Exporting Multiple Jasper Print Objects (XML)

[2006 IR Open Dicussion]

By: Chris - qoviachris

Exporting Multiple Jasper Print Objects (XML)

2006-02-21 14:28

I am trying to determine how to export multiple JRXML files into a single XML stream that can later be saved to PDF, etc..

 

Currently I am using:

 

JasperExportManager.exportReportToXmlStream(print, baos);

 

Is there a way to do this where "print" can be a List of JasperPrint Objects?

 

Any help would be appreciated.

Thanks in advance.

 

 

 

 

By: Aegis Thorne - aegisthorne

RE: Exporting Multiple Jasper Print Objects (

2006-02-21 17:19

Do you want to merge the reports into one big composite report ?

 

The following code creates a new empty report and copies all of the reports(JasperPrint objects) from the 'reports' List into it.

 

public JasperPrint getCombinedReport(List reports)

{

 

JasperPrint combinedReport = new JasperPrint();

 

//temp variable

JasperPrint print;

for(int i = 0; i < reports.size(); i++)

{

print = (JasperPrint) reports.get(i);

 

copyPages(combinedReport, print);

copyFonts(combinedReport, print);

}

copyProperties(combinedReport, print);

return combinedReport;

}

private void copyFonts(final JasperPrint combinedReport, JasperPrint

filledReport)

throws JRException

{

List fonts = filledReport.getFontsList();

 

if (fonts == null)

{

return;

}

 

for (Iterator iter = fonts.iterator(); iter.hasNext();)

{

JRReportFont font = (JRReportFont) iter.next();

if (!combinedReport.getFontsMap().containsKey(font.getName()))

{

combinedReport.addFont(font);

}

}

}

 

private void copyPages(final JasperPrint combinedReport, JasperPrint

filledReport)

{

List pages = filledReport.getPages();

 

if (pages == null)

{

return;

}

 

for (Iterator iter = pages.iterator(); iter.hasNext();)

{

JRPrintPage page = (JRPrintPage) iter.next();

combinedReport.addPage(page);

}

}

 

/** Set the properties of the target report to the properties of the

source. You might want to change this up.

*

* @param source

* @param target

*/

private void copyProperties(final JasperPrint target, JasperPrint

source)

{

target.setDefaultFont(source.getDefaultFont());

target.setName(source.getName());

target.setOrientation(source.getOrientation());

target.setPageHeight(source.getPageHeight());

target.setPageWidth(source.getPageWidth());

}

 

Hope this helps.

 

AT

 

 

 

 

By: Aegis Thorne - aegisthorne

RE: Exporting Multiple Jasper Print Objects (

2006-02-22 07:31

or you can export a list using:

 

"The JRExporterParameter.JASPER_PRINT_LIST can then be set on the JRPdfExporter (or whatever other exporter). If you put your two reports in a java.util.List and pass them as the value of the JRExporterParameter.JASPER_PRINT_LIST you are done. " - russelldb123

 

This is from the post on printing two reports at once. I haven't tried this method personally but it sounds simple enough.

 

 

 

 

 

By: Chris - qoviachris

RE: Exporting Multiple Jasper Print Objects (

2006-02-22 08:04

Can this be used in conjuntion with

 

JasperExportManager.exportReportToXmlStream(print, baos);

 

Currently I stream the reports to a byte array output stream and then we use them elsewhere and convert them as needed.

 

 

 

 

By: Aegis Thorne - aegisthorne

RE: Exporting Multiple Jasper Print Objects (

2006-02-22 08:08

Well, the JRPrint creation method will definately work, since the print is one object. The other method will also work with a few more lines of code.

 

JasperExportManager.exportReportToXmlStream(print, baos) is a convenience method for the following code:

JRXmlExporter exporter = new JRXmlExporter();

 

exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);

exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, outputStream);

 

exporter.exportReport();

 

So, set the JRExporterParameter.JASPER_PRINT_LIST instead of JASPER_PRINT and that should work.

 

 

 

 

By: Chris - qoviachris

RE: Exporting Multiple Jasper Print Objects (

2006-02-22 08:10

Awesome, thanks so much I will look into using this. I guess I just didn't realize that the JasperExportManager was a convience method.

 

 

 

 

By: Aegis Thorne - aegisthorne

RE: Exporting Multiple Jasper Print Objects (

2006-02-22 08:17

Good luck :)

 

 

 

 

By: Chris - qoviachris

RE: Exporting Multiple Jasper Print Objects (

2006-02-23 13:15

Just curious if someone knows ...

 

What I am trying to do is run the same JRXML file multiple times with the only difference being that the parameter map contains different values but the same keys.

 

From what I can see so far, it appears that Jasper uses the 1st instance of a property it finds.

 

I had been under the assumption that a JasperPrint object that had been filled could be merged with any number of JasperPrint Objects even if they contained identical data.

 

Basically what I am looking for is a way to merge multiple Jasper Print Objects into the same report where currently a single JasperPrint object represents a single page.

 

 

 

 

By: Aegis Thorne - aegisthorne

RE: Exporting Multiple Jasper Print Objects (

2006-02-23 13:24

I'm changing the datasource for each of my reports; the same keys are present. It works fine for me. Can you post some code ?

 

 

 

 

By: Chris - qoviachris

RE: Exporting Multiple Jasper Print Objects (

2006-02-23 13:32

This is the current code I am using:

 

private static InputStream createReport (final HashMap[] parameterMaps)

{

final ArrayList printList = new ArrayList ();

ByteArrayInputStream bais = null;

 

for (int mapIndex = 0; mapIndex < parameterMaps.length; mapIndex ++)

{

JasperReport report = null;

JasperPrint print = null;

final HashMap reportMap = parameterMaps[mapIndex];

 

try

{

final URL reportURL = ReportFactory.class.getResource((String) reportMap.get("reportURL"));

final Object obj = JRLoader.loadObject(reportURL);

 

if (obj instanceof JasperReport)

{

report = (JasperReport) obj;

}

}

catch (JRException jreEx) {}

 

if (report != null)

{

try

{

print = JasperFillManager.fillReport(report, reportMap, new JREmptyDataSource());

printList.add(print);

}

catch (JRException jreEx) {}

}

}

 

if (!printList.isEmpty())

{

try

{

final ByteArrayOutputStream baos = new ByteArrayOutputStream();

final JRXmlExporter exporter = new JRXmlExporter ();

 

exporter.setParameter(JRExporterParameter.JASPER_PRINT_LIST, printList);

exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, baos);

 

exporter.exportReport();

 

bais = new ByteArrayInputStream(baos.toByteArray());

}

catch (JRException jreEx) {}

}

 

return bais;

}