Servlet pdf下载按钮创建 [英] Servlet pdf download button creation

问题描述

我想要一个servlet，当用户按下一个按钮时，它会生成一个动态pdf（根据用户给定的数据）并将其下载到用户的c：/ location。任何人都可以帮我怎么做？

I have a servlet where I want when a user press one button, it will generate a dynamic pdf (according to user given data) and download it to user's c:/ location. Can anybody help me how to do that ?

推荐答案

你到底有什么不清楚的？如何写一个HTML表单？如何从HttpServletRequest获取参数？或者如何生成pdf并下载到用户？

What exactly is unclear to you? How to write an html form? How to get parameters from HttpServletRequest? Or how to generate pdf and download to user?

<form action="yourServlet">
 <input type="text" name="sometxt"/>
 <input type="secret" name="passwd"/>
 <input type="submit"/>
</form>

然后，您可以在getXXX方法中检索它，例如

Then, you can retrieve it in your getXXX method like

final String text  = request.getParameter("sometxt");
final String rawPassword = request.getParameter("secret");

如果你需要渲染pdf，你应该看看Apache PdfBox。

If you need to render a pdf, you should look on Apache PdfBox.

最后，如果您在向用户下载文件时遇到问题：

And finally, if you in trouble with downloading file to user:

response.setContentType("application/pdf");
InputStream in = ... // depends where you store your file 
ServletOutputStream out = response.getOutputStream();
byte[] buffer = new byte[4096];
while(in.read(buffer, 0, 4096) != -1)
   out.write(buffer, 0, 4096);
in.close();
out.flush();
out.close();

并且不要忘记handilng IOException，我错过了简单的目的。

And don't forget about handilng IOException, which i missed in simpicity purposes.

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