I am new to jsp and servlet. My scenario is as follows
I have a jsp page which have a form in it. with two fields. The code snipet of the jsp page is as follows.
MyFirstJSP.jsp file
<body>
<h1> This is my first jsp and servlet project</h1>
<%
//System.out.println(request.getAttribute("fname"));
if(request.getAttribute("fname")!=null){
System.out.println(request.getAttribute("fname"));
}else{
System.out.println("No request ");
}
%>
<form action="MyFirstServlet" method="get">
First Name<input type="text" name="fname" value= ${fname}><br>
Last Name<input type="text" name="lname" value= ${lname}>
<input type="submit" value="Send">
</form>
</body>
When I submit this form the MyFirstServlet is called which checks the first name entered by user. If the first name is equals to "abc" then servlet sets the attribute to request object and send redirect it to the callsing jsp page i.e. above page. Which will get the value from request object and fill it in to respective field of form. I have Java Expression language too for same effect.
Here is my code snipet of the MyFirstServlet.java servlet file
/**
* Servlet implementation class MyFirstServlet
*/
public class MyFirstServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public MyFirstServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub
String firstname=request.getParameter("fname");
if(firstname.equalsIgnoreCase("abc")){
System.out.println("Setting attributes");
request.setAttribute("fname",firstname);
request.setAttribute("lname",request.getParameter("lname"));
response.sendRedirect("MyFirstJSP.jsp");
}else{
System.out.Println("No problem");
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
PrintWriter p=response.getWriter();
p.println("Success!");
doGet(request,response);
}
}
But when I execute the code the servlet redirects to the jsp page but not fills the form fields with the respective values. As to find the cause I have added the if-else-block to know the cause and I get to know that the request objects attribute is not available here.
If I use the request dispatcher in this case then the values are gets available and the form is gets filled with the values but the url in the address bar does not chage and always shows the url to the servlet.
So My query is
**1)Why the request object is not available to jsp page using sendRedirect.
2)Is thre any other way to show my form in jsp page prefilled with the values entered by user if the servlet sendredirects to the calling jsp so that user need not to reenter the data in to form.**
Please guide me friends in this problem Thank You!