Image through a servlet gives out of memory at the client

[sanket2612]

Hi,

I have a J2me client which needs to request images from a servlet and display them. The code that I am using at the servlet is something like this :

File f = new File(AppConstants.LOCAL_CONTEXT_PATH+"/"+path);
BufferedImage img = ImageIO.read(f);

ServletOutputStream ostr;

response.setContentType("image/png");

ostr = response.getOutputStream();

ImageIO.write(img,"png",ostr);

ostr.close();

However, the client residing on the emulator gives me an out of memory exception while trying to read the image.

Is there a better way to achieve the same, except for direct url hits?

And the emulator is the standard WTK emulator.

Awaiting a reply.

Thanks in advance.

[rdrincon]

Hello sanket2612

Can you post relevant code you are using on the J2ME client to restore the image? and tell us what emulator are you using?

[jappit]

Probably the problem is related to your image size, that is too big to be successfully handled by emulator (and probably by real mobile devices too). Trying optimizing/scaling down your image should help..

Pit

[sanket2612]

Hi,
Thanks for your replies.
My image size ranges from 8 to 15 k.
Scaling down is feasible for my application.
The client code goes like this :

try {
conn = (HttpConnection)Connector.open(request.getURL(), 3, true);
// conn = (HttpConnection)Connector.open(formatURL(request.getURL()), 3, true);
conn.setRequestProperty("User-Agent", userAgent);
conn.setRequestProperty("Accept-Charset", acceptCharset);
conn.setRequestProperty("Accept-Language", acceptLanguage);
conn.setRequestProperty("Connection", "close");
Hashtable hashtable = request.getRequestProperty();
if(hashtable != null) {
String s;
String s1;
for(Enumeration enumeration = hashtable.keys(); enumeration.hasMoreElements(); conn.setRequestProperty(s, s1)) {
s = (String)enumeration.nextElement();
s1 = (String)hashtable.get(s);
}
}
conn.setRequestMethod(request.getRequestMethod());
if(request.getRequestMethod().equals("POST")) {
out = conn.openOutputStream();
//System.out.println("The data="+new String(request.getBody()));
out.write(request.getBody());
out.flush();
// //System.out.println(request.getURL()+"......The length in the Connector ---------------------------" + request.getByteBody().length);
out.close();
}
c_starttime=System.currentTimeMillis();
//System.out.println(c_starttime);

in = conn.openInputStream();

//System.out.println("After conn.openInputStream");

int i = (int)conn.getLength();

//System.out.println("****Length :"+i);

byte abyte0[] = null;
if(i == -1) {
// //System.out.println("******LENGTH OF THE INPUT STREAM NOT KNOWN*******");
ByteArrayOutputStream bytearrayoutputstream = new ByteArrayOutputStream();
byte abyte1[] = new byte[512];
int l = 0;
try {
while((l = in.read(abyte1)) != -1 && !timeout)
{
if((System.currentTimeMillis()-c_starttime)>ResourceManager.timeout)
// if((System.currentTimeMillis()-c_starttime)>100)
{
ResourceManager.imageTimeout=true;
timeout=true;
cleanUp();
if(conn!=null)
{
conn.close();

}
// //System.out.println("RETURNING NULL DUE TO TIME OUT AFTER READING"+l);
return response2;
}
bytearrayoutputstream.write(abyte1, 0, l);
}
}
catch(Exception exception2) {
exception2.printStackTrace();
}
abyte0 = bytearrayoutputstream.toByteArray();
} else {
abyte0 = new byte[i];
try {
int j = 0;
int k;
while((k = in.read(abyte0, j, abyte0.length - j)) > 0 && !timeout) {
if((System.currentTimeMillis()-c_starttime)>ResourceManager.timeout)
// if((System.currentTimeMillis()-c_starttime)>100)
{
ResourceManager.imageTimeout=true;
timeout=true;
}
j += k;
// //System.out.println("Length of strem "+abyte0.length+" amt read"+j);
if(j == abyte0.length)
break;
}
if(j!=abyte0.length)
{
// //System.out.println("RESPONSE NULL DUE TO TIME OUT");

cleanUp();
if(conn!=null)
{
conn.close();
}
return response2;
}
}
catch(Exception exception1) {
exception1.printStackTrace();
}
}
Response response = new Response(conn.getResponseCode(), conn.getType(), abyte0);
saveResponseHeader(request.getURL(), response);
response2 = response;
cleanUp();
} catch (RuntimeException e) {
// TODO Auto-generated catch block
e.printStackTrace();
//System.out.println("Exception---con--abc"+e.toString());
}


It works well when the images are direct url hits, like

www.xyz.com/123.png

but not in the eralier case.

I just want to know whether there is any work around.

Thanks