Jasper Report PDF 打不开

Question

我正在尝试构建一个示例 Web 应用程序，它加载通过 jasper 报告（.jasper 文件）生成的 pdf 报告。但是，该报告不会以 pdf 格式打开并显示消息“此 PDF 文档可能无法正确显示”。代码片段如下。服务器日志中没有异常日志。任何帮助都会很棒。谢谢。

Servlet 控制器类

@WebServlet("/generateReport")

public class JasperReportsExample extends HttpServlet{

    final String deviceJasper = "SampleReport.jasper";

    protected void doGet(HttpServletRequest request, HttpServletResponse response)

            throws IOException, ServletException {

    response.setContentType("application/pdf");

    response.setCharacterEncoding("UTF-8");

    try{

    List<SampleReportBean> sampleReportBeanList = new ArrayList<SampleReportBean>();

    SampleReportBean bean = new SampleReportBean();

    bean.setName("Hello");

    sampleReportBeanList.add(bean);

    InputStream is = this.getClass().getClassLoader().getResourceAsStream(deviceJasper);

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

    JRBeanCollectionDataSource beanCollectionDataSource = new JRBeanCollectionDataSource(sampleReportBeanList);

    Map<String, Object> parameters = new HashMap<String, Object>();

    JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, beanCollectionDataSource);

    JasperExportManager.exportReportToPdfFile(jasperPrint, deviceJasper);

    }catch(Exception e) {

        System.out.println("Error:while creating jasper report....");

        e.printStackTrace();

    }

    }

}

html页面

<form action="/samplejasperreport/generateReport" method="get">

<div>

<input type="submit" name="Generate Report" value="Generate Report">

</div>

</form>

目录结构图

错误画面：

Answer 1

感谢 AlexK：JasperExportManager.exportReportToPdfStream(jasperPrint,&nbsp;response.getOutputStream());//send&nbsp;the&nbsp;pdfstream&nbsp;to&nbsp;the&nbsp;browser