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JSP with multipart form

 
Ranch Hand
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Can I find out why is it is I use multipart/form-data in the following, the JSP does not work?

Thank you.


 
Greenhorn
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what is the error u get?
 
Chuan Ren
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There is no error message. the page just gone blank and did not go to the second condition. very weird.
 
Greenhorn
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There are many solutions. I have also listed the advantages of each.

Problem: javax.servlet.HttpServletRequest.getParameter(String) returns null when the ContentType is multipart/form-data

Solutions:

Solution A: (Advantage: Free Distribution & Widely used)

1. Download one of the versions of UploadFile from http://jakarta.apache.org/commons/fileupload/
2. Invoke parseRequest(request) on org.apache.commons.fileupload.FileUploadBase which returns list of org.apache.commons.fileupload.FileItem objects.
3. Invoke isFormField() on each of the FileItem objects. This determines whether the file item is a form paramater or stream of uploaded file.
4. Invoke getFieldName() to get parameter name and getString() to get parameter value on FileItem if it's a form parameter. Invoke write(java.io.File) on FileItem to save the uploaded file stream to a file if the FileItem is not a form parameter.

Solution B (Advantage: Easy to use)

1. Download http://www.servlets.com/cos/index.html
2. Invoke getParameters() on com.oreilly.servlet.MultipartRequest

Solution C (Restricted to those applications that use this framework):

Use Struts. Struts 1.1 handles this automatically.
 
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