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Generate PDF File in Portlet

Introduction #

Liferay has a "Reports" portlet, which is a full-fledged report application. It's cool!

Sometimes a client may ask for a PDF file for simple reporting purposes. This can be a small portlet using a ResourceURL. The ResourceURL is as specified in JSR-286.

This method uses iText for generating PDF's. The AGPL that governs iText does not allow its use for closed-source projects. Use Liferay's OpenOffice/LibreOffice integration for these type projects.

Environment #

  • Liferay 5.1.2
  • Tomcat 6.0
  • MySQL

JSP Side #

<input type="button" value="Submit"
    onClick="location.href = '<portlet:resourceURL><portlet:param name="reportType" value="pdf" /></portlet:resourceURL>'" />

Portlet Java Code #

public void serveResource(ResourceRequest req, ResourceResponse res)
        throws PortletException, IOException {

        String rType = ParamUtil.getString(req, "reportType");
        
        HttpServletRequest request = PortalUtil.getHttpServletRequest(req);
        
        HttpSession session = request.getSession();
        
        ThemeDisplay themeDisplay = (ThemeDisplay)req.getAttribute(WebKeys.THEME_DISPLAY);
        
        Company company = themeDisplay.getCompany();
        
        if(rType != null && rType.equals("pdf")) {
        	
        	try {                
                    String msg = "Latest Weather Report";
                    
                    Document document = new Document();
                    
                    ByteArrayOutputStream baos = new ByteArrayOutputStream();
                    
                    PdfWriter.getInstance(document, baos);
                    
                    document.open();
                    document.add(new Paragraph(msg));
                    document.add(Chunk.NEWLINE);
                    document.add(new Paragraph("It is a sunny day today."));
                    document.close();
                    
                    res.setContentType("application/pdf");
                    res.addProperty(HttpHeaders.CACHE_CONTROL, "max-age=3600, must-revalidate");
                    
                    res.setContentLength(baos.size());
                    
                    OutputStream out = res.getPortletOutputStream();
                    baos.writeTo(out);
                    
                    out.flush();
                    out.close();
        	} catch (Exception e2) {
                    e2.System.out.println("Error in " + getClass().getName() + "\n" + e2);
        	}
        }
        else {
            try {
                Workbook wb = new HSSFWorkbook();
                
                CreationHelper createHelper = wb.getCreationHelper();
                
                Sheet sheet = wb.createSheet("new sheet");

                Row row = sheet.createRow((short)0);
                Cell cell = row.createCell(0);
                cell.setCellValue(1);

                row.createCell(1).setCellValue(1.2);
                row.createCell(2).setCellValue(
                createHelper.createRichTextString("This is a string"));
                row.createCell(3).setCellValue(true);

                res.setContentType("application/vnd.ms-excel");
                res.addProperty(
                HttpHeaders.CACHE_CONTROL, "max-age=3600, must-revalidate");

                OutputStream out = res.getPortletOutputStream();
                wb.write(out);
                out.flush();
                out.close();
            } catch (Exception e) {
                System.out.println("Exception occurred ...");
            }
        }
}

Future Enhancement #

(1) Generate an Excel report

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Kommentare
Antworten im Thread Autor Datum
Hi I just want to know what jar files I need... Mohammed Azam 5. November 2012 05:00
The PDF generation seems to use iText PDF... Adam Victor Nazareth Brandizzi 5. November 2012 05:01
good morning, I would ask how I can save the pdf? josmar javier Alarcon Bothia 11. Februar 2013 06:08
Thanks for Sharing.it is working. we need to... Ravi Teja 21. März 2013 05:02
Please follow this link to get sample portlet... Ravi Teja 22. März 2013 05:13
Ravi Teja your link is not working djo vitch 6. Juni 2013 03:25
Hi Vitch, Please go to below link. and there... Ravi Teja 1. Oktober 2013 22:51
How to display the values in table instead of... Kalai Arasan 30. September 2013 05:16
Hi Kalai arasan, Please go throw this link... Ravi Teja 1. Oktober 2013 22:47
I wants to know the jar files needs to be... Kalai Arasan 19. November 2013 22:30
PDF generation is working fine. Bur i wants to... Kalai Arasan 19. November 2013 22:32
I wants to know either i create the class for... Kalai Arasan 19. November 2013 22:35
Hi! i used the code to generate pdf that works... Kalai Arasan 1. Dezember 2013 23:38
We can refresh portlet after download file?... Vasily Polyakov 17. Februar 2014 04:27
hi How can i extract lpkg file to see war file veeresh hosamani 11. April 2014 01:46

Hi

I just want to know what jar files I need to import packages.
Gepostet am 05.11.12 05:00.
The PDF generation seems to use iText PDF (http://itextpdf.com/) and the other report seems to be generated by Apache POI (http://poi.apache.org/).
Gepostet am 05.11.12 05:01 als Antwort auf Mohammed Azam.
good morning, I would ask how I can save the pdf?
Gepostet am 11.02.13 06:08.
Thanks for Sharing.it is working.
we need to add i text jar in lib.
Gepostet am 21.03.13 05:02 als Antwort auf josmar javier Alarcon Bothia.
Please follow this link to get sample portlet
.it will open in popwindow as well as ask for download.
(http://www.liferay.com/community/forums/-/message_boards/message/22909­051)
Gepostet am 22.03.13 05:13 als Antwort auf Ravi Teja.
Gepostet am 06.06.13 03:25 als Antwort auf Ravi Teja.
How to display the values in table instead of paragraph in pdf?
Gepostet am 30.09.13 05:16.
Hi Kalai arasan,

Please go throw this link (http://tutorials.jenkov.com/java-itext/table.html).
Gepostet am 01.10.13 22:47 als Antwort auf Kalai arasan.
Hi Vitch,

Please go to below link. and there you can find ( pdfgeneration-portlet.rar )
https://www.liferay.com/community/forums/-/message_boards/message/22903036
Gepostet am 01.10.13 22:51 als Antwort auf djo vitch.
I wants to know the jar files needs to be included!
Gepostet am 19.11.13 22:30.
PDF generation is working fine. Bur i wants to generate excel sheet that's the problem arise with import files because of missing jar files.
Gepostet am 19.11.13 22:32.
I wants to know either i create the class for Workbook wb = new HSSFWorkbook(); or import file for Workbook and HSSFWorkbook.
Gepostet am 19.11.13 22:35 als Antwort auf Kalai arasan.
Hi! i used the code to generate pdf that works fine, But both pdf and excel will appears in the name of the site page automatically. How can i give the name for documents manually.
Gepostet am 01.12.13 23:38.
We can refresh portlet after download file? File downloaded successfully, but submit button after this look like pressed. Thanks.
Gepostet am 17.02.14 04:27.
hi
How can i extract lpkg file to see war file
Gepostet am 11.04.14 01:46.