grails - 如何在Jasper报告中导出PDF报告

Question

我想将报告导出为pdf，它应该询问用户下载位置。我该怎么做？

这是我的代码:

def exportToPdf(JasperPrint jasperPrint,String path,request){

    String cur_time =System.currentTimeMillis();
    JRExporter pdfExporter = null;

    pdfExporter = new JRPdfExporter();

    log.debug("exporting to file..."+JasperExportManager.exportReportToPdfFile(jasperPrint, "C:\\pdfReport"+cur_time+".pdf"));

    return ;
}

在Jasper Controller 中:

/**
   * Generate a html response.
   */
  def generateResponse = {reportDef ->
    if (!reportDef.fileFormat.inline && !reportDef.parameters._inline) {
      response.setHeader("Content-disposition", "attachment; filename=\"" + reportDef.name + "." + reportDef.fileFormat.extension + "\"");
      response.contentType = reportDef.fileFormat.mimeTyp
      response.characterEncoding = "UTF-8"
      response.outputStream << reportDef.contentStream.toByteArray()
    } else {
      render(text: reportDef.contentStream, contentType: reportDef.fileFormat.mimeTyp, encoding: reportDef.parameters.encoding ? reportDef.parameters.encoding : 'UTF-8');
    }
  }

Answer 1

您是否看过Jasper Plugin?似乎已经为您构建了工具。就询问用户下载位置而言，浏览器具有一些 Controller 来控制如何从网页接收文件。您要控制下载位置是您的真正问题吗？

[更新]

在服务器上使用位置“c:\”在客户端上是而不是，这就是为什么它不下载的原因。

尝试这样的事情...

def controllerMethod = {
    def temp_file = File.createTempFile("jasperReport",".pdf") //<-- you don't have to use a temp file but don't forget to delete them off the server at some point.

    JasperExportManager.exportReportToPdfFile(jasperPrint, temp_file.absolutePath));

    response.setContentType("application/pdf")  //<-- you'll have to handle this dynamically at some point
    response.setHeader("Content-disposition", "attachment;filename=${temp_file.getName()}")
    response.outputStream << temp_file.newInputStream() //<-- binary stream copy to client



}

我还没有测试过，还有更好的方法来处理文件和流，但是我想您会明白的。