如何SourceForge上的下载页面的工作？ [英] How does SourceForge's download page work?
问题描述
在回答其他问题时也指出，SourceForge上的下载页面中加入一个隐藏＆LT工作; IFRAME取代。但这似乎不再是这种情况...
In answers to other questions it was pointed out that SourceForge's download page worked by adding a hidden <iframe>. This does no longer seem to be the case...
如何在下载页面的当前版本中实现？我想建立，因为我认为顺丰的解决方案很优雅类似的东西。
How is the current version of the download page implemented? I'd like to build something similar because I consider SF's solution quite elegant.
好了，更多的precisely ......的确，最初的问题过于含糊。
Ok, more precisely...True, the initial "question" was too vague.
如果你去<一href="http://sourceforge.net/projects/beankeeper/files/beankeeper/2.6.2/beankeeper-2.6.2.tar.gz/download" rel="nofollow">http://sourceforge.net/projects/beankeeper/files/beankeeper/2.6.2/beankeeper-2.6.2.tar.gz/download有一个普通的旧的HTML链接，下载有问题的文件，但也有一个自动下载。延迟似乎有些2S。
If you go to http://sourceforge.net/projects/beankeeper/files/beankeeper/2.6.2/beankeeper-2.6.2.tar.gz/download there's a plain old HTML link to download the file in question but there's also an automatic download. The delay seems to be some 2s.
有人问我的特殊用例。我会回答，知道，它可能会从OP转移到一定程度。很简单：
Someone asked for my particular use case. I'll answer that knowing that it might divert from the OP to a certain extent. Very much simplified:
- 在或多或少传统的Java EE应用程序有两个Servlet
- 调度程序的Servlet它作为一个切入点UI控制器
- 在一个文档的Servlet的流PDF浏览器，它也具有内容处置=附件IE浏览器显示保存，或打开对话框
- 在打印出网页与多个输入字段和一个提交按钮
- 点击提交按钮时，
- 输入字段的值应该是在UI模型更新（和会话如需要） - >这就是调度的Servlet确实
- 创建PDF必须被触发 - >这就是该文件的Servlet确实
- more or less traditional Java EE app with two Servlets
- a dispatcher Servlet which acts as an entry point for the UI controller
- a "document Servlet" which streams PDF to the browser, it does so with content-disposition=attachment i.e. browser shows save-or-open dialog
- a print out page with a number of input fields and a submit button
- when the submit button is clicked
- the input field values should be updated in the UI model (and session where necessary) -> that's what the dispatcher Servlet does
- the creation of the PDF must be triggered -> that's what the document Servlet does
如果我采用了SF的模型中的表单提交将触发调度Servlet和重新加载当前页面（常规行为）。一旦页面重载我会以某种方式 - 右边，怎么SF做到这一点？ - 导致浏览器调用文件的Servlet
If I adopted SF's model a form submit would trigger the dispatcher Servlet and reload the current page (regular behavior). Upon reload of the page I would somehow - right, how does SF do that? - cause the browser to invoke the document Servlet.
推荐答案
只是在页面加载改变窗口的位置。
Just change the window location during page load.
下面是一个 SSCCE ，只是copy'n'paste'n'run吧。
Here's an SSCCE, just copy'n'paste'n'run it.
<!doctype html> <html lang="en"> <head> <title>SO question 2222034</title> <script> window.onload = function() { setTimeout(function() { window.location = 'http://download.java.net/maven/1/jstl/jars/jstl-1.2.jar'; }, 2000); // It's "cool" to let user wait 2 more seconds :/ } </script> </head> <body> <p>The download of jstl-1.2.jar will start shortly...</p> </body> </html>或者，如果你需要使用POST，只需提交一个隐藏的表单：
Or if you need to use POST, just submit a hidden form:
<!doctype html> <html lang="en"> <head> <title>SO question 2222034</title> <script> window.onload = function() { setTimeout(function() { document.getElementById('downloadform').submit() }, 2000); // It's "cool" to let user wait 2 more seconds :/ } </script> </head> <body> <p>The download of jstl-1.2.jar will start shortly...</p> <form id="downloadform" action="http://download.java.net/maven/1/jstl/jars/jstl-1.2.jar"></form> </body> </html>这篇关于如何SourceForge上的下载页面的工作？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
