Navigating from one Page or Servlet to another.

The following example shows 2 methods to navigate from one servlet to another servlet or html or jsp page.
In this example the user selects a color and accordingly goes to the respective page.

Step 1 : Create a startup HTML or JSP page.

Enter the following code in the body tag of the page.
//create a drop down list to allow user to select their choice.
<form action="servlet1">
   <select name="color">
     <option value="red">Red</option>
     <option value="blue">Blue</option>
   </select>
   <input type="submit" value="Go!"/>
</form>

When User clicks the "Go!" the control of the application will pass to the servlet

Step 2 : Create a servlet (in my case named "servlet1")

Enter the following code in the doGet() method of the servlet

//assuming request as the object of the HttpServletRequest Class.
//assuming response as the object of the HttpServletResponse Class.


//accept user input and store it into a String variable.

String option = request.getParameter("color");

//following code shows 2 methods to go to another page or servlet.
//check the value selected by the user and pass the control to the respective page.

if(option.equals("red")){
 //Method 1
   RequestDispatcher rd = request.getRequestDispatcher("red.html");
   rd.forward(request, response);
} else if (option.equals("blue")){
 //Method 2
   response.sendRedirect("blue.html");
}


Step 3 : Create Result files

Enter the following code in the body tag of the "red.html"  file

<h1>Red</h1> 



Enter the following code in the body tag of the "blue.html"  file

<h1>Blue</h1>