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lakshmi
java
1 Answer(s)      6 years and 4 months ago
Posted in : JSP-Servlet



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September 13, 2008 at 10:38 AM


Hi lakshmi,


When you invoke a Servlet, the servlet engine passes the information on to the Servlets service() method. This method determines the type of request made (GET, POST, HEAD, ...) and calls the function doTYPE, like doGet, doPost. GET and POST just differ in the way form data is sent from the browser to the server. The method doGet handles data that has been attached to the url in the form url questionmark (name=value ampersand)+. Typically in a CGI you would have to read the environment variable QUERY_STRING to get this string of concatenated parameternames and values. With the doPost method, form data comes in through standard input stream, a cgi would just need to open the input stream and read until EOF to get the form data.


---------------------------------------------
Here is the simple code.

package javacode;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class HelloWorld extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
out.println("Hello World");
}
}


---------------------------------------

Visit for more information.

http://www.roseindia.net/servlets/

Thanks & Regards

Amardeep


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