This will probably help (3.0.3):
1: The Service:
package services;
import java.io.IOException;
import javax.servlet.ServletException;
import org.apache.tapestry.IComponent;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.engine.AbstractService;
import org.apache.tapestry.engine.IEngineServiceView;
import org.apache.tapestry.engine.ILink;
import org.apache.tapestry.request.ResponseOutputStream;
import survey.InternalImage;
import data.HibHelper;
public class InternalImageServer extends AbstractService {
public static final String SERVICE_NAME = "InternalImageServer";
public ILink getLink(IRequestCycle cycle, IComponent component,
Object[] parms) {
String[] context;
String pageName = component.getPage().getPageName();
String idPath = component.getIdPath();
if (idPath != null) {
context = new String[2];
context[1] = idPath;
} else
context = new String[1];
context[0] = pageName;
return constructLink(cycle, SERVICE_NAME, context, parms,
true);
}
public void service(IEngineServiceView acrg0, IRequestCycle cycle,
ResponseOutputStream response) throws
ServletException, IOException {
Object[] parms = this.getParameters(cycle);
String id = (String) parms[0];
InternalImage ii = (InternalImage)
HibHelper.getSession().get(InternalImage.class, id);
response.setContentType(ii.getType());
response.write(ii.getData());
}
public String getName() {
return SERVICE_NAME;
}
}
Step 2: The ImageLink java file
package components;
import org.apache.tapestry.BaseComponent;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.engine.IEngineService;
import org.apache.tapestry.engine.ILink;
import services.InternalImageServer;
public abstract class ImageLink extends BaseComponent {
private String fImageId;
private String fAlt = null;
private String fTitleText = null;
public String getAlt() {
if (fAlt == null)
fAlt = "Alt";
return fAlt;
}
public void setAlt(String alt) {
fAlt = alt;
}
public String getTitleText() {
if (fTitleText == null)
fTitleText = "Title";
return fTitleText;
}
public void setTitleText(String titleText) {
fTitleText = titleText;
}
public String getImageId() {
return fImageId;
}
public void setImageId(String imageId) {
fImageId = imageId;
}
public String getLink() {
IRequestCycle cycle = getPage().getRequestCycle();
IEngineService service =
cycle.getEngine().getService(InternalImageServer.SERVICE_NAME);
Object[] parms = new Object[1];
parms[0] = fImageId;
ILink link = service.getLink(cycle, this, parms);
return link.getAbsoluteURL();
}
}
Part 3: The ImageLink .jwc
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE component-specification PUBLIC
"-//Apache Software Foundation//Tapestry Specification 3.0//EN"
"http://jakarta.apache.org/tapestry/dtd/Tapestry_3_0.dtd";>
<!-- generated by Spindle, http://spindle.sourceforge.net -->
<component-specification class="components.ImageLink"
allow-body="yes"
allow-informal-parameters="yes">
<description>add a description</description>
<parameter name="imageId" required="yes" type="java.lang.String"
direction="in"/>
<parameter name="alt" required="no" type="java.lang.String"
direction="in" />
<parameter name="titleText" required="no" type="java.lang.String"
direction="in" />
</component-specification>
Part 4: The Imagelink html
<span jwcid="@Any" element="img" src="ognl:getLink()" alt="ognl:alt"
title="ognl:titleText"/>
> -----Original Message-----
> From: skydiverx [mailto:[EMAIL PROTECTED]
> Sent: Sunday, January 29, 2006 3:43 PM
> To: [email protected]
> Subject: Images from DB
>
> Apologies all around if I have missed the obvious.
>
> What would be best practise if I have images stored as BLOBs in a DB and
> want to display those through a tag?
>
> This has to be a fairly common problem and yet we have failed to find some
> mention of this in the docs.
>
> I dont know if it's relevant but we use Hibernate on top of MySQL.
>
> Thank you in advance for your advice.
>
> Tom.
>
>
> -------------------- m2f --------------------
>
> Sent from www.TapestryForums.com
>
> Read this topic online here: <<topic_link>>
>
> http://www.tapestryforums.com/viewtopic.php?p=13981#13981
>
> -------------------- m2f --------------------
>
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