Servlet Request Interface

Servlet Request Interface:

A challenge of ServletRequest is used to give the client request information to a servlet, for instance, content sort, content length, parameter names and qualities, header informations, attributes.

Example of ServletRequest to display the name: index.html

1. <form action="welcome"method="get">
2. Enter your name<input type="text"name="name"><br>
3. <input type="submit"value="login">
4. </form>

DemoServ.java

1. importservlet.http.*;
2. importservlet.*;
3. importio.*;
4. publicclass DemoServ extends HttpServlet{
5. publicvoid doGet(HttpServletRequest req,HttpServletResponse res)
6. throwsServletException,IOException
7. {
8. setContentType("text/html");
9. PrintWriter pw=res.getWriter();
11. String name=req.getParameter("name");//will return value
12. println("Welcome "+name);
14. close();
15. }}

RequestDispatcher:

A challenge of ServletRequest is used to give the client request information to a servlet, for instance, content sort, content length, parameter names and qualities, header informations, attributes.

Methods of RequestDispatcher interface:

1. public void forward(ServletRequest request, ServletResponse response)throws ServletException, java.io.IOException.
2. public void include(ServletRequest request, ServletResponse response)throws ServletException, java.io.IOException.

forward( ) method: Include( ) method:Syntax of getRequestDispatcher method:

1. publicRequestDispatcher getRequestDispatcher(String resource);