how to pass jasper file path to subreport of subre

问题:

I am using iReport tool in conjunction with JasperReports 1.3.4.

I have a master report, which contain two subreports. One of these subreports has an embedded subreport. All of the .jasper files reside in the same directory.

iReport generated the parameter called SUBREPORT_DIR. The subreportExpression expresses the subreport filename as ![CDATA[$P{SUBREPORT_DIR} + "subreport.jasper"].

Everything works great when the report is generated from within iReport. But, I have a small Java web appplication that I am trying to use to generate reports. I pass a "SUBREPORT_DIR" parameter to JasperFillManager.fillReport(String sourceFileName, Map parameters, JRBeanCollectionDatasource). This SUBREPORT_DIR is set to the directory in which the master report is located.

fillReport throws an exception:

 net.sf.jasperreports.engine.JRException: Could not load object from location :
    .sub-subreport.jasper.

It appears that the first subreport is trying to process its subreport(embedded subreport), but the SUBREPORT_DIR is not being resolved, or used properly to generate the name of the sub-subreport.

Is there something I'm missing? How should this scenario be handled?

回答1:

Click in Subreport1, go to the properties tab -> Subreport properties -> Parameters

You will pass your 'MasterReport' SUBREPORT_DIR parameter as a parameter to 'Subreport1'. Create this entry:

Name: SUBREPORT_DIR Expression: $P{SUBREPORT_DIR}

Don't forget to recompile your reports and make sure to republish your web app in the application server.

回答2:

I had the same issue and setting the SUBREPORT_DIR to the full package name containing my reports worked.

For example:

"com/mycomp/myapp/reports/"

Our set ups are similar in that you have all reports in the same directory. The difference is I am running my app from the desktop (Java SE). However, my reports were located in a jar file. When I tried to set teh SUBREPORT_DIR to c:\path\to\app\myapp.jar!\com\mycomp\myapp\reports Jasper failed to locate the file.

Hope this helps.

回答3:

As Marcio already explained, your SUBREPORT_DIR parameter has to be passed from the calling report to the subreport. Using relative path with .or ./ is not reliable, an absolute path is always to prefer.

So you have to write in your jrxml file:

<subreport isUsingCache="false">
    <subreportParameter name="SUBREPORT_DIR">
        <subreportParameterExpression><![CDATA[$P{SUBREPORT_DIR}]]></subreportParameterExpression>
    </subreportParameter>
    <subreportExpression class="java.lang.String"><![CDATA[$P{SUBREPORT_DIR} + "mySubreport.jasper"]]></subreportExpression>
</subreport>

You have to pass the subreportParameterExpression with the $P{SUBREPORT_DIR}, elswise it won't pass the parameters (only setting <subreportParameter name="SUBREPORT_DIR"/> is not enough).

回答4:

just set $P{SUBREPORT_DIR} as prompt and pass your value(the path to the directory may not be valid like c:\something.jasper instead of c:\\something.jasper)