How to show Report preview in Web Application?

[sandun.jaya]

I'm using Jasper Report with JSF web Application.Everything is ok to my application.But I couldn't show report preview before exoprt as pdf,xls....

Cannot use Jasper Viewer because it is a Swing component.So how can I do it?

[Ankur Gupta]

Hi sandun.jaya,

 

Actually in a case which I came across is what I am doing is that in a web application , I am running and compiling the report and then providing the user , download link for the same. 

In you case what you can do is instead of the download link , you could show the same file in the window or as you desire 

 

the code snippets are as follows:

 

   // 1- export to PDF to the specified path

   String filePath1 = getServletContext().getRealPath("") + File.separator +"sample_report.pdf";

   JasperExportManager.exportReportToPdfFile(jasperPrint, filePath1);

 

   // 2- export to HTML to the specified path

   String filePath2 = getServletContext().getRealPath("") + File.separator +"sample_report.html";

   JasperExportManager.exportReportToHtmlFile(jasperPrint, filePath2 );

 

  // 3- export to XLS to the specified path

  String filePath3 = getServletContext().getRealPath("") + File.separator +"sample_report.xls";

  JRXlsExporter exporter = new JRXlsExporter();

  exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);

  exporter.setParameter(JRExporterParameter.OUTPUT_FILE_NAME, filePath3 );

  exporter.exportReport();

 

Here I am generating the files in the build/web  folder . Then these files I have given choice to user to download.

 

The download link is generated as .

 

out.print("1.<a href='GetPDF'>Get PDF</a><br/>");

 

Here I have refered to GetPDF Servlet.The content of GetPDF servlet is :

 

                    // Gets the output Stream

                    stream = response.getOutputStream();

                    

                    /*sets response headers tell browser program going to return an application file instead of html page*/

                    response.setContentType("application/pdf"); // The mime type of the file should be taken care of 

                    response.setDateHeader("Expires", 0);

                    response.addHeader("Content-Disposition",

                     "attachment; filename=ReportExport.pdf");// File name should also be taken care of .

                    response.setContentLength((int) file.length());

                    

                    // Converts the file in input buffered Stream

                    buf = new BufferedInputStream(new FileInputStream(file));

                    int readBytes = 0;

                    

                    //copies binary contect to output stream

                    while ((readBytes = buf.read()) != -1)

                     stream.write(readBytes);

                } finally {

                     if (stream != null){

                                stream.flush();

                 }        

                stream.close();

                if (buf != null){

                                buf.close();

                        }        

              }

Hope This helps

 

Thanks,

Ankur