使用Uri从SD卡获取文件

Question

我让用户从SD卡中选择一个文件上传到我的服务器并保存Uri它返回给我onActivityResult

例:

file:///storage/emulated/0/Download/menu-4.27.13.pdf

当我尝试将其转换为字节数组发送到服务器时,我得到了 FileNotFoundException

if(!fileURI.equals("")){
    File pdf = new File(fileURI);
    try 
    {
        FileInputStream fin = new FileInputStream(pdf);

        byte fileContent[] = new byte[(int)pdf.length()];
        fin.read(fileContent);
        fin.close();

        String pdfString = Base64.encode(fileContent);
        sb.append(pdfString);
    } 
    catch (FileNotFoundException e) 
    {
        e.printStackTrace();
    }
    catch(IOException ioe)
    {
        ioe.printStackTrace();                      
    }
}

}

堆栈跟踪

11-04 11:57:30.597: W/System.err(13531): java.io.FileNotFoundException: /file:/storage/emulated/0/Download/menu-4.27.13.pdf: open failed: ENOENT (No such file or directory)
11-04 11:57:30.597: W/System.err(13531):    at libcore.io.IoBridge.open(IoBridge.java:409)
11-04 11:57:30.607: W/System.err(13531):    at java.io.FileInputStream.<init>(FileInputStream.java:78)
11-04 11:57:30.607: W/System.err(13531):    at com.ecm2.mobilemap.services.MessageService.getModifiedElements(MessageService.java:2755)
11-04 11:57:30.617: W/System.err(13531):    at com.ecm2.mobilemap.services.MessageService.callSync(MessageService.java:2433)
11-04 11:57:30.617: W/System.err(13531):    at com.ecm2.mobilemap.services.MessageService.onHandleIntent(MessageService.java:190)
11-04 11:57:30.627: W/System.err(13531):    at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:65)
11-04 11:57:30.627: W/System.err(13531):    at android.os.Handler.dispatchMessage(Handler.java:99)
11-04 11:57:30.637: W/System.err(13531):    at android.os.Looper.loop(Looper.java:137)
11-04 11:57:30.637: W/System.err(13531):    at android.os.HandlerThread.run(HandlerThread.java:61)
11-04 11:57:30.637: W/System.err(13531): Caused by: libcore.io.ErrnoException: open failed: ENOENT (No such file or directory)
11-04 11:57:30.647: W/System.err(13531):    at libcore.io.Posix.open(Native Method)
11-04 11:57:30.657: W/System.err(13531):    at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
11-04 11:57:30.657: W/System.err(13531):    at libcore.io.IoBridge.open(IoBridge.java:393)

那个File对象在初始化时不是什么字符串？为什么我得到FileNotFoundException时,我有Uri回到了我,当用户选择的文件

Answer 1

您Uri包含file:需要删除的方案.使用Uri.parse,你想象你的字符串中包含的Uri,使用uri.getPath(),你从uri中提取文件路径:

Uri uri = Uri.parse(fileURI);
File pdf = new File(uri.getPath());