Commonly used method of ServletResponse interface

1- setContentType():
                              Is used to specify MIME type of response. Content type is also known as MIME (Multipurpose internet mail extension) type. It is a HTTP header that provides the description about what are you sending to the browser.
public void setContentType(String MIMEType);

MIME type has 2 part:

Major part represent type of content and miner part specify the format of content.

Commonly used MIME types (content types) are:

text/html	image/gif	audio/mp3	application/pdf
text/xml	image/jpg	audio/wav	application/msword
text/plain	image/bmp		application/vnd.ms-excel
			application/jar

                           

2- getWriter():
                        Is used to obtain PrintWriter Object for writing data to the response Object.
public PrintWriter getWriter();

3- getOutputStream():
                                    Is used to obtain an OutputStream object for writing data to the response Object.
public OutputStream getOutputStream();

Note: Only one of the stream (PrintWriter/OutputStream) can be open in a Servlet for generating response. getWriter              Character Oriented     For HTML content getOutputStream   byte oriented             For File downloading program