Java 如何从 RequestContextHolder 获取 MultipartHttpServletRequest？
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How to get a MultipartHttpServletRequest from RequestContextHolder?
提问by jaseFace
I have configured the access decision manager to check a request before being processed by the servlet the key line is:-
我已将访问决策管理器配置为在被 servlet 处理之前检查请求，关键行是：-
HttpServletRequest request = (HttpServletRequest) RequestContextHolder.currentRequestAttributes().getRequest();
All good. However when the request is enctype="multipart/form-data"how do I get hold of the MultipartHttpServletRequestwhen RequestContextHolder.currentRequestAttributes().getRequest()only returns HttpServletRequest?
都好。然而当请求enctype="multipart/form-data"我怎么得到的保持MultipartHttpServletRequest时，RequestContextHolder.currentRequestAttributes().getRequest()只有收益HttpServletRequest？
I am using spring 2.5.
我正在使用 spring 2.5。
回答by matt b
Have you tried casting to MultipartHttpServletRequest?
你试过投射到MultipartHttpServletRequest吗？
回答by skaffman
MultipartHttpServletRequestis n Spring-specific interface for handling multipart form submissions. The default implementation is DefaultMultipartHttpServletRequest, which has a constructor that takes a HttpServletRequest.
MultipartHttpServletRequest是用于处理多部分表单提交的特定于 Spring 的接口。默认实现是DefaultMultipartHttpServletRequest，它有一个带有HttpServletRequest.
So:
所以：
HttpServletRequest originalRequest = ((ServletRequestAttributes) RequestContextHolder.currentRequestAttributes()).getRequest();
MultipartHttpServletRequest multiPartRequest = new DefaultMultipartHttpServletRequest(originalRequest);
回答by vcg
If you are using spring-mvc, make sure you put this line
如果您使用的是 spring-mvc，请确保放置此行
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver" />
in your app-config.xml.
在您的 app-config.xml 中。
This worked for me.
这对我有用。
回答by varobj
I don't think you can get DefaultMultipartHttpServletRequest from RequestContextHolder. DefaultMultipartHttpServletRequest really implements HttpServletRequest. But there're 2 request instances if you use CommonsMultipartResolver. One is DefaultMultipartHttpServletRequest instance, and another is HttpServletRequest instance. Actually I don't know how to get the first instance from RequestContextHolder. You can get the second instance from it.
我认为您无法从 RequestContextHolder 获得 DefaultMultipartHttpServletRequest。DefaultMultipartHttpServletRequest 真正实现了 HttpServletRequest。但是如果您使用 CommonsMultipartResolver，则有 2 个请求实例。一个是 DefaultMultipartHttpServletRequest 实例，另一个是 HttpServletRequest 实例。实际上我不知道如何从 RequestContextHolder 获取第一个实例。您可以从中获取第二个实例。
回答by Anant Laxmikant Bobde
Apart from having
除了拥有
<form method=<method> action=<url> enctype="multipart/form-data"></form>
you have to have
你必须有
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver" />
in your spring configuration file.
在您的 spring 配置文件中。
Here is nice tutorial on the same
这是关于相同的很好的教程
