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

Answer 1

If you got the OutputStream from the response , you can write the contents of the OutputStream to the response which will be sent back to the browser . Sample code :

OutputStream outStream = response.getOutputStream();
response..setHeader("Content-Disposition", "attachment; filename=datafile.xls");
response.setContentType("application/vnd.ms-excel");
byte[] buf = new byte[4096];
int len = -1;
while ((len = inStream.read(buf)) != -1) {
    outStream.write(buf, 0, len);
}

outStream.flush();
outStream.close();

Read this : Content-Disposition:What are the differences between “inline” and “attachment”?

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In your case the method definition is :

public static OutputStream decryptAsStream(InputStream inputStream,
                                            String encryptionKey)

So you can get the OutputStream from that method as :

OutputStream os = ClassName.decryptAsStream(inputStream,encryptionKey);

And then use the os .