如何更改Servlet 3.0 Spring MVC分段上传表单的字符编码？

Question

我有一个非常简单的JSP/Servlet 3.0/Spring MVC 3.1应用程序.

在我的一个页面上,我有多种形式.其中一种形式允许用户上传文件,因此配置文件enctype="multipart/form-data".我在web.xml文件multipart-config中使用自Servlet 3.0以来可用的元素配置了multipart上传,并结合了<bean id="multipartResolver" class="org.springframework.web.multipart.support.StandardServletMultipartResolver"/>我的spring配置.

我也org.springframework.web.filter.CharacterEncodingFilter配置了Spring .

我遇到的问题是我找不到将StandardServletMultipartResolver的默认编码设置为UTF-8的方法,这通常会导致多部分表单中文本字段的内容全部出现乱码.

有没有什么办法解决这一问题？

提前致谢.

web.xml配置:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                  http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
<display-name>foo-web</display-name>
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>
        WEB-INF\applicationContext.xml
    </param-value>
</context-param>
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<servlet>
    <servlet-name>foo</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>0</load-on-startup>
    <multipart-config>
        <max-file-size>52428800</max-file-size>
        <file-size-threshold>5242880</file-size-threshold>
    </multipart-config>
</servlet>
<servlet-mapping>
    <servlet-name>foo</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

<filter>
    <filter-name>CharacterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>CharacterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

<filter>
    <filter-name>springSecurityFilterChain</filter-name>
    <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
    <filter-name>springSecurityFilterChain</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
    <welcome-file>login</welcome-file>
</welcome-file-list>

Answer 1

由于我发现没有办法使用它设置默认编码StandardMultipartResolver,我转储了servlet 3.0配置,并为了好老CommonsMultipartResolver.

我在我的spring servlet上下文中这样配置它:

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <!-- one of the properties available; the maximum file size in bytes -->
    <property name="maxUploadSize" value="157286400" />
    <property name="maxInMemorySize" value="5242880"/>
    <property name="defaultEncoding" value="utf-8"/>
</bean>

最后,没有太大的区别,因为在它的引擎盖下StandardMultipartResolver,它只是代表CommonsMultipartResolver.

我实际上发现servlet 3.0方法更麻烦,因为它需要在web.xml和servlet上下文中进行配置,并且你失去了设置默认编码的能力.