how to write hello world servlet Example

Question

javaclass

package com.example;

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

// Extend HttpServlet class
public class Helloworld e         


        

Answer 1

Use following :

<servlet>
    <servlet-name>HelloForm</servlet-name>
    <servlet-class>com.example.Helloworld</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>HelloForm</servlet-name>
    <url-pattern>/HelloForm</url-pattern>
</servlet-mapping>

and type your url: like localhost:8080/projectName/HelloForm It may work. And I think you are beginner so go This link . Here is complete tutorial...aboutt this

Answer 2

Now you can switch to servlet 3.0. It's really simple.

@WebServlet("/example")
public class AnnotationServlet extends HttpServlet{

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        PrintWriter prinOut = response.getWriter();
        prinOut.write("Hello, This is the first servlet 3 annotation example");
    }

}

From Servlet 3.0 Annotation Example in Java

And here is full Java Servlet Tutorial

Answer 3

you haven't specified the package of the servlet class write like this com.example.Helloworld

Answer 4

Your class resides in com.example

So servlet-class should,

<servlet-class>com.example.Helloworld</servlet-class>

Answer 5

You have created servlet class like this:

public class Helloworld extends HttpServlet

But in web.xml you have mapping like this:

<servlet-class>HelloForm</servlet-class>

You need to have same name, so you're getting 404 error. Change either your servlet name to HelloForm or change <servlet-class> to HelloWorldin web.xml

Answer 6

Following way will work.

Create a folder(your poject name,example project) in webapps Inside proect folder create another folder,name it as WEB-INF. Inside WEB-INF past the web.inf file. Create another folder classes inside project folder and keep the .class files. now modify your web.xml as Himanshu Bhardwaj has suggested. restart the server.Then run