这可能是一个有用的答案。

在前端以pdf格式导出数据是否可以?

在此基础上，将内容处理添加为附件(默认)将下载该文件。如果您想查看它，您需要将其设置为内联。

我能很快想到的是，生成pdf并将其存储在webapp/downloads/< RANDOM-FILENAME>.pdf代码中，并使用HttpServletRequest发送一个转发到这个文件

request.getRequestDispatcher("/downloads/<RANDOM-FILENAME>.pdf").forward(request, response);

或者你可以这样配置你的视图解析器，

  <bean id="pdfViewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="viewClass"
              value="org.springframework.web.servlet.view.JstlView" />
    <property name="order" value=”2″/>
    <property name="prefix" value="/downloads/" />
    <property name="suffix" value=".pdf" />
  </bean>

然后返回

return "RANDOM-FILENAME";

我能够通过使用Spring的ResourceHttpMessageConverter中的内置支持来进行流处理。如果可以确定mime类型，这将设置内容长度和内容类型

@RequestMapping(value = "/files/{file_name}", method = RequestMethod.GET)
@ResponseBody
public FileSystemResource getFile(@PathVariable("file_name") String fileName) {
    return new FileSystemResource(myService.getFileFor(fileName)); 
}

@RequestMapping(value = "/files/{file_name}", method = RequestMethod.GET)
public void getFile(
    @PathVariable("file_name") String fileName, 
    HttpServletResponse response) {
    try {
      // get your file as InputStream
      InputStream is = ...;
      // copy it to response's OutputStream
      org.apache.commons.io.IOUtils.copy(is, response.getOutputStream());
      response.flushBuffer();
    } catch (IOException ex) {
      log.info("Error writing file to output stream. Filename was '{}'", fileName, ex);
      throw new RuntimeException("IOError writing file to output stream");
    }

}

一般来说，当你有response.getOutputStream()时，你可以在那里写任何东西。您可以将此输出流作为将生成的PDF放置到生成器的位置。另外，如果你知道你要发送什么文件类型，你可以设置

response.setContentType("application/pdf");

如下图所示

@RequestMapping(value = "/download", method = RequestMethod.GET)
public void getFile(HttpServletResponse response) {
    try {
        DefaultResourceLoader loader = new DefaultResourceLoader();
        InputStream is = loader.getResource("classpath:META-INF/resources/Accepted.pdf").getInputStream();
        IOUtils.copy(is, response.getOutputStream());
        response.setHeader("Content-Disposition", "attachment; filename=Accepted.pdf");
        response.flushBuffer();
    } catch (IOException ex) {
        throw new RuntimeException("IOError writing file to output stream");
    }
}

您可以在这里显示PDF或下载示例

这段代码可以在jsp上单击链接时自动从spring控制器下载文件。

@RequestMapping(value="/downloadLogFile")
public void getLogFile(HttpSession session,HttpServletResponse response) throws Exception {
    try {
        String filePathToBeServed = //complete file name with path;
        File fileToDownload = new File(filePathToBeServed);
        InputStream inputStream = new FileInputStream(fileToDownload);
        response.setContentType("application/force-download");
        response.setHeader("Content-Disposition", "attachment; filename="+fileName+".txt"); 
        IOUtils.copy(inputStream, response.getOutputStream());
        response.flushBuffer();
        inputStream.close();
    } catch (Exception e){
        LOGGER.debug("Request could not be completed at this moment. Please try again.");
        e.printStackTrace();
    }

}