How do we upload files

xml 代码

How do we upload files
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Added by tm_jee, last edited by Ted Husted on Jan 28, 2007  (view change)
You can obtain the MultipartRequestWrapper from the ServletActionContext or by utilizing the fileUpload interceptor. The fileUpload interceptor is preferred.

Ask the ServletActionContext
MultipartRequestWrapper multipartRequest = ((MultipartRequestWrapper)ServletActionContext.getRequest())
The MultipartRequestWrapper provideds access methods such as getFiles, getFile, getContentType, hasErrors, getErrors, and so forth, so that you can process the file uploaded.

Utilize the fileUpload Interceptor
 _Preferred_

Ensure that {{fileUpload }} Interceptor is included in the Action's stack.
 The default stack already includes {{fileUpload }}.
Ensure that the HTML form sets the enctype and specifies on or more file type inputs.
<form name="myForm" enctype="multipart/form-data">
     <input type="file" name="myDoc" value="Browse ..." />
     <input type="submit" />
  </form>
Ensure that the Action provides one or more fileUpload mutator methods, with names that correspond to name of the file type input.
public void setMyDoc(File myDoc)
public void setMyDocContentType(String contentType)
public void setMyDocFileName(String filename)
The Action may also provide the corresponding accessor methods.
public File getMyDoc()
public ContentType getMyDocContentType()
public String getMyDocFileName()
Handling multiple files
When multiple files are uploaded by a form, the files are represented by an array.

Given:

<form name="myForm" enctype="multipart/form-data">
      <input type="file" name="myDoc" value="Browse File A ..." />
      <input type="file" name="myDoc" value="Browse File B ..." />
      <input type="file" name="myDoc" value="Browse File C ..." />
      <input type="submit" />
   </form>
The Action class can define file handling methods that accept an array.

public void setMyDoc(File[] myDocs)
public void setMyDocContentType(String[] contentTypes)
public void setMyDocFileName(String[] fileNames)
The uploaded files can be handled by iterating through the appropriate array.

Extra Information
Property  Default
struts.multipart.parser  Commons FileUpload
struts.multipart.saveDir  javax.servlet.context.tempdir as defined by container
struts.multipart.maxSize  Approximately 2M

@see struts.properties
@see org.apache.struts2.dispatcher.FilterDispatcher#doFilter(SerlvetRequest, ServletRepsonse, FilterChain)
@see org.apache.struts2.dispatcher.DispatcherUtil#wrapRequest(HttpServletRequest, SerlvetContext)
@see org.apache.struts2.dispatcher.multipart.MultipartRequestWrapper
@see org.apache.struts2.interceptor.FileUploadInterceptor

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