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As we know 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 can set cookie, set ContentType, Buffer size of page, caching control by browser, CharSet, expiration time in cache.
Response object tells browser what output has to use or display on browser, and what stream of data contain PDF, html/text, Word, Excel.
| Method |
Return |
Description |
| addCookie(Cookie cookie) |
void |
Add specified cookies to response object |
| addDateHeader(String name,long date) |
void |
Adds response header with given name and date value |
| addHeader(String name,String value) |
void |
Adds response header with given name and value |
| encodeRedirectURL(String URL) |
String |
Encode specified URL for sendRedirect method |
| encodeURL(String URL) |
String |
Encode specified URL with session ID, if not unchanged URL return |
| flushBuffer() |
void |
Forces any content in buffer to be written in client |
| getBufferSize() |
int |
Returns actual buffer size used for response |
| getCharacterEncoding() |
String |
Returns character encoding for page in response MIME type charset=iso-8859-1 |
| getContentType() |
String |
Returns MIME type used for body in response text/html; |
| getOutputStream() |
ServletOutputStream |
Returns ServletOutputStream binary data stream to written in response |
| getWriter() |
PrintWriter |
Returns a PrintWriter object that can send character text to client |
| isCommitted() |
boolean |
Returns a Boolean, if response has been commited |
| resetBuffer() |
void |
Clear content in buffer of response without clearing header and status |
| sendRedirect(String location) |
void |
Sends a redirect response to client with redirect specified URL location. Contain Relative path |
| setBufferSize(int size) |
void |
Set a preferred buffer size for the body of response |
| setCharacterEncoding(String charset) |
void |
Set a character encoding for send to client response body charset=iso-8859-1 |
| setContentLength(int length) |
void |
Set a length of content body in response |
| setContentType(String contentType) |
void |
Set a content Type of response being sent to client, if response is yet not committed |
| setHeader(String name, String value) |
void |
Set a response header with given name and value |
Example of ContentType in JSP response object
setContentType.jsp
<%@ page language="java" %>
<%
response.setContentType("text/html");
%>
<html>
<head>
<title>Response object set Content type</title>
</head>
<body>
This is setting content type of JSP page
</body>
</html>
if documentation is in PDF format then setContentType as
<% response.setContentType("application/pdf"); %>
For Microsoft word document
<%
response.setContentType("application/msword");
%>
For Microsoft excel document
<%
response.setContentType("application/vnd.ms-excel");
%>
or
<%@ page contentType="text/html; charset=iso-8859-1" language="java" %>
Example of control page into cache
cacheControl.jsp
<%@ page language="java" %>
<%
response.setHeader("Cache-Control","no-cache");
/*--This is used for HTTP 1.1 --*/
response.setHeader("Pragma","no-cache");
/*--This is used for HTTP 1.0 --*/
response.setDateHeader ("Expires", 0);
/*---- This is used to prevents caching at the proxy server */
%>
<html>
<head>
<title>Response object in cache controlling</title>
</head>
<body>
This is no cache, Can test this page by open this page on browser and
then open any other website after press back button on browser,
if cacheControl.jsp is reload, it means it is not cached
</body>
</html>
Example of sendRedirect of Response Object
sendRedirect.jsp
<%@ page language="java" %>
<%
response.sendRedirect("http://yahoo.com");
/// response.sendRedirect("YouCanSpecifyYourPage.jsp");
%>
<html>
<head>
<title>Response object Send redirect</title>
</head>
<body>
This page redirects to specified URL location
</body>
</html>
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