如何将多个参数传递给报表并从Java导出到JasperReports中的PDF [英] How to pass multiple parameters to reports and export to PDF in JasperReports from Java

问题描述

我正在尝试使用Jasper Reports来帮助我的应用程序进行报告。我将不得不在HTML（JSP）中显示我的报告，并且还需要能够从我的网页中将报告导出为PDF。

我的大多数报告都需要多个参数，我可以'弄清楚如何从我的Servlet传递它们（如果我必须将它们传递给报告）。

I'm trying to use Jasper Reports to help with reporting in my application. I will have to display my reports in HTML (JSP) and would also need to be able to export the reports to PDF from within my web page.
Most of my reports require multiple parameters, and I can't figure out how to pass them from my Servlet (if I have to pass them there) to the report.

PS：我没有使用任何类型的框架，如果您可以建议一个免费的框架实现，那将会很棒。

P.S: I'm not using frameworks of any sort, it would be great if you could suggest a framework free implementation.

推荐答案

//Preparing data - change this as per your requirement
List<DataDTO> dataDTOList = new ArrayList<DataDTO>();
DataDTO dataDTO = new DataDTO; 
dataDTO.setFirstName("FirstName"); // in your Jasper field name is 'firstName' as type String
dataDTO.setLastName("LastName"); // in your Jasper field name is 'lastName' as type String
dataDTOList.add(dataDTO);

// Adding data
JRDataSource jrdatasource = new JRBeanCollectionDataSource(dataDTOList);

// Exporting report
File jasperFile = new File("C:/YourReport.jasper"); // change this
JasperReport jasperReport = (JasperReport) JRLoader.loadObject(new FileInputStream(jasperFile.getAbsolutePath()));             
Map parameters = new HashMap();
JRConcurrentSwapFile jrSwapFile = new JRConcurrentSwapFile("C:/PDFOutput/"),30,2);
JRSwapFileVirtualizer virtualizer = new JRSwapFileVirtualizer(2,jrSwapFile,true);
parameters.put(JRParameter.REPORT_VIRTUALIZER, virtualizer);
JasperPrint jpPrintObj = JasperFillManager.fillReport(jasperReport,parameters,jrdatasource);
JasperExportManager.exportReportToPdfFile(jpPrintObj,"C:/PDFOutput/");`

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