How to play mp3 file using Blob-key of blob store of app engine in jsp file with HTML5 audio tag?
blobstore, google-app-engine, html5-audio, jsp
Solution
Your audio tag's `src` attribute should point to an Url where a blob (audio stream) can be downloaded. Instead it just holds a value of the blob key (which is a random string and not an Url, so it does not point anywhere).
It's best to start reading how to serve a blob.
Basically, there isn't an universal blob-serving url, that you could just make a request to and it would serve your blob. You need to create a servlet that serves blobs (see example in the link) and then point the HTML5 audio control to it via `src="/path/to/your/blob/servlet?key=<%=request.getParameter("blob-key")%>"`.
Problem
I uploaded my 4MB mpe file in App engine blobstore. By retrieving its Blob-key, i tried to play it in jsp file using HTML 5 audio tag. But its not working . The code is given below: ``` <%@page import="com.google.appengine.api.blobstore.BlobKey" %> <%@page import="com.google.appengine.api.blobstore.BlobstoreService" %> <%@page import="com.google.appengine.api.blobstore.BlobstoreServiceFactory" %> <html> <head> <meta http-equiv="Content-Type" content="audio/mpeg3; charset=ISO-8859-1"> <title>Insert title here</title> </head> <body> <% BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService(); BlobKey blobKey = new BlobKey(request.getParameter("blob-key")); %><%=request.getParameter("blob-key")%> <audio controls="controls"> <source src="<%=request.getParameter("blob-key")%>" type="audio/mp3" /> </audio> </body> </html> ```