Re[2]: Show a picture from DB

[Max Grigoriev <da...@mail.ru>]

But if i want to show not only images but also word documents, pdf and
etc. It will not work.


Tuesday, September 16, 2003, 3:24:03 PM, you wrote:

HK> Take a look at the ChartService in the workbench. Basically, you change
HK> your service link to an Image and create an Asset that returns the URL
HK> to your ViewDocService. Something like the following...

HK> Template:
HK> <img jwcid="@Image" image="ognl:externalDocAsset"..../>

HK> Asset:
HK> public class ExternalDocAsset extends AbstractAsset
HK> {
HK>     // Take a look at ChartAsset in workbench to see what methods to
HK> implement
HK> }

HK> Service:
HK> ... you already have this.

HK> Page:
HK> .....
HK>     public IAsset getExternalDocAsset()
HK>     {
HK>        return new ExternalDocAsset(getRequestCycle(), this);
HK>     }
HK> .....

HK> -Harish


HK> Max Grigoriev wrote:

>>Hello tapestry-user,
>>
>>  I try to implememt my own service for showing pictures:
>>
>>  My Service:
>>
>>public class ViewDocumentService extends AbstractService {
>>  public static final String VIEW_DOC_SERVICE = "viewdoc";
>>
>>  public String getName() {
>>    return VIEW_DOC_SERVICE;
>>  }
>>
>>  public void service(IEngineServiceView iEngineServiceView, IRequestCycle cycle,
>>                      ResponseOutputStream responseOutputStream)
>>      throws ServletException, IOException {
>>    HttpServletResponse response =
>> cycle.getRequestContext().getResponse();
>>    String[] params = getServiceContext(cycle.getRequestContext());
>>    if (params == null || params.length != 1) {
>>      throw new ApplicationRuntimeException(
>>          Tapestry.format("service-single-context-parameter", VIEW_DOC_SERVICE));
>>    }
>>    Visit visit = (Visit) cycle.getEngine().getVisit();
>>    try {
>>      //My picture holder
>>      ExternalDocument extDoc =
>> ReportHome.getExternalDocument(params[0],
>>          visit.getReport(), null);
>>      response.setContentType("image/jpeg");
>>      byte[] buf = extDoc.getValue();
>>      response.getOutputStream().write(buf);
>>
>>      //for debug only...
>>      File f = new File(extDoc.getName());
>>      FileOutputStream out = new FileOutputStream(f);
>>      out.write(buf);
>>      out.close();
>>      //end for debug...
>>    } catch (MiddleException e) {
>>      e.printStackTrace();
>>    }
>>  }
>>
>>  public ILink getLink(IRequestCycle cycle, IComponent iComponent, Object[] objects) {
>>    if (objects == null || objects.length == 0)
>>      throw new ApplicationRuntimeException(
>>          Tapestry.format("service-requires-parameters", VIEW_DOC_SERVICE));
>>
>>    String docName = (String) objects[0];
>>    String[] context = new String[]{docName};
>>
>>    return constructLink(cycle, VIEW_DOC_SERVICE, context, new Object[0], true);
>>
>>  }  
>>
>>  And i invoke this service like this:
>>  
>><a jwcid="@ServiceLink"
>>  
>> service="ognl:@com.clearview.feedback.web.ViewDocumentService@VIEW_DOC_SERVICE"
>>   parameters="ognl:bean.currExtDocName"><span jwcid="@Insert"
>> value="ognl:bean.currExtDocName"/></a>
>>
>>But i don't see a picture. I tried to show picture and write it to
>>file. The picture saved in the file is OK, so i think i do something
>>wrong with tapestry.
>>
>>Has someone done such thing already ? And where is my fault ?
>>
>>Thank's
>>
>>  
>>


HK> ---------------------------------------------------------------------
HK> To unsubscribe, e-mail:
HK> tapestry-user-unsubscribe@jakarta.apache.org
HK> For additional commands, e-mail:
HK> tapestry-user-help@jakarta.apache.org




-- 
Best regards,
 Max                            mailto:darkit@mail.ru


---------------------------------------------------------------------
To unsubscribe, e-mail: tapestry-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: tapestry-user-help@jakarta.apache.org