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Servlet and JasperReports


2004 IR Help

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By: Alan Shiers - ashiers

Servlet and JasperReports

2005-05-30 13:09

HELP!

 

My servlet code is able to execute without any exceptions but my report doesn't appear in the browser at all! I had a look at the source response from the servlet and it looks like this:

 

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<style type="text/css">

a {text-decoration: none}

</style>

</head>

<body text="#000000" link="#000000" alink="#000000" vlink="#000000">

<table width="100%" cellpadding="0" cellspacing="0" border="0">

<tr><td width="50%"> </td><td align="center">

 

</td><td width="50%"> </td></tr>

</table>

</body>

</html>

 

So, the servlet is returning something, just not my report! Any idea what might be causing the problem?

 

Alan

 

 

public void doPost(HttpServletRequest req, HttpServletResponse res)throws ServletException, IOException

{

Connection connection = null;

System.out.println("entering doPost");

res.setContentType("text/html");

PrintWriter out = res.getWriter();

 

String CompanyID = req.getParameter("CompanyID");

String CourseID = req.getParameter("CourseID");

String SubmissionDate = req.getParameter("SubmissionDate");

String DaysMissedAverage = "1-3";

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

java.util.Date today = new java.util.Date();

String ReportDate = sdf.format(today);

String ReportingServletURL = res.encodeRedirectURL("/scholastic/CourseEvalReportProcessor");

 

//create a map of parameters to pass to the report.

Map<String, String> parameters = new HashMap<String,String>();

parameters.put("CompanyID", CompanyID);

parameters.put("CourseID", CourseID);

parameters.put("SubmissionDate", SubmissionDate);

parameters.put("DaysMissedAverage", DaysMissedAverage);

parameters.put("ReportDate", ReportDate);

parameters.put("ReportingServletURL", ReportingServletURL);

 

try

{

Context ctx = new InitialContext();

if(ctx == null )

throw new Exception("No Context available...");

 

DataSource ds = (DataSource)ctx.lookup("java:comp/env/jdbc/Scholastic");

 

if (ds != null)

{

connection = ds.getConnection();

if(connection != null)

{ System.out.println("got connection");

//get the pre-compiled report

ServletContext context = this.getServletConfig().getServletContext();

 

InputStream inputStream = mvcs.CourseEvalReportProcessor.class.getResourceAsStream("/reports/CourseEvalReport.jasper");

 

if(inputStream == null)

{

System.out.println("unable to load report file");

return;

}

else

{

System.out.println("creating report...");

JasperPrint jasperPrint = null;

JasperReport jasperReport = (JasperReport)JRLoader.loadObject(inputStream);

System.out.println("got jasper report...");

//create JasperPrint using fillReport() method

jasperPrint = JasperFillManager.fillReport(jasperReport,

parameters,

connection);

System.out.println("got jasper print");

JRHtmlExporter exporter = new JRHtmlExporter();

 

//Send the report back out using PrintWriter object

Map imagesMap = new HashMap();

req.getSession().setAttribute("IMAGES_MAP", imagesMap);

 

exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);

exporter.setParameter(JRExporterParameter.OUTPUT_WRITER, out);

exporter.setParameter(JRHtmlExporterParameter.IMAGES_MAP, imagesMap);

exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, "image?image=");

exporter.exportReport();

System.out.println("the end");

}

}

}

}

catch (JRException e)

{

 

...

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