ntroduction to 'response' implicit object
When the webserver receives an http request, it creates a response object that is implicitly available to the jsp page. The developer can use it to construct the http response that is to be sent to the http client by using the commonly used methods shown in the table blow.
response is an instance of javax.servlet.http.HttpServletResponse.
Let's see how to use response to send http status code 601 and a message to the http client.
The above code will produce the following webpage :
The commonly used methods of response object are :
response is an instance of javax.servlet.http.HttpServletResponse.
Let's see how to use response to send http status code 601 and a message to the http client.
<html>
<body>
<%
response.sendError(601, "Unauthorized access");
%>
</body>
</html>
The above code will produce the following webpage :
The commonly used methods of response object are :
| Method | Description |
|---|---|
| void addHeader(String, String) | Add the given header to http response sent to client |
| void addDateHeader(String, long) | Convenience method to add a date as header |
| void addIntHeader(String, int) | Convenience method to add an integer as header |
| boolean containsHeader(String) | Checks whether given header is already present in response |
| void sendRedirect(String) | Use to redirect browser to the given url |
| void setCharacterEncoding(String) | Convenience method to set character encoding header |
| void setContentLength(int) | Convenience method to set content length header |
| void setContentType(String) | Convenience method to set content type header |
| void setStatus(int) | Sets the http status code of response |
| void sendError(int) | Same as above |
| void sendError(int, String) | Same as above. Also sets http status message |