sendRedirect JSP Example

In the example, client sends user name to login (no password for simplicity). Server validates and sends back result of validation. If user name is successful, sends message "Login is Success" and fails sends a new login form to client to enter a new user name and repeat the process until login is successful. To send the new HTML login form to client, the JSP uses response.sendRedirect() method.

Example on sendRedirect JSP

Client-side HTML File Name: Login.html

  
Login User Name 
  


    Enter User Name  

    Click to Validate  

  

Server-side JSP File Name: SendForm.jsp

  <%
    String userName = request.getParameter("t1");   
    if(userName.equalsIgnoreCase("snrao"))
    {
      out.println("
Login is Success");
    }
    else
    {
      response.sendRedirect("Login.html");
    }
  %>
 

Screenshot of client Login.html form when some user name is entered.

Response of server when validation is successful.

Response to client of sending a fresh Login form. Observe the fresh (empty) form.

response.sendRedirect("Login.html");

sendRedirect() is a method of response object. We know earlier response object is one of the 9 implicit objects, JSP supports and also we know response object is an instance of HttpServletResponse. That is other way to say, sendRedirect() is a method of HttpServletResponse interface.

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