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Java Servlet Programing Laungage

Java Servlet Projects

Servlet Project 3

Java Servlet :Example of doGet and doPost Method
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When a servlet is first called from a web browser by typing the url to the servlet in the address bar,POST method is used as the request method.At the server side,the doPost method is invoked.The servlet sends a string saying "The servlet has received a POST.now,click the button below.

The form is sent to the browser uses the GET method.When the user clicks the button to submit the form,a GET request is sent th the server.The servlet then invoked the doGet method,sending a string saying "The servlet has received a GET.Thank you.

index.html

<html>
	<head>
	 <title>Application of post and get method</title>
	</head>
	<body>
	 <form method="post" action="post">
	 Name<input type="text" name="txtName"><br>
	 <input type="submit" value="click">
	 </form>
	</body>
<html>

 

web.xml

<web-app>
	<servlet>
	 <servlet-name>s1</servlet-name>
	 <servlet-class>POstMethod</servlet-class>
	</servlet>
	<servlet-mapping>
	 <servlet-name>s1</servlet-name>
	 <url-pattern>post</url-pattern>
	</servlet-mapping>
	<servlet>
	 <servlet-name>s1</servlet-name>
	 <servlet-class>POstMethod</servlet-class>
	</servlet>
	<servlet-mapping>
	 <servlet-name>s1</servlet-name>
	 <url-pattern>get</url-pattern>
	</servlet-mapping>
</web-app>

RegisterServlet.java

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class RegisterServlet extends HttpServlet
{
 public void doPost(HttpServletRequest req,
  HttpServletResponse res)throws ServletException,IOException
{
 res.setContentType("text/html");
 PrintWriter out=res.getWriter();
 out.println("The servlet has received a POST."+"now,click the button below");
 out.println("<br><a href='get'>Click here</a>");
}
public void doGet(HttpServletRequest req,
 HttpServletResponse res)throws ServletException,IOException
{
 String name=req.getParameter("txtName");
 res.setContentType("text/html");
 PrintWriter out=res.getWriter();
 out.println("The servlet has received a GET.Thank you.");
}
}
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