Question

我有一个jasper报告，我把它放在与servlet相同的包中，我需要从中生成pdf文件，但是代码不起作用并且没有给出任何错误

public void print(String numBac , HttpServletRequest request,
  HttpServletResponse response) {
    try {          
        JasperDesign jasperDesign = JRXmlLoader
                .load("fiche.jrxml");
        String sql = "SELECT * FROM etudiant "
                + "INNER JOIN filiere ON etudiant.code_f=filiere.code_f "
                + "INNER JOIN lieu_nais ON etudiant.code_lieu=lieu_nais.code_lieu "
                + "INNER JOIN montant ON etudiant.code_m=montant.code_m WHERE bac='"
                + numBac + "'";
        JRDesignQuery newQuery = new JRDesignQuery();
        newQuery.setText(sql);
        jasperDesign.setQuery(newQuery);
        JasperReport report = JasperCompileManager
                .compileReport(jasperDesign);
        //JasperPrint print = JasperFillManager.fillReport(report, null, cnx);
        //JasperViewer.viewReport(print);

        byte[] byteStream;
        byteStream = JasperRunManager.runReportToPdf(report, null, cnx);
        OutputStream outStream = response.getOutputStream();
        response.setHeader("Content-Sisposition", "inline,filename="+DOWNLOAD_FILE_NAME);
        response.setContentType(FILE_TYPE);
        response.setContentLength(byteStream.length);
        outStream.write(byteStream, 0, byteStream.length);

    } catch (Exception e) {
        e.printStackTrace();
    }
}

即使我想生成jasper预览它也没有显示（注释中的代码）

Answer 1

什么是宝贝？你需要冲洗/关闭sos吗？ 您可以使用以下代码。这是使用java servlet的完整示例

请下载以下jar文件..
1. 的JasperReports-5.0.1.jar
2. 共享记录-1.1.2.jar
3. 公地消化器-2.1.jar
4. 公地集合-3.2.1-1.0.0.jar
5. 公地BeanUtils的-1.8.3.jar
6. Groovy的全2.1.3.jar
7. com.lowagie.text-2.1.7.jar
8. 您的数据库库

您可以使用

 @Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
     try {
        String path = "D:\\Software\\iReport-5.0.0-windows-installer\\u\\report4.jrxml";
        JasperReport jasReport = JasperCompileManager.compileReport(path);
        System.out.println("Jasper Report : " + jasReport);
        //Database connection 
        Connection con = /*Database Connection*/;
        System.out.println(con);

          //If You have any Paramert use bellow like
          Map paramMap = new HashMap();
         paramMap.put("id", request.getParameter("id"));

         //If You don't have parameter pass null instead of paramMap
        JasperPrint jasPrint = JasperFillManager.fillReport(jasReport, paramMap, con);
        System.out.println("Jasper Print : " + jasPrint);

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        ServletOutputStream sos = response.getOutputStream();
        response.setContentType("application/pdf");
        JasperExportManager.exportReportToPdfStream(jasPrint, sos);

    } catch (JRException ex) {
        Logger.getLogger(Tests.class.getName()).log(Level.SEVERE, null, ex);
    }
}

Answer 2

首先，这里有拼写错误：

response.setHeader("Content-Sisposition", "inline,filename="+DOWNLOAD_FILE_NAME);

它应该说“处置”而不是“Sisposition”：

response.setHeader("Content-Disposition", "inline,filename="+DOWNLOAD_FILE_NAME);

另外，请尝试使用“附件”而不是“内联”：

response.setHeader("Content-Disposition", "attachment,filename="+DOWNLOAD_FILE_NAME);

然后冲洗并关闭outStream：

outStream.flush();
outStream.close();

希望它有所帮助！

使用servlet java代码从jasper报告生成pdf文件

2 个答案: