Simple Guess Number using Servlet

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 HelloServlet.java
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import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * Created by yubraj on 11/6/16.
 */
@WebServlet(urlPatterns = {"/HelloServlet"})
public class HelloServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.println("<html>");
        out.println("<body>");
        out.println("Hello World");
        out.println("</body>");
        out.println("</html>");
        out.flush();
        out.close();
    }
}

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LogonServlet.java
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import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * Created by yubraj on 11/6/16.
 */
@WebServlet(name = "LogonServlet", urlPatterns = {"/LogonServlet"})
public class LogonServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        PrintWriter out = response.getWriter();
        out.println("<html>");
        out.println("<body>");
        if(username.equals("user") && password.equals("pass")){
            out.print("Welcome user");
        }else {
            out.print("Wrong UserId or Password! Please try again");
            out.println("<form method=POST action=LogonServlet>");
            out.println("Username=<input type=text name=username> <br>");
            out.println("Password=<input type=text name=password>");
            out.println("<input type=submit value='Logon'>");
            out.println("</form>");
        }
        out.println("</body>");
        out.println("</html>");
        out.close();

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        PrintWriter out = response.getWriter();
        out.println("<html>");
        out.println("<body>");
        out.println("<form method=POST action=LogonServlet>");
        out.println("Username=<input type=text name=username> <br>");
        out.println("Password=<input type=text name=password>");
        out.println("<input type=submit value='Logon'>");
        out.println("</form>");
        out.println("</body>");
        out.println("</html>");
        out.close();
    }
}


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guessNumber.java
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import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Random;

/**
 * Created by yubraj on 11/6/16.
 */
@WebServlet(name = "guessnumber", urlPatterns = {"/guessnumber"})
public class guessnumber extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        HttpSession session = request.getSession(true);
        PrintWriter out = response.getWriter();
        int num = Integer.parseInt(request.getParameter("number"));
        int randNumber = Integer.parseInt(session.getAttribute("randNum").toString());

        out.println("<html>" +
                "<head>" +
                "<title>Guess Number Game</title>" +
                "</head>" +
                "<body>");
        if(num == randNumber){
            out.println("Congratulation you won");
            out.println("<br><a href='/guessnumber'>Try Again</a>");
        }else if(num>randNumber){
            out.println("Number is too high. Try Again!");
            out.println("<br><a href='/guessnumber'>Try Again</a>");
        }else{
            out.println("Number is too low. Try Again!");
            out.println("<br><a href='/guessnumber'>Try Again</a>");
        }
        out.println("</body></html>");

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        Random rand = new Random();
        int x = rand.nextInt(10);

        HttpSession session = request.getSession(true);
        session.setAttribute("randNum", x);

        PrintWriter out = response.getWriter();
        out.println("<html>" +
                "<head>" +
                    "<title>Guess Number Game</title>" +
                "</head>" +
                "<body>" +
                    "Enter the number between 1 and 10"+
                    "<form method=POST action=guessnumber>" +
                        "<input type=number name=number />" +
                        "<input type=SUBMIT value=Enter />" +
                    "</form>"+
                "</body></html>");
        System.out.println(x);
    }
}

------------------------------------------------------------------------------------------------------------
Web.xml
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<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
    <servlet>
        <servlet-name>HelloServlet</servlet-name>
        <servlet-class>HelloServlet</servlet-class>
    </servlet>
</web-app>

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