How can we read or use the contents of outputstream [closed]

Answer 1

Mainly you can use outputstreams to send the file contents as @The New Idiot mentioned. .pdf files, zip file, image files etc.

In such scenarios, get the output stream of your servlet and to that write the contentes

OutputStream outStream = response.getOutputStream();
FileInputSteram fis = new FileInputStream(new File("abc.pdf));
byte[] buf = new byte[4096];
int len = -1;
while ((len = fis.read(buf)) != -1) {
    outStream .write(buf, 0, len);
}
response.setContentType("application/octect");(if type is binary) else 
response.setContentType("text/html");
outStream .flush();
outStream.close();