[ http://jira.codehaus.org/browse/DISPL-13?page=comments#action_81643 ] mark commented on DISPL-13: ---------------------------
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http://www.solicom.de/mb451_2/156.shtml - > PDF Export > ---------- > > Key: DISPL-13 > URL: http://jira.codehaus.org/browse/DISPL-13 > Project: DisplayTag > Issue Type: Improvement > Components: Export > Affects Versions: 1.0 RC2 > Reporter: fabrizio giustina > Assigned To: fabrizio giustina > Fix For: 1.0 RC2 > > Attachments: dt_pdf.diff, dt_pdf_java.zip > > Time Spent: 1 day > > ==== > imported from sf tracker > id 1026408 > submitted by Ivan Markov - ivan_markov > http://sourceforge.net/tracker/index.php?func=detail&group_id=73068&atid=536613&aid=1026408 > > ==== > PDF Export > ---------- > Our main goal while developing this patch was to do as little changes as > possible in the existing display tag code. > You know - the smaller the patch, the easier to be accepted. :) > We had to change a little the code of BaseExportView, ExportViewFactory & > MediaTypeEnum. > The changes in these classes revolve around our idea to make the export stuff > in display tag *extensible*. > The current set of exported formats supported by DT (CSV, Tab-delimited > Excel, HTML, XML) all do their stuff relying on core J2SE features only. > PDF, however, is complex enough so as we needed to drag a dependency on IText > (http://www.lowagie.com/iText/). Since we didn't want to make display tag > itself dependent on IText, we instead provided means for the user to register > in DT a new exporter. > With our patch, user needing custom export has to: > a.1) Write the exporter, by extending BaseExportView. That's what we did for > PDF: our PDFView extends BaseExportView. > a.2) The exporter should have a constructor with the same parameters as the > one in BaseExportView, because our patch uses reflection to instantiate the > appropriate exporter. > b) Somewhere in the webapp, probably in the init() method of the main > servlet, the user needs to issue: > MediaTypeEnum.registerView("<new-exporter-name>", <new-exporter-class>); > For our PDF export, we'll do: > MediaTypeEnum.registerView("pdf", PdfView.class); > We'll consider providing means for specifying this in the table.properties > file too. > Note that only the changes to BaseExportView/ExportViewFactory/MediaTypeEnum > are important. > Our PDFView does not and SHOULD NOT rely on any other DT API. > I would imagine, you guys wouldn't like dependency on IText, so PDFView can > find its way in an optional package. > In future, I suppose XLS export may emerge, based on JExcelAPI > (jexcelapi.sf.net), which provides richer formatting means than the regular > CSV/Tab-delimited Excel export. > Compiling The Code > ------------------ > You can try to apply the attached paging_and_pdf.diff file (diff to latest > CVS as of Sep 11 2004). Note that it will introduce dependency on IText, > because of PDFView, which is included for demoing. > You can also just unzip the attached archive which contains the latest CVS DT > patched. Also, Eclipse project files are provided within. > !NOTE: You need to move all 3rd party jar dependencies in WEB-INF/lib (for > demoing) INCLUDING itext-1.02b-custom.jar (from > http://www.lowagie.com/iText/download.html) > so that you can just point the servlet engine to ... /displaytag2/src/webapp . -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://jira.codehaus.org/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira ------------------------------------------------------------------------- Take Surveys. Earn Cash. 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