![](./icons/emoticons/forbidden.gif) | Jakarta Commons Fileupload Dependencies
When using Jakarta's Commons Fileupload, eg.
webwork.multipart.parser=jakarta
The following libraries are required
- jakarta commons io
- jakarta commons codec
- jakarta commons fileupload
- jakarta commons logging
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![](./icons/emoticons/forbidden.gif) | Limiting Upload File size using WebWork and Jakarta Commons Fileupload
When using WebWork and Jakarta's Common Fileupload with intend to limit upload file size, do take note
that the following entry will be ignored
webwork.multipart.maxSize=2097152
Instead use a the maximumSize property in FileUploadInterceptor eg.
<action ...>
<interceptor-ref name="fileUpload">
<param name="maximumSize"> .... </param>
</interceptor-ref>
....
</action>
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Interceptor that is based off of MultiPartRequestWrapper, which is automatically applied for any request that
includes a file. It adds the following parameters, where [File Name] is the name given to the file uploaded by the
HTML form:
- [File Name] : File - the actual File
- [File Name]ContentType : String - the content type of the file
- [File Name]FileName : String - the actual name of the file uploaded (not the HTML name)
You can get access to these files by merely providing setters in your action that correspond to any of the three
patterns above, such as setDocument(File document), setDocumentContentType(String contentType), etc.
See the example code section.
This interceptor will add several field errors, assuming that the action implements ValidationAware.
These error messages are based on several i18n values stored in webwork-messages.properties, a default i18n file
processed for all i18n requests. You can override the text of these messages by providing text for the following
keys:
- webwork.messages.error.uploading - a general error that occurs when the file could not be uploaded
- webwork.messages.error.file.too.large - occurs when the uploaded file is too large
- webwork.messages.error.content.type.not.allowed - occurs when the uploaded file does not match the expected
content types specified
Parameters
- maximumSize (optional) - the maximum size (in bytes) that the interceptor will allow a file reference to be set
on the action. Note, this is not related to the various properties found in webwork.properties.
Default to approximately 2MB.
- allowedTypes (optional) - a comma separated list of content types (ie: text/html) that the interceptor will allow
a file reference to be set on the action. If none is specified allow all types to be uploaded.
Extending the Interceptor
You can extend this interceptor and override the #acceptFile method to provide more control over which files
are supported and which are not.
Examples
<action name="doUpload" class="com.examples.UploadAction">
<interceptor-ref name="fileUpload"/>
<interceptor-ref name="basicStack"/>
<result name="success">good_result.ftl</result>
</action>
</pre>
And then you need to set encoding <code>multipart/form-data</code> in the form where the user selects the file to upload.
<pre>
<ww:form action="doUpload" method="post" enctype="multipart/form-data">
<ww:file name="upload" label="File"/>
<ww:submit/>
</ww:form>
</pre>
And then in your action code you'll have access to the File object if you provide setters according to the
naming convention documented in the start.
<pre>
public com.examples.UploadAction implemements Action {
private File file;
private String contentType;
private String filename;
public void setUpload(File file) {
this.file = file;
}
public void setUploadContentType(String contentType) {
this.contentType = contentType;
}
public void setUploadFileName(String filename) {
this.filename = filename;
}
...
}
</pre>
Setting parameters example:
<interceptor-ref name="fileUpload">
<param name="allowedTypes">
image/png,image/gif,image/jpeg
</param>
</interceptor-ref>
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