当路径指向JAR文件内时，将SUBREPORT_DIR传递给子报告[Jasper Reports 4.5] [英] Passing SUBREPORT_DIR to subreport when the path points inside a JAR file [Jasper Reports 4.5]

问题描述

我在将 SUBREPORT_DIR 路径传递到子报表时遇到问题。报告实际上位于同一文件夹中，但位于JAR文件中。我尝试过这样的事情（可能不准确）：

I'm having problems passing the SUBREPORT_DIR path to my subreport. The reports are actually in the same folder, but inside a JAR file. I've tried something like this (might be inaccurate):

parameterList = new HashMap<String, Object>();

URL mainReport = this.getClass().getResource("mainReport.jasper");
String mainReportPath = mainReport.getPath();
String subreportDir = mainReportPath.substring(0, mainReportPath.lastIndexOf("/")+1);

parameterList.put("SUBREPORT_DIR", subreportDir);

此路径指向JAR文件，但我得到 net.sf。 jasperreports.engine.JRException：在报告生成时找不到资源：... 。我怎样才能做到这一点？

This path points inside the JAR file, but I get net.sf.jasperreports.engine.JRException: Resource not found at : ... upon report generation. How can I make this work?

编辑：

我试图定义我的子报告没有 SUBREPORT_DIR ，但没有运气：

I tried to define my subreport without the SUBREPORT_DIR, but no luck:

<subreport>
      <reportElement x="0" y="32" width="475" height="17"/>
      <dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($F{current})]]></dataSourceExpression>
      <subreportExpression><![CDATA["mysubreport.jrxml"]]></subreportExpression>
</subreport>

推荐答案

我的主要问题是，我使用的是自定义JAR装载机，Jasper不知道。好消息是，也可以将子报表作为 java.net.URL 或 java.io.InputStream 传递：

My main problem was, that I was using a custom JAR loader, which Jasper didn't know of. The good news is it is also possible to pass a subreport as java.net.URL or java.io.InputStream:

Java代码：

InputStream subInputStream = this.getClass().getResourceAsStream("sub.jasper");
parameterList.put("SUBREPORT_INPUT_STREAM", subInputStream);

JRXML：

<subreportExpression class="java.io.InputStream"><![CDATA[$P{SUBREPORT_INPUT_STREAM}]]></subreportExpression>

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