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Java-10cs753-Downloadable-->View question


Asked On2017-05-20 09:25:15 by:arunwebber

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An individual developing servlet for handling HTTP Requests needs to override one of these methods in order to process the request and generate a response. The servlet is invoked dynamically when an end-user submits a form. Example:

<form name="F1" action=/servlet/ColServlet>

Select the color: <select name = "col" size = "3">

<option value = "blue">Blue</option>

<option value = "orange">Orange</option>

</select>

<input type = "submit" value = "Submit">

</form>

Here‟s the code for ColServlet.java that overrides the doGet() method to retrieve data from the HTTP Request and it then generates a response as well

// import the java packages that are needed for the servlet to work import java.io .*; import javax.servlet. *;

import javax.servlet.http. *;

// defining a class

public class ColServlet extends HttpServlet { public void doGet(HttpServletRequest request,HttpServletResponse response)

throws ServletException, IOException

// request is an object of type HttpServletRequest and it's used to obtain information

// response is an object of type HttpServletResponse and it's used to generate a response

// throws is used to specify the exceptions than a method can throw

{

String colname = request.getParameter("col");

// getParameter() method is used to retrieve the selection made by the user response.setContentType("text/html");

PrintWriter info = response.getWriter();

info .println("The color is: ");

info .println(col); info.close();

}

}



Answerd on:2015-12-01 Answerd By:neenu2

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