JasperReports: How to call the report in jsp page

问题

I made one jasper report using iReport 3.7.4 version, now i have to use that or call that report in my java application where i am using servlets, jsp and struts framework, apache tomcat as server.

I want steps regarding how to call the jasper report with some example.

回答1:

Compile the report in iReport
Place the compiled report on the classpath

load it with

JasperReport jasperReport = (JasperReport) JRLoader.loadObject(inputStream);

Fill it with data. dataSource is the DataSource instance you have - for example a BeanCollectionDataSource
```
JasperPrint jasperPrint = 
     JasperFillManager.fillReport(jasperReport, params, dataSource);
```

Export it

JRPdfExporter exporter = new JRPdfExporter();
exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, outputStream);
exporter.exportReport();

The outputStream above may be either a response.getOutputStream() or a FileOutputStream(), depending on whether you want to send it to a client or you want to store it as a file. If you want to send it to the client, you'd have to send the Content-Disposition header, and some more, but that depends on the format you want to save to. In case you want to print on the client, it's quite a different question - you'd need some client-side code, an applet, for example.

回答2:

After 6 years @Bozho answer now (v5 and v6) contains deprecated code on point 5 JRExporterParameter.OUTPUT_STREAM, but I will try to improve the other points while I'm at it

Load the report

compiled version .jasper

JasperReport jasperReport = (JasperReport) JRLoader.loadObject(inputStream);

or the non compiled version .jrxml (slower since need to compile but feasible)

JasperReport jasperReport = JasperCompileManager.compileReport("path/to/myReport.jrxml");

Fill the report

with nothing (datasource generated inside report or just static text)

JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, params);

with datasource:

JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, params, dataSource);

with database connection (may the most common, sql executed inside report)

JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, params, connection);

Export report

JRPdfExporter exporter = new JRPdfExporter()
exporter.setExporterInput(new SimpleExporterInput(jasperPrint));
exporter.setExporterOutput(new SimpleOutputStreamExporterOutput(outputStream));
SimplePdfExporterConfiguration configuration = new SimplePdfExporterConfiguration();
configuration.setMetadataAuthor("Petter"); //Set your pdf configurations, 
exporter.setConfiguration(configuration);
exporter.exportReport();

If you like to stream the report directly to web page this is how contentType and Content-disposition is set and how you retrieve the outputStream

response.setContentType("application/x-pdf");
response.setHeader("Content-disposition", "inline; filename=myReport.pdf");
OutputStream outputStream = response.getOutputStream();

回答3:

This piece of code should give you some idea on how to do it

JasperReport jr=JasperCompileManager.compileReport("yourJRXMLFilePath");
JasperPrint jrPrint = JasperFillManager.fillReport(jr,mapWithParameters,aJRDataSource);
JasperExportManager.chooseYourFavoriteMethod(jrPrint,"destinationFile");

Otherwise, check the api The first line can be ommited if you had already compiled the file with iReport. Check the api for the correct method on JasperFillManager in this case.

回答4:

in the first answer, point 5: After

JRPdfExporter exporter= new JRPdfExporter();

add

exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);

回答5:

Best solution (For better performance as well), will be calling a compiled report.

you can see the example below

import java.io.IOException;
import java.util.HashMap;

import net.sf.jasperreports.engine.JREmptyDataSource;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperExportManager;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;

public class PdfFromJasperFile {
  public static void main(String[] args) throws JRException, IOException {

    JasperPrint jasperPrint = JasperFillManager.fillReport("report.jasper",  new HashMap<String, Object>(), 
    new JREmptyDataSource());
    JasperExportManager.exportReportToPdfFile(jasperPrint, "sample.pdf");

  }
}

回答6:

This is a different way of doing the same.

    JasperReport jasperReport;
    JasperPrint jasperPrint;
    Map<String, Object> param = new HashMap<String, Object>();
    try{
        String sourceFileName = ".jrxml";
        jasperReport = JasperCompileManager.compileReport(sourceFileName);
        jasperPrint = JasperFillManager.fillReport(jasperReport,param,new JRBeanCollectionDataSource(getDetails()));
        JasperExportManager.exportReportToPdfFile(jasperPrint, ".pdf");
    }
    catch(Exception e){
    }

来源：https://stackoverflow.com/questions/3746649/jasperreports-how-to-call-the-report-in-jsp-page