如何使用Java将pdf链接为文件

Question

Is there a way in Java/.jsp to set the content type, etc... so that a link to a pdf prompts the user to save it rather than opening it in the same or different window in the browser? I've seen some examples of how to do this in PHP, but not Java.

Not sure if compiled vs. interpreted languages could have anything to do with why I can't find a Java solution. (Random thought)

Answer 1

You need to set the Content-Type and Content-Disposition headers. Assuming response is an HttpServletResponse object,

String filename = "foo.pdf";

response.setHeader("Content-Type", "application/pdf");
response.setHeader("Content-Disposition", "attachment;filename=\"" + filename + "\"");

More info: The BalusC Code: FileServlet .

Answer 2

If the PDF is not autogenerated or read from an external location by a servlet, but just present in the public webcontent, then it suffices to map a Filter on an URL pattern of *.pdf (or whatever more specific/generic) which does the following job in the doFilter() method.

HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse res = (HttpServletResponse) response;
String filename = req.getRequestURI().substring(req.getRequestURI().lastIndexOf('/') + 1);
res.setHeader("Content-Disposition", "attachment;filename=\"" + filename + "\"");
chain.doFilter(request, response);

Answer 3

您想要设置一个Content-disposition标头