Spring Security，Spring Webflow，文件上传和UTF-8问题

我遇到的问题与此处描述的问题非常相似:

I have a problem very similar to the one described here: File Upload using Spring WebFlow 2.4.0, parameter not binded, but that one didn't mention anything about UTF-8 issues. I'm using Spring Framework 4.1.6, Spring Security 4.0.2 and Spring Webflow 2.4.2.

据我所知，它围绕StandardServletMultipartResolver与CommonsMultipartResolver旋转，但是我不确定.如果使用CommonsMultipartResolver，则可以在任何页面上上传文件，但Webflow页面除外，并且UTF-8编码在所有页面上都可以正常工作.但是，在Webflow页面上，尝试访问该文件会引发异常.如果我使用StandardServletMultipartResolver，则所有文件上传工作(包括Webflow)都可以正常工作，但是在任何具有UTF-8字符(例如caractère)的页面上，我都会得到垃圾.

It revolves around StandardServletMultipartResolver vs. CommonsMultipartResolver as far as I can tell, but I'm not sure. If I use CommonsMultipartResolver I can upload files on any page except for Webflow pages fine and UTF-8 encoding works as well on all pages. However on the Webflow pages an exception is thrown trying to access the file . If I use StandardServletMultipartResolver then all of the file uploads work, including Webflow, but on any page that has a UTF-8 character, e.g., caractère, I get garbage.

更奇怪的是，当我使用Commons解析器时，我在FireBug中看到文件正在发布.另外，如果我调试了来自Webflow的RequestContext，我还可以看到文件在请求的深处埋藏了4个层次.通用解析程序的代码(有关标准解析程序代码，请参见帖子结尾):

The wierd thing is I can see in FireBug that the file is being posted when I use the commons resolver. Also, if I debug the RequestContext coming from Webflow I can also see the file buried 4 levels deep in requests. The code for the common resolver (see end of post for the standard resolver code):

public FileResult uploadFile(Recipe recipe, RequestContext requestContext) {
    ServletExternalContext context = (ServletExternalContext) requestContext.getExternalContext();
    MultipartHttpServletRequest multipartRequest = new DefaultMultipartHttpServletRequest((HttpServletRequest)context.getNativeRequest());
    MultipartFile file = multipartRequest.getFile("file");

那么，这是Spring Security问题还是Spring Webflow问题?我怀疑如果我可以正确地将RequestContext强制转换到上面，公共解析器就可以工作，但是我尝试了很多没有运气的组合.任何对此的指导将不胜感激.

So, is this a Spring Security issue or a Spring Webflow problem? I suspect the commons resolver would work if I could cast the RequestContext above correctly, but I've tried numerous combinations with no luck. Any guidance on this would be greatly appreciated.

以下是一些相关的配置和代码:

Here are some relevant configurations and code:

WebMvcConfig

@Bean
public CommonsMultipartResolver filterMultipartResolver() {
    CommonsMultipartResolver resolver = new CommonsMultipartResolver();
    resolver.setDefaultEncoding("UTF-8");
    return resolver;
}

SecurityConfig

@Override
protected void configure(HttpSecurity http) throws Exception {
    CharacterEncodingFilter characterEncodingFilter = new CharacterEncodingFilter();
    characterEncodingFilter.setEncoding("UTF-8");
    characterEncodingFilter.setForceEncoding(true);

    http
    //.csrf().disable()
    .addFilterBefore(characterEncodingFilter, CsrfFilter.class)
    ...more settings...

SecurityInitializer

@Override
protected void beforeSpringSecurityFilterChain(ServletContext servletContext) {
    insertFilters(servletContext, new MultipartFilter());
}

Webflow操作

<action-state id="uploadFile">
    <evaluate expression="fileActions.uploadFile(recipe, flowRequestContext)"/>
    <transition to="review"/>
</action-state>

上传文件方法

public FileResult uploadFile(Recipe recipe, RequestContext requestContext) {
    ServletExternalContext context = (ServletExternalContext) requestContext.getExternalContext();
    MultipartHttpServletRequest multipartRequest = new StandardMultipartHttpServletRequest((HttpServletRequest)context.getNativeRequest());
    MultipartFile file = multipartRequest.getFile("file");
    ...rest of code to save the file...