如何从 xPages 流式传输文件? [英] How to stream file from xPages?

问题描述

我正在尝试将文件从文件系统流式传输到浏览器，但无法正常工作.我有一个带有 render=false 的 xpage，在 afterRenderResponse 上我有以下代码:

XspHttpServletResponse response = (XspHttpServletResponse) getFacesContext().getExternalContext().getResponse();response.setContentType("application/octet-stream");response.setHeader("Content-Disposition","attachment;filename=demofile.exe");File file = new File("文件路径");FileInputStream fileIn = new FileInputStream(file);ServletOutputStream out = response.getOutputStream();等等. .....

现在，当我尝试打开 xpage 时，我在控制台上收到错误消息:

java.lang.IllegalStateException:当 Writer 已在使用时无法获取 OutputStream在 com.ibm.xsp.webapp.XspHttpServletResponse.getOutputStream(XspHttpServletResponse.java:548)

'response.getOutputStream()' 方法引发了这样的错误，所以我无法让输出流工作.有没有人有这方面的经验?我只是想实现下载服务，以便我可以将文件从服务器文件系统流式传输回浏览器.

解决方案

您可以在 beforeRenderResponse 中调用 facesContext.getOutputStream() 而不是从 afterRenderResponse 中调用.

有关更多帮助，请参阅以下链接:

http://www.wissel.net/blog/d6plinks/SHWL-8BYMW8

http://www.wissel.net/blog/d6plinks/shwl-7mgfbn

I'm trying to stream the file from file system to browser and cant get it to work properly. I have a xpage with rendered=false and on afterRenderResponse I have the following code:

XspHttpServletResponse  response = (XspHttpServletResponse) getFacesContext().getExternalContext().getResponse();

response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition","attachment;filename=demofile.exe");

File file = new File("path to file");
FileInputStream fileIn = new FileInputStream(file);
ServletOutputStream out = response.getOutputStream();
etc. .....

Now when I try to open xpage I'm getting the error message as this on console:

java.lang.IllegalStateException: Can't get an OutputStream while a Writer is already in use
       at com.ibm.xsp.webapp.XspHttpServletResponse.getOutputStream(XspHttpServletResponse.java:548)

The method 'response.getOutputStream()' raises such error so I cant get output stream to work. Is there anyone having experience with this? I'm simply trying to implement the download service so I can stream files from server file system back to browser.

解决方案

You can call the facesContext.getOutputStream() in the beforeRenderResponse and NOT from afterRenderResponse.

Refer to the below links for more help:

http://www.wissel.net/blog/d6plinks/SHWL-8BYMW8

http://www.wissel.net/blog/d6plinks/shwl-7mgfbn

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