servlet to display image not working randomly
Hi, all
I use a servlet to read different png file into byte[] according request, then I send it to browser client. Here is the code:
code
os=response.getOutputStream();
byte[] rawPNG=null;
try {
String imagePath=<image location>
FileInputStream fis=new FileInputStream(imagePath);
int imageSize=fis.available();
rawPNG=new byte[imageSize];
int offset=0,counter=0;
while ( offset < imageSize ) {
counter=fis.read(rawPNG,offset,imageSize-offset);
offset+=counter;
//System.out.println("size="+imageSize+",offset="+offset+",read="+counter);
}
fis.close();
} catch (Exception e) {
// read image error
}
try {
sr.setContentType("image/png");
sr.setContentLength(rawPNG.length);
os.write(rawPNG);
os.flush();
//os.close();
} catch (Exception e) {
// send image error
}
code
Usually, 4 correct images returned in 5 request. No exception observed. Why this servlet failed randomly? I don't have a clue.
BTW: If I uncomment 'os.close();' line, I got 'java.io.Excepiton: Closed' error message. Why it happends?
Thanks,
Vincent Chen
