Calling Java Methods From Jasper Reports

To call java methods from jasper reports. Just Follow the following steps

Step1:

create a java class with a static method which return something i.e either String or Integer.. etc

Step2:

Create a jar file by the following command 

jar - cvf file.jar packagename

Step3:

set it as class path as 

Tools > Options > ClassPath > Add Jar > Ok

Step4: 

Create a Static field. Edit its Expression by EditExpression to  "new packagename.classname().methodname(parameter) "

Step5:

Place this static field wherever you want

jasper reports- creating and compiling basic jasper report without any data from jsp or servlets

I have designed a report in ireport of jasper report .To compile and execute that report we have to place the following jar files into lib folder of our WEB-INF folder

Jar file Names:

1. commons-collections-3.2.1.jar

2. commons-beanutils-1.8.2.jar

3. commons-digester.1.7.jar

4. jasperreports-4.5.0.jar

5. commons-logging-1.1.1.jar

6. itext2.1.7.jar

7. asm-3.3.jar

8. antlworks-1.4.3.jar

9. servlet-api.jar

10. groovy-all-1.7.jar

These are the common jar files required.

Write a Servlet  that generates PDF report from out compiled jasper report. The servlet code of a demo servlet is shown below . Please ffollow the code....

code: 

 HashMap hm = null;

    

      String jrxmlFileName = getServletContext().getRealPath("\\jrxml")+"\\demoreport.jrxml";

     

   String jasperFileName =getServletContext().getRealPath("\\jrxml")+"\\demoreport.jasper";

   String pdfFileName = getServletContext().getRealPath("\\jrxml")+"\\demoreport.pdf";

    JasperCompileManager.compileReportToFile(jrxmlFileName,jasperFileName);

    hm = new HashMap();

   hm.put("ID", "123");

   hm.put("DATENAME", "April 2006");

   

    JasperPrint jasperPrint = (JasperPrint) JasperFillManager.fillReport(jasperFileName,hm, new JREmptyDataSource());

    JasperExportManager.exportReportToPdfFile(jasperPrint, pdfFileName);

   

    System.out.println("report generated...");

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The Above code generates required PDF report from jasper report into a folder where jasper report files are kept...