从java生成带有子报告的Jasper报告
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Generate Jasper report with subreport from java
提问by kandarp
I know how to generate jasper report without any subreport. But currently I have a subreport in my report and I would like to know how can I compile that subreport in java?
我知道如何在没有任何子报告的情况下生成 jasper 报告。但是目前我的报告中有一个子报告，我想知道如何在 Java 中编译该子报告？
采纳答案by Alex K
You can compile the subreport like the simple report - with help of JasperCompileManager.compileReport(java.lang.String sourceFileName)method, for example.
您可以像简单的报告一样编译子报告 - 例如，在JasperCompileManager.compileReport(java.lang.String sourceFileName)方法的帮助下。
After that you can pass the compiled subreport as parameter to the master report.
之后，您可以将编译后的子报表作为参数传递给主报表。
The sample:
样品：
JasperReport jasperMasterReport = JasperCompileManager.compileReport(masterReportSource);
JasperReport jasperSubReport = JasperCompileManager.compileReport(subReportSource);
Map<String, Object> parameters = new HashMap()<String, Object>;
parameters.put("subreportParameter", jasperSubReport);
JasperFillManager.fillReportToFile(jasperMasterReport, parameters, outputFileName, connection);
The snippet from the master report's jrxml file (sample):
主报告的 jrxml 文件（示例）中的片段：
<parameter name="subreportParameter" class="net.sf.jasperreports.engine.JasperReport"/>
...
<detail>
<band height="50">
...
<subreport>
<reportElement isPrintRepeatedValues="false" x="5" y="25" width="325" height="20" isRemoveLineWhenBlank="true" backcolor="#ffcc99"/>
<subreportParameter name="City">
<subreportParameterExpression><![CDATA[$F{City}]]></subreportParameterExpression>
</subreportParameter>
<connectionExpression><![CDATA[$P{REPORT_CONNECTION}]]></connectionExpression>
<returnValue subreportVariable="PriceSum" toVariable="ProductTotalPrice" calculation="Sum"/>
<subreportExpression class="net.sf.jasperreports.engine.JasperReport"><![CDATA[$P{subreportParameter}]]></subreportExpression>
</subreport>
Notes
笔记
I mentioned an old API for generating result: JasperFillManager.fillReportToFile(JasperReport, String, Map, java.sql.Connection)
我提到了一个用于生成结果的旧 API： JasperFillManager.fillReportToFile(JasperReport, String, Map, java.sql.Connection)
In case using JasperReports 6.xit is better to use exporters (concrete implementation of net.sf.jasperreports.export.Exporterinterface, for example JRPdfExporter) for generating output file
如果使用JasperReports 6.x，最好使用导出器（net.sf.jasperreports.export.Exporter接口的具体实现，例如JRpdfExporter）来生成输出文件
The example how to use Exporter right can be found here
可以在此处找到如何使用 Exporter 权限的示例
