从弹簧控制器下载文件 [英] Downloading a file from spring controllers
问题描述
我有一个要求,需要从网站下载 PDF.PDF 需要在代码中生成,我认为这将是 freemarker 和像 iText 这样的 PDF 生成框架的组合.有什么更好的办法吗?
I have a requirement where I need to download a PDF from the website. The PDF needs to be generated within the code, which I thought would be a combination of freemarker and a PDF generation framework like iText. Any better way?
但是,我的主要问题是如何允许用户通过 Spring Controller 下载文件?
However, my main problem is how do I allow the user to download a file through a Spring Controller?
推荐答案
@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 放入生成器的位置传递.此外,如果您知道要发送的文件类型,则可以设置
Generally speaking, when you have response.getOutputStream()
, you can write anything there. You can pass this output stream as a place to put generated PDF to your generator. Also, if you know what file type you are sending, you can set
response.setContentType("application/pdf");
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