使用 Java 和 Jasper 生成 Excel 文件

Question

我不确定问题是什么，但我正在使用Java和Jasper生成一个excel文件 正确地，我想立即将文件以xlsx格式下载到客户端站点，但该文件正在以.xhtml扩展名下载。我需要做什么？我正在使用 JSF。

这是我的方法：

public void generateOutStandingDCReportXLS() {
        Connection conn = null;
        try {
            conn = db.getDbConnection();
            Map parameters = new HashMap();
            ClassLoader classLoader = getClass().getClassLoader();
            InputStream logourl = classLoader.getResourceAsStream("/com/bi/jrxml/simba_logo.jpg");
            InputStream stainurl = classLoader.getResourceAsStream("/com/bi/jrxml/coffee_stain.png");
            parameters.put("logo", logourl);
            parameters.put("stain", stainurl);
            InputStream url = classLoader.getResourceAsStream("/com/bi/jrxml/Outstanding_DC.jrxml");
            JasperReport jasperReport = JasperCompileManager.compileReport(url);
            JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, conn);
            ServletContext ctx = (ServletContext) FacesContext.getCurrentInstance().getExternalContext().getContext();
            String path = (String) ctx.getAttribute("reportdir");
            File f = new File(path);
            if (!f.exists()) {
                f.mkdirs();
            }
            String reportDestination = f.getAbsolutePath() + "/OutStanding_DC_Report" + ".xlsx";  //This is generated Correctly
            File xlsFile = new File(reportDestination);
            JRXlsxExporter Xlsxexporter = new JRXlsxExporter();
            Xlsxexporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
            Xlsxexporter.setParameter(JRExporterParameter.OUTPUT_FILE, xlsFile);
            Xlsxexporter.exportReport();//File is generated Correctly
            FileInputStream fis = new FileInputStream(new File(reportDestination));
            HttpServletResponse response = (HttpServletResponse) FacesContext.getCurrentInstance().getExternalContext().getResponse();
            IOUtils.copy(fis, response.getOutputStream());
            response.setContentType("application/vnd.ms-excel");
            response.setHeader("Content-Disposition", "attachment; filename=" + "OutStanding_DC_Report" + ".xlsx"); //This is downloaded as .xhtml
            response.flushBuffer();
            fis.close();
        } catch (JRException asd) {
            System.out.println(asd.getMessage());
        } catch (IOException asd) {
            System.out.println(asd.getMessage());
        } finally {
            try {
                if (conn != null) {
                    conn.close();
                }
            } catch (SQLException asd) {
                System.out.println(asd.getMessage());
            }
        }
    }

服务器端的文件具有正确的扩展名，但要下载的文件具有.xhtml扩展名。

Answer 1

在IOUtils.copy()之前调用setContentType()和setHeader()。

调用response.getOutputStream()后，将发送标头。

Answer 2

斯坦利，你仍然面临同样的问题吗？ 如果是，请尝试在下面设置字符串

response.setContentType() 
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet 

即

response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");

而不是

application/vnd.ms-excel i.e. response.setContentType("application/vnd.ms-excel");

希望这会有所帮助。