jasperreport生成pdf_jasperreport 导出excel_jasperreport json(72)

exporter classes that transform the generated documents into new output formats.

This way, if you need to export your reports into a special output format that is not yet available in the

core library, you might decide to implement yourself the dori.jasper.engine.JRExporter

intece.

The JasperReports Ultimate Guide

Page 69

Before deciding to implement this intece, it is important for you to understand how the

implementation is expected to function.

All the input data the exporter might need should be supplied to it using the so-called exporter

parameters, before the exporting process is started.

This is because the exporting process will be always invoked by calling the exportReport() method

of the dori.jasper.engine.JRExporter intece, and this method does not receive any

parameters itself, when called. The exporter parameters have to be already set using the

setParameter() method on the exporter instance you are working with, before launching the export

task.

You might choose to bulk set all your exporter parameters using the setParameters() method which

receives a java.util.Map object containing the parameter values. The keys in this map should be

instances of the dori.jasper.engine.JRExporterParameter class, as you would supply when

individually calling the setParameter() method for each of your exporter parameters.

Note that no matter what the type of output your exporter produces, you will be using parameters to

indicate to the exporter where to place or send this output.

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