The totality of CSE: Invoking servlets from HTML forms

Question - "To invoke servlets from HTML forms".

To work on this program, I recommend you to download Netbeans IDE.

You can download Netbeans IDE from the following link,

http://netbeans.org/downloads/

After you download and install perform the following procedure,

Procedure to run this program on Netbeans

Start Netbeans IDE.
Now Select File->New Project.
In the New Project Dialog box that appears select Java Web(Web Application).
Now “New Web Application” Dialog box appears.
Give the Project Name as “ServletApplication”.
Click Next twice and then Finish.
Now a web application named ServletApplication is created with a default page “index.jsp”. There write the code for HTML forms.
Then right click on the WEB-INF folder and select New-> Servlet. Give the name of the servlet as “MyServlet” , click Next. In the next dialog that appears please make sure “Add information to deployment descriptor” checkbox is selected. Now click next and then finish.
Write the code for Servlet in it.
To compile the file, right click on index.jsp and then select “compile file”.
After compiling, again right click on index.jsp and select “Run file”.
Now the browser(use firefox) will open and verify the output.

Download the Source code

Code

index.jsp

<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<html>
    <head><title>HTML Forms and Servlet</title></head>
    <body>
        <%-- <jsp:useBean id="beanInstanceName" scope="session" class="beanPackage.BeanClassName" /> --%>
        <%-- <jsp:getProperty name="beanInstanceName" property="propertyName" /> --%>
        <h1>Enter your Details</h1>
        <form action = "MyServlet">
        <table>
        <tr>
        <td>Name
        <td><input type="text" name="name"><br><br>
        </tr>
        <tr>
        <td>Reg No
        <td><input type="text" name="reg"><br><br>
        </tr>
        <tr>
        <td>Sub1 Mark
        <td><input type="text" name="sub1"><br><br>
        </tr>
        <tr>
        <td>Sub2 Mark
        <td><input type="text" name="sub2"><br><br>
        </tr>
        <tr>
        <td>Sub3 Mark
        <td><input type="text" name="sub3"><br><br>
        </tr>
        <tr>
        <td>Sub4 Mark
        <td><input type="text" name="sub4"><br><br>
        </tr>
        <tr>
        <td>Sub5 Mark
        <td><input type="text" name="sub5"><br><br>
        </tr>
        <tr>
        <td>Sub6 Mark
        <td><input type="text" name="sub6"><br><br>
        </tr>
        </table>
        <input type="submit">
        </form>
    </body>
</html>

MyServlet.java

/*
* MyServlet.java
*
* Created on February 3, 2011, 9:03 PM
*/
import java.io.*;
import java.net.*;
import javax.servlet.*;
import javax.servlet.http.*;
/**
*
* @author Administrator
* @version
*/
public class MyServlet extends HttpServlet {
    /** Initializes the servlet.
     */
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
    }

    /** Destroys the servlet.
     */
    public void destroy() {

    }
      public String display(int mark)
    {
        if(mark>90 && mark<=100)
    {
    return "S";
    }
    else if(mark>80 && mark<=90)
    {
    return("A");
    }
    else if(mark>70 && mark<=80)
    {
    return("B");
    }
    else if(mark>60 && mark<=70)
    {
    return("C");
    }
    else if(mark>55 && mark<=60)
    {
    return("D");
    }
    else if(mark>=50 && mark<55)
    {
    return("E");
    }
    else
    {
    return("Re Appear");
    }
    }
    /** Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     */

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();

        try {
            String name, reg;
            int mark,s1,s2,s3,s4,s5,s6;
name = request.getParameter("name");
reg = request.getParameter("reg");
s1 = Integer.parseInt(request.getParameter("sub1"));
s2 = Integer.parseInt(request.getParameter("sub2"));
s3 = Integer.parseInt(request.getParameter("sub3"));
s4 = Integer.parseInt(request.getParameter("sub4"));
s5 = Integer.parseInt(request.getParameter("sub5"));
s6 = Integer.parseInt(request.getParameter("sub6"));

response.setContentType("text/html");

out.println("<html>");
out.println("<head>");
out.println("<title>Mark Report Servlet<title>");
out.println("</head>");

out.println("<body>");
out.println("<center><p><h2><b>Name :" + name + "</p>");
out.println("<p><b>Reg No :" + reg + "</p>");
out.println("<p><b>Your Mark Details</p><br><br></center>");
out.println("<center><table border=2 cellpadding=5 cellspacing=5>");
out.println("<tr><th>Subjects</th><th>Mark</th><th>Grade</th></tr>");
out.println("<tr><th>Sub1</th><td>"+s1 + "</td><td>" + display(s1) + "</td></tr>");
out.println("<tr><th>Sub2</th><td>"+s2 + "</td><td>" + display(s2) + "</td></tr>");
out.println("<tr><th>Sub3</th><td>"+s3 + "</td><td>" + display(s3) + "</td></tr>");
out.println("<tr><th>Sub4</th><td>"+s4 + "</td><td>" + display(s4) + "</td></tr>");
out.println("<tr><th>Sub5</th><td>"+s5 + "</td><td>" + display(s5) + "</td></tr>");
out.println("<tr><th>Sub6</th><td>"+s6 + "</td><td>" + display(s6) + "</td></tr></table>");
out.println("</body>");
out.println("</html>");
        } finally {
            out.close();
        }

    }

    /** Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }
    /** Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }
    /** Returns a short description of the servlet.
     */
    public String getServletInfo() {
        return "Short description";
    }

Note

Some parts of the code will be automatically generated by Netbeans itself. So you need not worry.

Screenshots

The totality of CSE

Monday, February 7, 2011

Invoking servlets from HTML forms

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