jasperreport生成pdf_jasperreport 导出excel_jasperreport json(73)

Such parameter might be called OUT parameters.

For example, if you want your exporter to send the output it produces to an output stream, you will

supply the java.io.OutputStream object reference to the exporter using a parameter, probably

identified by the dori.jasper.engine.JRExporterParameter.OUTPUT_STREAM constant.

It is recommended to use the public constants of the

dori.jasper.engine.JRExporterParameter class to identify the parameters you set in your

exporters and only if you don't find one available for a particular setting you have to make in your

exporter, to extend this class to add new constants. This can be seen for the

dori.jasper.engine.export.JRXmlExporter, where special parameter identifier where created

by subclassing the dori.jasper.engine.JRExporterParameter class in the

dori.jasper.engine.export.JRXmlExporterParameter class.

You don't have to start from scratch when implementing the exporter intece, because there is a

convenience abstract class called dori.jasper.engine.JRAbstractExporter that at least deals

with parameter management for you.

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