*1024KB = 10*1024*1024B = 10485760
    -->
    <bean class="org.springframework.web.multipart.commons.CommonsMultipartResolver" id="commonsMultipartResolver">
        <property name="maxUploadSize" value="10485760"/>
    </bean>

</beans>

修改后

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

    <!--
    开启mvc的注解驱动
    配置HandlerMapping和HandlerAdapter-->
    <mvc:annotation-driven/>

    <!--扫描spring实例化注解
    base-package="com.xiaoma": 扫描根包
    -->
    <context:component-scan base-package="com.xiaoma"/>

    <!--配置视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!--配置前缀-->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!--配置后缀-->
        <property name="suffix" value=".jsp"/>
    </bean>


    <!--Tomcat中默认处理静态资源的servlet-->
    <mvc:default-servlet-handler/>

    <!--文件上传的解析器
    maxUploadSize:最大上传大小,字节，10MB = 10*1024KB = 10*1024*1024B = 10485760
    -->
    <bean class="org.springframework.web.multipart.commons.CommonsMultipartResolver" id="multipartResolver">
        <property name="maxUploadSize" value="10485760"/>
    </bean>

</beans>

至此，问题成功得到解决！

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