使用 URLConnection 将文件下载到 SD 卡期间获取 InputStream 时出现 FileNotFoundException

发布于 2024-10-27 19:55:21 字数 1088 浏览 4 评论 0原文

我正在开发具有如下工作流程的应用程序：

1.解析主页（使用 HttpURLConnection、connect()、执行操作、disconnect()、使用数据），

2.单击我制作的链接后，解析文章或下载文件基于链接。

第一步工作完美&在文章的情况下也是第二个，但是当我尝试从特定网址下载文件并将其保存到 SD 卡时，我在这一行中得到了 fileNotFoundException：

  InputStream inputStream = urlConnection.getInputStream();

我的执行指南（下载文件）的代码在这里进行了解释 http://goo.gl/GTBOP 并且我根据此操作的需要在清单中设置了权限，并且在任何下载操作之前我检查了 MEDIA_MOUNTED & MEDIA_MOUNTED_READ_ONLY 状态，看起来很合适。

所以..我在 stackOverflow 和其他地方读到了很多关于这个问题的内容，并且尝试了不同的建议，例如添加这些：

urlConnection.setRequestProperty("User-Agent","Mozilla/5.0 ( compatible ) ");
urlConnection.setRequestProperty("Accept","*/*");

或

System.setProperty("http.keepAlive", "false");

但没有成功。我仍然被 fileNotFoundException 困扰。我试图从网页捕获响应代码，它显示 404..？！

奇怪的是，如果我硬编码到文件的链接以便从任何其他站点下载，它会毫无问题地下载文件。因此，为了清楚起见，我选择了指向 fileurl 变量的单击链接，但在下一步中，我只是说 fileurl="somesite/somefile.ext" 一切都很顺利。.从网络浏览器中，我可以下载任何在我的应用程序中造成麻烦的文件，所以我我很困惑问题出在哪里..

请问有什么建议吗..？ 10q

原文

I'm working on application which has workflow like this:

1.parsing home page (using HttpURLConnection, connect(), do stuff, disconnect(), use data),

2.after click on links I made, parsing article or download file based on link.

First step works perfect & 2nd too in case of article, but when I'm trying to download file from specific url and save it to SD card, I got fileNotFoundException in this line:

  InputStream inputStream = urlConnection.getInputStream();

My guide for doing it (downloading file) was code explained here http://goo.gl/GTBOP and I set permissions in manifest as required for this action, plus before any download operation I checked MEDIA_MOUNTED & MEDIA_MOUNTED_READ_ONLY state and it seems like that fits nice.

So..I read a lot about this problem on stackOverflow and other places and I tried different suggestions like adding these:

urlConnection.setRequestProperty("User-Agent","Mozilla/5.0 ( compatible ) ");
urlConnection.setRequestProperty("Accept","*/*");

System.setProperty("http.keepAlive", "false");

but with no success. I'm still stucked with fileNotFoundException. I tried to catch response code from webpage and it says 404.. ?!

It's strange that if I hardcode link to file for downloading from any other site it downloads file without any troubles. So to make it clear I pickup clicked link to fileurl variable but in a next step I just say fileurl="somesite/somefile.ext" everything goes smooth.. From web browser I can download any file that make troubles in my application so I'm confused where is the problem..

Any suggestion please..? 10q

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