Handling HTTP GET Requests
The following servlet handles an HTTP GET request. The servlet is invoked when a form on a Web page is submitted. The example contains two files. A Web page is defined in ColorGet.html and a servlet is defined in ColorGetServlet.java. The HTML source code for ColorGet.htm is shown in the following listing. It defines a form that contains a select element and a submit button. Notice that the action parameter of the form tag specifies a URL. The URL identifies a servlet to process the HTTP GET request.
ColorGet.html Program:
<html>
<body>
<center>
<form name="Form1"
action="http://localhost:8080/servlets-examples/servlet/ColorGetServlet">
<B>Color:</B>
<select name="color" size="1">
<option value="Red">Red</option>
<option value="Green">Green</option>
<option value="Blue">Blue</option>
</select>
<br><br>
<input type=submit value="Submit">
</form>
</body>
</html>
ColorGetServlet.java:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ColorGetServlet extends HttpServlet
{
public void doGet(HttpServletRequest request,HttpServletResponse response)throws ServletException, IOException
{
String color = request.getParameter("color");
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
pw.println("<B>The selected color is: ");
pw.println(color);
pw.close();
}
}
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