java下载pdf实现打印功能

1.使用TIBCO Jaspersoft Studio-6.16.0对模板进行编辑

2.生成jsaper文件，放入到项目的resources文件夹下

 3.jar包引入

 <dependency>
     <groupId>net.sf.jasperreports</groupId>
     <artifactId>jasperreports</artifactId>
     <version>6.17.0</version>
</dependency>
<dependency>
     <groupId>net.sf.jasperreports</groupId>
     <artifactId>jasperreports-fonts</artifactId>
     <version>6.19.1</version>
</dependency>
<dependency>
     <groupId>net.sourceforge.jexcelapi</groupId>
     <artifactId>jxl</artifactId>
     <version>2.6.12</version>
</dependency>      

4.代码实现：注意返回的map中的key值要跟模板中定义的变量的key值保持一致

  @PostMapping("/printPdf")
    public void printPdf(Long id,HttpServletResponse response) throws IOException {
        List<Map> list = dwdHrLeavemessageService.selectprintInfo(id);
        ReportUtil.previewReport(list, "report/请假单",response);
    }

public static void previewReport(List result, String reportId,HttpServletResponse response) {
		JRMapArrayDataSource jrds = new JRMapArrayDataSource(result.toArray());
		ClassPathResource resource = new ClassPathResource(reportId + ".jasper");
		InputStream in = null;
		OutputStream outputStream = null;
		try {
			in = resource.getInputStream();
			outputStream = response.getOutputStream();
		} catch (IOException e) {
			e.printStackTrace();
		}
		JasperReport jasperReport;
		JasperPrint jasperPrint;
		try {
			jasperReport = (JasperReport) JRLoader.loadObject(in);
			jasperPrint = JasperFillManager.fillReport(jasperReport, null, jrds);
			response.setContentType("application/pdf");
			response.setHeader("Content-Disposition", "inline;");
			JasperExportManager.exportReportToPdfStream(jasperPrint, outputStream);
		} catch (JRException e) {
			e.printStackTrace();
		}
		try {
			in.close();
			outputStream.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}