hirondelle.fish.exercise.fileupload
Class FileUploadFilter

Object
  hirondelle.fish.exercise.fileupload.FileUploadFilter

All Implemented Interfaces:

Filter

public final class FileUploadFilter
extends Object
implements Filter

Wrap the underlying request using FileUploadWrapper, such that a file upload can be handled in the same way as a regular form.

The Servlet API does not treat forms which include a file upload control the same as other forms. In particular, the return value for request.getParameter(String) is always null for file upload forms. When this filter is configured for an underlying POST which includes one or more files, then the application can proceed in much the same way as a regular form.

An exception is that the request requires a cast to the specific wrapper class in order to access file-related data. Accessing 'regular' data, however, proceeds normally.

This filter should be configured only for those operations that use a file upload request.

Constructor Summary

FileUploadFilter()

Method Summary

void	destroy()
void	doFilter(ServletRequest aRequest, ServletResponse aResponse, FilterChain aChain)
void	init(FilterConfig aConfig)

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FileUploadFilter

public FileUploadFilter()

Method Detail

init

public void init(FilterConfig aConfig)
          throws ServletException

Specified by:

init in interface Filter

Throws:

ServletException

destroy

public void destroy()

Specified by:

destroy in interface Filter

doFilter

public void doFilter(ServletRequest aRequest,
                     ServletResponse aResponse,
                     FilterChain aChain)
              throws IOException,
                     ServletException

Specified by:

doFilter in interface Filter

Throws:

IOException

ServletException