What is the use of HttpServletResponseWrapper?
Class HttpServletResponseWrapper. Provides a convenient implementation of the HttpServletResponse interface that can be subclassed by developers wishing to adapt the response from a Servlet. This class implements the Wrapper or Decorator pattern. Methods default to calling through to the wrapped response object.
What is the HttpServletResponse?
HttpServletResponse is a predefined interface present in javax. servlet. http package. It can be said that it is a mirror image of request object. The response object is where the servlet can write information about the data it will send back.
Which method sets the local of the response?
setLocale. Sets the locale of the response, if the response has not been committed yet. It also sets the response’s character encoding appropriately for the locale, if the character encoding has not been explicitly set using setContentType(java. lang.
What is the use of response setHeader in Java?
setHeader() is method of Servlet response object to set HTTP response header. refresh is HTTP response header …so we use response. setHeader(“refresh”,”5″); it will auto refresh the page at interval of 5 second..
How do I use sendRedirect?
Syntax:
- sendRedirect() accepts the respective URL to which the request is to be redirected.
- Can redirect the request to another resource like Servlet, HTML page, or JSP page that are inside or outside the server.
- It works on the HTTP response object and always sends a new request for the object.
What is the purpose of RequestDispatcher object?
The servlet container creates the RequestDispatcher object, which is used as a wrapper around a server resource located at a particular path or given by a particular name. This interface is intended to wrap servlets, but a servlet container can create RequestDispatcher objects to wrap any type of resource.
What is the difference between setHeader and addHeader methods?
addHeader: Adds a header to this message. The header will be appended to the end of the list. setHeader: Overwrites the first header with the same name. The new header will be appended to the end of the list, if no header with the given name can be found.
What is the difference between getParameter () and getAttribute () methods?
getParameter() returns http request parameters. Those passed from the client to the server. getAttribute() is for server-side usage only – you fill the request with attributes that you can use within the same request.
What is difference between sendRedirect and forward?
The main important difference between the forward() and sendRedirect() method is that in case of forward(), redirect happens at server end and not visible to client, but in case of sendRedirect(), redirection happens at client end and it’s visible to client.