I have some Android code that can send files to my webserver using an
HttpsUrlConnection, but when it tries to send larger files I get an
OutOfMemory exception when opening the OutputStream. Can anyone offer
some assistance?
It looks something like this:
httpConn = (HttpsURLConnection) new URL(uri).openConnection();
httpConn.setDoInput(true);
httpConn.setDoOutput(true);
httpConn.setUseCaches(false);
httpConn.setRequestMethod("POST");
This is where I try different things. The closes solution has been:
httpConn.setChunkedStreamingMode(1024);
In this case, I don't get the OutOfMemory immediately when opening the
OutputStream, but I see the heap growing as I os.write() and it
eventually runs out.
httpConn.connect();
OutputStream os = httpConn.getOutputStream();
byte[] buffer = new byte[4096];
int len;
while ((len = is.read(buffer)) != -1){
os.write(buffer, 0, len);
}
os.flush();
Each time I open the .getOutputStream() the contents of the file I am
trying to send is loaded into memory, per the discussion here (http://
bugs.sun.com/bugdatabase/view_bug.do?bug_id=4212479) -- so I go out of
memory.
My server supports HTTP 1.1. I've tried the following code.
1. httpConn.setRequestProperty("Transfer-Encoding","chunked");
2. httpConn.setChunkedStreamingMode(1024);
3. httpConn.setRequestProperty("Content-Length", length);
4. httpConn.setFixedLengthStreamingMode(1024)
5. Combo of 1+2.
6. Combo of 3+4
Can anyone offer any assistance?! It seems like no matter what, the
data going to the OutputStream is being buffered. ChunkedStreamMode
seems to just buffer it in pieces, whereas it would otherwise buffer
it all at once. Both go out of memory.
Thanks in advance.
PS> I have similar code for J2ME and memory has not been a problem.
Also, if I try to send two medium sized files in a row, the first one
makes it, but then the heap doesn't seem to compact and the second one
fails.
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