碧玉报告动态子报告生成 [英] jasper-reports dynamic sub report generation

问题描述

我正在尝试使用jasper-reports(不使用iReport)从Java代码生成报告.

I'm trying to generate a report from java code with jasper-reports (without iReport).

已成功创建以下元素:

• 名为 reportDesign
的主报表对象(类:JasperDesign)
• 名为 subReportDesign
的子报表对象(类:JasperDesign) 主报表中名为 subReportElement 的
• SubReport元素(类:JRDesignSubreport)
• 已编译的名为 subReport
的子报表(类:JasperDesign)

• Master report object (class: JasperDesign) named reportDesign
• Sub report object (class: JasperDesign) named subReportDesign
• SubReport element (class: JRDesignSubreport) in the Master report named subReportElement
• Compiled Sub report (class: JasperDesign) named subReport

问题是，如何从 subReportElement 中引用 subReportDesign 对象?

The problem is, how do I reference the subReportDesign object from the subReportElement?

到目前为止，我发现的唯一方法是将 subReportElement 的表达式"字段设置为$P{REPORT_PARAMETERS_MAP}.get("subreportobject")，然后将 subReport 进入编译过程中的 reportDesign .

So far the only way I found, was to set subReportElement's "expression" field to $P{REPORT_PARAMETERS_MAP}.get("subreportobject"), and to put subReport into reportDesign during the compilation.

还有另一种方法吗?例如，我可以在编译主报告之前使用变量-以某种方式..-

Is there another way? For example can I use variables - in some way .. - before compiling the Master report?

谢谢， 克里斯蒂

推荐答案

如果子报表XML文件不在已知位置，则报表参数映射是唯一的方法.它确实需要我发现的临时文件，但这是几年前的事了.我进行了类似的设置(JRXML在数据库中).对于每个子报表，在编译主报告之前我都必须这样做:

If the subreport XML files are not in a known location, the report parameters map is the only way to do it. It does require temp files from what I found, but this was a couple of years ago. I've made a similar set up (JRXML is in a database). For each subreport I had to do this prior to compiling the master report:

 byte[] bytes = subreportXMLString.getBytes("UTF-8");
 InputStream input = new ByteArrayInputStream(bytes);

 File compiledReportFile = File.createTempFile(subreportParameterName, ".jasper");
 FileOutputStream buffer = new FileOutputStream(compiledReportFile);
 JasperCompileManager.compileReportToStream(input, buffer);
 input.close();
 buffer.close();
 reportParameters.put(subreportParameterName, compiledReportFile);

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