response object

8/8/2019 Response Object

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HTTP Response



The response, response is a process to

responding against it request.

Response Object in JSP is used to send

information, or output from web server to

the user.

Response Object sends output in form of

stream to the browser.

This can be redirecting one file to another

file .



Response object tells browser what output

has to use or display on browser, andwhat stream of data contain PDF,

html/text, Word, Excel.

The result or the information of a requestis denoted with this object.

The response object handles the output of

the client.



This contrasts with the request object.

The class or the interface name of theresponse object is

http.HttpServletResponse.

The response object is written:

Javax.servlet.http.httpservletresponse.

The response object is generally used by

cookies.

The response object is also used withHTTP Headers.



HTTP Response Object Work in

Servlet

Request

Response

Http Client

Session

HttpServlet

doGet() {

Process request from Client

using Request object;

Send response to client via

the Response object;

}



Methods

setContentType();

addCookie(Cookie cookie)

addHeader(String name, String value)

containsHeader(String name)

setHeader(String name, String value)

sendRedirect(String)

sendError(int status_code)



setContentType()

setContentType() method of response object is used to

set the MIME type and character encoding for the page.

General syntax of setContentType() of response object

is as follows:

response.setContentType();



For example:

response.setContentType("text/html");

The above statement is used to set the

content type as text/html dynamically.



addCookie(Cookie cookie)

addCookie() method of response object isused to add the specified cookie to theresponse.

The addcookie() method is used to write acookie to the response.

If the user wants to add more than one

cookie, then using this method by calling itas many times as the user wants will addcookies.



General syntax of addCookie() of

response object is as follows:

response.addCookie(Cookie cookie)

For example:

response.addCookie(Cookie exforsys);

The above statement adds the specified

cookie exforsys to the response.



addHeader(String name, String value)

Adds response header with given name andvalue

If the header is already present, then value isadded to the existing header values.

General syntax of addHeader() of responseobject is as follows:

response.addHeader(String name, String

value)

Here the value of string is given as secondparameter and this gets assigned to the header given in first parameter as string name.



For example:

response.addHeader(" Author", Exforsys");

The output of above statement is as below:

Author: Exforsys



sendRedirect(String)

Sends a redirect response to client with redirect

specified URL location. Contain Relative path

Thus the sendRedirect method of the response

object enables one to forward a request to anew target.

But one must note that if the JSP executing has

already sent page content to the client, then thesendRedirect() method of response object will

not work and will fail.



General syntax of sendRedirect of

response object is as follows:

response.sendRedirect(String) ;

In the above the URL is given as string.

For example:

response.sendRedirect("http://abc.test.co

m/error.html");

response object

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