Hi all,
I am having a little difficulty with what I imagine is a very common use
case: displaying a user's profile image alongside their personal details
following successful login. Displaying the JavaBean strings served up by
Hibernate is easy. Just displaying the database Blob (stored as a byte
array in the JavaBean entity) is proving more challenging.
[Welcome.tml]
...
<div>
<img src="${imageLink}" />
<strong>${user.firstName} ${user.lastName}</strong><br/>
User name: "${user.userName}"<br/>
E-mail: ${user.email}<br/>
</div>
...
[Welcome.java]
...
public void onActivate(){
user = authenticator.getLoggedUser();
company = user.getCompany();
ports = company.getPorts();
}
public Link getImageLink(){
return pageLink.createPageRenderLinkWithContext(BlobImage.class,
user.getImage());
}
...
[BlobImage.java]
package com.example.harbour.pages;
import org.apache.tapestry5.StreamResponse;
import org.apache.tapestry5.services.Response;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* Class created for displaying Blob (profile) images read from the
database, as per the below howto:
*
https://stackoverflow.com/questions/13213236/tapestry-display-blob-using-markup
*/
public class BlobImage {
public StreamResponse onActivate(byte[] byteArray){
//Retrieve your image using the context parameter(s)
final InputStream imageStream = new ByteArrayInputStream(byteArray);
return new StreamResponse(){
@Override
public InputStream getStream() throws IOException {
return imageStream;
}
@Override
String getContentType(){
return "image/png";
}
@Override
void prepareResponse(Response response){}
};
}
}
[The Compilation Error]
[ERROR] Failed to execute goal
org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile
(default-compile) on project harbour: Compilation failure: Compilation
failure:
[ERROR]
\Users\Setup\Desktop\IdeaProjects\Harbour\src\main\java\com\example\harbour\pages\BlobImage.java:[37,17]
error: prepareResponse(Response) in <anonymous
com.example.harbour.pages.BlobImage$1> cannot implement
prepareResponse(Response) in StreamResponse
[ERROR]
\Users\Setup\Desktop\IdeaProjects\Harbour\src\main\java\com\example\harbour\pages\BlobImage.java:[32,19]
error: getContentType() in <anonymous
com.example.harbour.pages.BlobImage$1> cannot implement getContentType()
in StreamResponse
Is creating a separate image streaming class, like above, the best way of
displaying a database image in a Tapestry 5 template, as the 'howto' I
followed is 5+ years' old now? I couldn't find any newer examples on the
Tapestry website.
Thanks for your assistance,
Chris.
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