Difference between GenericServlet and HttpServlet
GenericServlet:
- As name says it Generic in nature. Means GenericServlet is protocol-independent.
- import javax.servlet.servlet package
- super class of GenericServlet are java.lang.Object and it implements three interfaces Servlet, ServletConfig and java.io.Serializable
- To write a generic servlet, override the abstract service().
- GenericServlet lifecycle methods use ServletConfig interface.
- GenericServlet implements the log() from ServletContext interface.
- Prototype:
- public abstract class GenericServlet extends java.lang.Object implements Servlet, ServletConfig, java.io.Serializable
- Example:
import javax.servlet.*;
import java.io.*;
import javax.servlet.annotation.WebServlet;
@WebServlet(
name="WTAD",
urlPatterns={"/index.html","/BipinRupadiya.blogspot.com"}
)
public class GenricServletDemo extends GenericServlet
{
public void service(ServletRequest request, ServletResponse response)
throws ServletException,IOException
{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<HTML><HEAD><TITLE>WTAD</TITLE></HEAD> <body>");
String str="<h1>welcome to </h1>";
str=str+"<br>www.bipinrupadiya.blogspot.com";
out.println(str);
out.println("</body> </html>");
}
}
HttpServlet:
- As name says it is http protocol specific.
- Import javax.servlet.http package
- Supper class of HttpServlet is GenericServlet and it implements java.io.Serializable interface
- HttpServlet have all the properties of GenericServlet because it extends GenericServlet class
- To write HttpServlet we have to override at least one method of doGet(), doPost(),doPut(), doDelete(), init(), destroy(), getServletInfo()
- Prototype:
- public abstract class HttpServlet extends GenericServlet implements java.io.Serializable
- Example:
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import javax.servlet.annotation.WebServlet;
@WebServlet(
name="WTAD",
urlPatterns={"/index.html","/BipinRupadiya.blogspot.com"}
)
public class ServletDemo extends HttpServlet
{
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException,IOException
{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<HTML><HEAD><TITLE>WTAD</TITLE></HEAD> <body>");
String str="<h1>welcome to </h1>";
str=str+"<br>www.bipinrupadiya.blogspot.com";
out.println(str);
out.println("</body> </html>");
}
}
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