Dave,
Thanks for the suggestion, but either that doesn't work or I'm doing
something quite wrong (A wise person would bet on the latter).
I have attached a snipped version of my Action.java. When I run it, I
get the following error message:
[ERROR]~2012-02-23-22.18.52.412UTC~EDJ~Can not find a
java.io.InputStream with the name [fileInputStream] in the invocation
stack. Check the <param name="inputName"> tag specified for this action.
According to the javadocs. ByteArrayInputStream extends
java.io.InputStream.
John
On Thu, 2012-02-23 at 16:33 -0500, Dave Newton wrote:
> Use a ByteArrayInputStream [1]?
>
> Dave
>
> [1]
> http://docs.oracle.com/javase/6/docs/api/java/io/ByteArrayInputStream.html
>
> On Thu, Feb 23, 2012 at 4:23 PM, John W. Himpel <[email protected]> wrote:
>
> > Good afternoon,
> >
> > I have retrieved a jpg image as a byteArray from a database but I don't
> > know how to put the contents of the byteArray into a FileInputStream to
> > be sent back to the browser. I am using the Struts 2 StreamResult for
> > the data transfer to the browser (Question: Am I trying to put a square
> > peg into a round hole?). I would prefer not store the byteArray into a
> > temporary file and then give the StreamResult a pointer to the temporary
> > file. The desired end result is the ability for the user to extract a
> > jpg file from the database and store it on their local workstation.
> >
> > Any suggestions or referrals would be greatly appreciated.
> >
> > John
> >
> >
> >
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> >
> >
package <snip>.photo.web.actions;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.struts2.convention.annotation.Result;
import org.apache.struts2.convention.annotation.Results;
import com.opensymphony.xwork2.ActionSupport;
<snip>
</snip>
@Results
(
{
@Result(name = "success", location = "downloadPage", type = "tiles"),
@Result(name = "error", location = "error", type = "tiles"),
@Result(name = "download", type = "stream",
params = {
"contentType", "application/octet-stream",
"inputName", "fileInputStream",
"bufferSize", "1024"
}
)
}
)
public class DownloadAction extends ActionSupport {
<snip>
</snip>
/**
* Creates a <tt>DownloadAction</tt> object.
*/
public DownloadAction() {
super();
}
/**
* TODO Add description
*
* @return The result, which will determine what action or JSP will be
* called after execution of the method.
*/
// TODO Add @Validations, as needed.
public String execute() {
// NOTE: The execute() method is the default one called by Struts 2 if
// the action name matches the class name, where camel-case names are
// converted to dashes. See
// http://struts.apache.org/2.1.6/docs/convention-plugin.html for more
// information.
// Initialize the forward name with the "success" value.
String forward = "success";
try {
// TODO Finish implementing this method (e.g., add a service call).
Image imagePhoto = fetchImageByEmployeeId(identifier);
ByteArrayInputStream fileInputStream = new ByteArrayInputStream(imagePhoto.getPhotoImage());
forward = "download";
}
catch (Exception e) {
LOGGER.error("Caught an error while executing the action.", e);
}
return forward;
<snip>
</snip>
/**
* inputStream - Used to return the photo image
*/
private ByteArrayInputStream fileInputStream;
/**
* @return the fileInputStream
*/
public InputStream getFileInputStream() {
return fileInputStream;
}
/**
* @param inputStream the inputStream to set
*/
public void setFileInputStream(ByteArrayInputStream fileInputStream)
{
this.fileInputStream = fileInputStream;
}
<snip>
</snip>
}
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