如何从JSP下载附件文件 [英] How to download attachment file from JSP

问题描述

我想知道如何根据邮件服务器中的内容配置(附件)从JSP页面下载任何文件.

I want to know how can I download any file from JSP page based on content disposition as an attachment from mail server.

我想在JSP页面上创建一个链接，通过单击该链接，用户可以从邮件服务器下载文件.该链接应用于内容发布的附件类型.如何在JSP中做到这一点?

I want to create a link on JSP page, and by clicking on that link user can download file from mail server. The link should be for content dispostion's attachment type. How can I do that in JSP?

推荐答案

请勿为此使用JSP，因为它会打印<% %>标记之外的所有空白，所以使用它来流二进制文件时会遇到麻烦.以及只会破坏二进制内容的响应.您需要做的只是在JSP中放置一个HTML链接，如<a href="fileservlet/file.ext">，并使用servlet类来完成所有处理和流传输任务.要设置响应标头，只需使用

Don't use a JSP for this, it's recipe for trouble when using it to stream binary files, because all whitespace outside the <% %> tags will be printed to the response as well which would only corrupt binary content. All you need to do is to just place a HTML link like <a href="fileservlet/file.ext"> in the JSP and use a servlet class to do all the processing and streaming task. To set a response header, just use HttpServletResponse#setHeader().

response.setHeader("Content-Disposition", "attachment;filename=name.ext");

您可以在此处找到一个基本的servlet示例，该示例正是这样做的: FileServlet .

You can find here a basic servlet example which does exactly this: FileServlet.

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