将文件 Jrxml 转换为 FileOutputStream 并在 HTML 页面中显示

Question

我有一个文件 jrxml（使用 Jasper Report 创建），我想在 HTML 页面中显示它而不使用例如 pdf 文件。我想在服务器端进行这种转换 (spring)。

我从页面 HTML 调用 java 方法使用：

<FORM NAME="formTicket" ACTION='http://localhost:8080/movies/ticket' METHOD="GET">

在 java 我有：

@RequestMapping(value = "/movies/ticket", method = RequestMethod.GET)//stampa ticket
public Document add(@RequestParam(value="id")int id, int numb) {//numb=numeroBigliettiDaStampare,Id=specificoMovie
    String xmlFile = serv.getPDF(id, numb);
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder;
    try{
        builder = factory.newDocumentBuilder();
        Document doc = builder.parse(new InputSource(new StringReader(xmlFile)));
        return doc;
    }catch(Exception e){
        e.printStackTrace();
    }
    return null;
}

和 getPDF 方法，与 JasperReports:

public String getPDF(int id, int number){
    String fileJrxml = "/home/salvador/workspace/serverMovies/src/main/webapp/resources/Jasper/ticket.jrxml";
    File jasperFileSource = new File(fileJrxml);
    //Log.debug("Crando il PDF");
      try
      {
          ArrayList<Movie> film=new ArrayList<Movie>();
         // film.add(moviedao.getMovie(id));
          Movie f; 
          int posto=1;
          int fila=1;
          for(int i=0; i<number; i++){
              f = new Movie(moviedao.getMovie(id).getTitle(),moviedao.getMovie(id).getActor(),moviedao.getMovie(id).getGenre(),moviedao.getMovie(id).getYear(),moviedao.getMovie(id).getLanguage());
              f.setDurata("80m");
              posto = posto +1;
              fila = fila +1;
              f.setPosto(posto+"");
              f.setFila(fila+"");
              f.setPrezzo("8.50");
              film.add(f);
          }


        JasperDesign jasperDesign = JRXmlLoader.load(jasperFileSource);

        JasperReport jasperReport = JasperCompileManager.compileReport(jasperDesign);

        JRBeanCollectionDataSource jrDataSource = new JRBeanCollectionDataSource(film);

        JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, null, jrDataSource);

        String xmlStr = JasperExportManager.exportReportToXml(jasperPrint);

        //JasperExportManager.exportReportToPdfFile(jasperPrint, "/home/salvador/workspace/serverMovies/src/main/webapp/resources/ticket.pdf");

        //Log.debug("PDF creato");
        //System.out.println("Pdf file successfully generated.");

        return xmlStr;

      }//try
      catch (JRException e)
      {
        System.out.println("Error during the generation of PDF file.\n");
        e.printStackTrace();
      } //catch
      return "errore";
}//getPDF

我找到了这个问题的解决方案，这是我的控制器：

@RequestMapping(value = "/movies/ticket", method = RequestMethod.GET)//stampa ticket
public void getTicket(@RequestParam(value="id")int id, int numb, HttpServletResponse response) throws Exception {//numb=numeroBigliettiDaStampare,Id=specificoMovie
    byte[] xmlFile = serv.getPDF(id, numb);
    serv.streamReport(response, xmlFile, "report.pdf");
}//add

调用两个方法，第一个是从 JasperReport 创建一个字节流：

public byte[] getPDF(int id, int number){
    String fileJrxml = "/home/salvador/workspace/serverMovies/src/main/webapp/resources/Jasper/ticket.jrxml";
    File jasperFileSource = new File(fileJrxml);
    //Log.debug("Crando il PDF");
      try
      {
          ArrayList<Movie> film=new ArrayList<Movie>();
         // film.add(moviedao.getMovie(id));
          Movie f; 
          int posto=1;
          int fila=1;
          for(int i=0; i<number; i++){
              f = new Movie(moviedao.getMovie(id).getTitle(),moviedao.getMovie(id).getActor(),moviedao.getMovie(id).getGenre(),moviedao.getMovie(id).getYear(),moviedao.getMovie(id).getLanguage());
              f.setDurata("80m");
              posto = posto +1;
              fila = fila +1;
              f.setPosto(posto+"");
              f.setFila(fila+"");
              f.setPrezzo("8.50");
              film.add(f);
          }//for i


        JasperDesign jasperDesign = JRXmlLoader.load(jasperFileSource);

        JasperReport jasperReport = JasperCompileManager.compileReport(jasperDesign);

        JRBeanCollectionDataSource jrDataSource = new JRBeanCollectionDataSource(film);

        JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, null, jrDataSource);

        byte[] data= JasperExportManager.exportReportToPdf(jasperPrint);

        return data;

      }//try
      catch (JRException e)
      {
        System.out.println("Error during the generation of PDF file.\n");
        e.printStackTrace();
      } //catch
      return null;
}//getPDF

第二个我使用流在浏览器中显示我的 JasperReport：

public void streamReport(HttpServletResponse response, byte[] data, String name) throws IOException
{
    response.setContentType("application/pdf");
    response.setHeader("Content-disposition", "attachment; filename=" + name);
    response.setContentLength(data.length);
    response.getOutputStream().write(data);
    response.getOutputStream().flush();
}// streamReport

Answer 1

您可以使用 JasperExportManager.exportReportToHtmlFile(jasperPrint, destFileName) 创建 HTML

Answer 2

简单的方法：

JasperExportManager.exportReportToPdfStream(jasperPrint, outputStream);

最可配置：

JRPdfExporter exporter = new JRPdfExporter();             
exporter.setExporterInput(SimpleExporterInput.getInstance(jasperPrint));
exporter.setExporterOutput(new SimpleOutputStreamExporterOutput(outputStream));

SimplePdfExporterConfiguration configuration = new SimplePdfExporterConfiguration();
//configuration.setConfigurations....;
exporter.setConfiguration(configuration);
exporter.exportReport();

有关如何在 Spring 上下文中直接流式传输到浏览器，请参阅

Stream directly to response output stream in handler method of Spring MVC 3.1 controller

writer 是您传递的 outputStream

不要忘记在您的回复中添加 header

"Content-disposition", "filename=report.pdf" , 显示在第

页

"Content-disposition", "attachment; filename=report.pdf"，下载吧

编辑：我看到你自己回答了问题，为了改进你的代码考虑你不需要每次都编译jrxml。

@RequestMapping(value = "/movies/ticket", method = RequestMethod.GET)//stampa ticket
public void getTicket(@RequestParam(value="id")int id, int numb, HttpServletResponse response) throws Exception {
    //Use the complied file,you do not need to compile the jrxml everytime
    //Furthermore since its in src (I would have use class loader)
    String fileJasper = "/home/salvador/workspace/serverMovies/src/main/webapp/resources/Jasper/ticket.jasper";
    JasperReport report = (JasperReport)JRLoader.loadObject(fileJasper);
    JasperPrint jasperPrint = JasperFillManager.fillReport(report, null, getDataSource(id));
    response.setContentType("application/pdf");
    response.setHeader("Content-disposition", "attachment; filename=report.pdf");
    JasperExportManager.exportReportToPdfStream(jasperPrint, response);
}

将文件 Jrxml 转换为 FileOutputStream 并在 HTML 页面中显示

Convert a file Jrxml to FileOutputStream and show it in an HTML page

java

spring

pdf

jasper-reports

outputstream