最近项目经理安排任务学习jasperreport报表的设计与制作，根据提供的资料以及在网上的学习，自己实现了一个可以通过外部传入数据下载excel的报表，
因为还在初学阶段，数据源暂时是在程序中传入，还没通过数据库或者javabean传入，接下来的时间里慢慢深入。
首先是在IReport软件里设计好自己的报表图，我设计了一个很简单的报表，其实报表设计最重要的是其核心的几个过程

设计报表，数据导入，输出报表

第一个程序是service里的下载代码

@Service("reportService")
@Path("/report")
public class ReportService {
	@Autowired
	private ICommonDao dao;
	
	@Path("download")
	@Produces(MediaType.TEXT_PLAIN)
	@Transactional
	public String downloadReport(@Context HttpServletRequest req , @Context HttpServletResponse res) throws Exception{
		String designFilePath = req.getSession().getServletContext().getRealPath("/jasper") + 
				File.separator + "reportTest.jrxml";
		File designFile = new File(designFilePath);
		
		if(designFile.exists()){
			DataReportProcess reportProcess = new DataReportProcess();
			reportProcess.process(req, res, designFile);
			
		}
		return "success";
	}
}

这段代码里涉及DataReportProcess类

public class DataReportProcess extends XLSReportProcess{
	
	/**
	 *从模板文件编译获得jasperReport对象
	 *@return JasperReport对象 jasperReport
	 * @throws JRException 
	 */
	private JasperReport getJasperReport(File designFile) throws Exception{
		JasperReport jasperReport = null;
		JasperDesign design = JRXmlLoader.load(designFile);
		jasperReport = JasperCompileManager.compileReport(design);
		return jasperReport;
	}
	
	public void process(HttpServletRequest req , HttpServletResponse res, File designFile) throws Exception{
		String outputFileName = "dataReport.xlsx";
		Map<String, Object> dataMap = new HashMap<String, Object>();
		dataMap.put("name", "张三");
		Collection<Map<String, ?>> dataMapList = new ArrayList<Map<String,?>>();
		dataMapList.add(dataMap);
		JRMapCollectionDataSource dataSource = new JRMapCollectionDataSource(dataMapList);
		
		JasperReport jasperReport = this.getJasperReport(designFile);
		JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport,null,dataSource);
		this.exportWebReport(ReportProcess.Type.xlsx, res, jasperPrint , outputFileName);
	}
}