Dr. Milan Vachhani: Programming Skills

Write a Servlet to display all the headers available from request

//----------
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;

public class requestheader extends HttpServlet
{
public void doGet(HttpServletRequest req,HttpServletResponse res) throws   ServletException,IOException
{
res.setContentType("text/html");
PrintWriter out= res.getWriter();
out.println("<HTML>\n" +" <head> <title> TABLE OF REQUEST HEADERS</title></head>\n"
                    + "<body> <h1> TABLE OF REQUEST HEADERS</h1><b>REQUEST METHOD : </b>"+req.getMethod()
                      +"<b>REQUEST URI :</B>" + req.getRequestURI()
                      + " <b> REQUEST PROTOCOL </B> "+ req.getProtocol()
                     +"<table border=1 align=\*CENTER\*> \n <tr> <th>HEADER NAME </th><th> HEADER VALUE </th>");
Enumeration headers =req.getHeaderNames();
while(headers.hasMoreElements())
{
String headnam = (String)headers.nextElement();
out.prinln("<tr><td>" + headers);
out.println("<TR><TD>" + req.getHeader(headnam));
}
}
}

Write a Servlet to display parameters available on request.

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

public class paramvalue extends HttpServlet
{
public void doGet(HttpServletRequest req,HttpServletResponse res) extends ServetException,IOException
{
res.setContentType("text/html");
PrintWriter out=res.getWriter();
String title="Reading All Request parameters";
Enumeration params =req.getParametersNames();
while(params.hasMoreElements())
{
 String pnam = (String)params.nextElement();
 out.prinln("<tr><td>" + pnam);
 out.println("<TR><TD>" + req.getParameter(pnam));
}
}
}

Write a Servlet to display all the attributes available from request and context.

//----------
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class ShowRequestAndSessionAttributes extends HttpServlet
{
public void doGet(HttpServletRequest req,HttpServletResponse res)
throws IOException,ServletException{

 res.setContentType("text/html");
 PrintWriter out=res.getWriter();
 out.println("<hrml><body><br><br>");


 //Request Attributes....
 req.setAttribute("name","Rakesh");
 req.setAttribute("course","MCA");
 req.setAttribute("collage","LD Engineering");

 Enumeration nameOfAttrib=req.getAttributeNames();
 out.println("<table border='1'><tr><th colspan=2>List of all request Attributes</th></tr>");
 out.println("<tr><td>Attribute Name</td><td>Attribute Value</td></tr>");

 String attribName;
 while(nameOfAttrib.hasMoreElements())
 {
     attribName=(String)nameOfAttrib.nextElement();
     out.println("<tr><td>"+attribName+"</td><td>");
     Object obj=req.getAttribute(attribName);
     out.println(""+obj+"</td><tr>");
 }
 out.println("</table>");


 //Context attributes..
 ServletContext con=getServletContext();

 con.setAttribute("Enrollement Number","095160693024");
 con.setAttribute("Seat Number","c-456464");


 out.println("<br><br>");
 Enumeration contextAttrib=con.getAttributeNames();
 out.println("<table border='1'><tr><th colspan=2>List of all Session Attributes</th></tr>");
 out.println("<tr><td>Attribute Name</td><td>Attribute Value</td></tr>");

 while(contextAttrib.hasMoreElements())
 {
     attribName=(String)contextAttrib.nextElement();
     out.println("<tr><td>"+attribName+"</td><td>");
     Object obj=con.getAttribute(attribName);
     out.println(""+obj+"</td><tr>");
 }
 out.println("</table>");
 out.println("</body></html>");
}

public void doPost(HttpServletRequest req,HttpServletResponse res)
 throws IOException,ServletException{
     doGet(req,res);
}
}

Write a Servlet which displays a message and also displays how many times the message has been displayed (how many times the page has been visited).

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

public class accesscounter extends HttpServlet
{
public void doGet(HttpServletRequest req,HttpServletResponse res) throws  ServletException,IOException
{
String count=CookieUtilities.getCookieValue(req,"AccessCount","1");
int count=1;
try
{
 count=Integer.parseInt(countString);
}
catch(NumberFormatException nfe)
{}
LongLiveCookie c=new LongLiveCookie("accessCount",String.valueOf(count+1));
res.addCookie(c);
res.setContentType("text/html");
printWriter out=res.getWriter();
String title="Access Count Servlet";
out.println("<html> \n" + "<head> <title> message </title> </head>\n" + "<h2>This is visit  number "+ count + "by this browser.</h2>\n" + "</html>");
}
}

Assume that we have got three pdf files for the MCA-1 Syllabus, MCA-2 Syllabus and MCA-3 Syllabus respectively, Now write a Servlet which displays the appropriate PDF file to the client, by looking at a request parameter for the year (1, 2 or 3).

//----------
Html file
------------
<html>
<head>
<title>Untitled Document</title>
</head>
<body>
<form action="http://localhost:8080/GTU/Ex15" method="get">
<table>
<tr>
 <th>Select semester to download syllabus</th>
</tr>
<tr>
 <td>
     <select name="sem">
         <option value="Semester1">Semester1</option>
         <option value="Semester2">Semester2</option>
         <option value="Semester3">Semester3</option>
     </select>
 </td>
</tr>
<tr>
 <td><input type="submit" value="Download"></td>
</tr>
</table>
</form>
</body>
</html>

Servlet File ::
---------------

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

public class Ex15 extends HttpServlet {
public void doGet(HttpServletRequest req,
         HttpServletResponse res)
throws ServletException, IOException {
 res.setContentType("text/html");
 PrintWriter out = res.getWriter();
 out.println("<body><br><br><br><table border=1 align='center'>");

 String[] paramValues = req.getParameterValues("sem");
 String semValue=paramValues[0];
 if(semValue.equals("Semester1"))
 {
     res.sendRedirect("http://gtu.ac.in/syllabus/MCA/MCA%20SEM-1,2%20DETAILED%20SCHEME_SYLLABUS.zip");
 }
 else if(semValue.equals("Semester2"))
 {
     res.sendRedirect("http://gtu.ac.in/syllabus/MCA/MCA%20SEM-1,2%20DETAILED%20SCHEME_SYLLABUS.zip");
 }
 else if(semValue.equals("Semester3"))
 {
     res.sendRedirect("http://gtu.ac.in/syllabus/MCA/MCA_SEM_-_III_&_SEM_IV_Syllabus.zip");
 }
 else
 {
     out.println("Some problem in redirecting the page");
     //out.println(semValue);
 }
 out.println("</table></body></html>");
}

}

Assume that the information regarding the marks for all the subjects of a student in the last exam are available in a database, Develop a Servlet which takes the enrollment number of a student as a request parameter and displays the marksheet for the student.

//----------
HTML FILE ::
------------

<html>
<head>
<title>Untitled Document</title>
</head>
<script language="javascript">
function validate()
{
//alert(document.getElementById(1).value);
if(document.getElementById(1).value=="")
{
alert("Pleas enter enrollment number");
return false;
}
return true;
}
</script>
<body>
<table width="20%">
<form action="http://localhost:8080/GTU/Ex16" method="get" onSubmit="return validate();">
<tr>
<td>Enter Enrollment Number</td>
</tr>
<tr>
<td><input type="text" name="enum" id=1></td>
</tr>
<tr>
<td><input type="submit"></td>
</tr>
</form>
</table>
</body>
</html>

Servlet File…
-------------

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

public class Ex16 extends HttpServlet{
public void doGet(HttpServletRequest req,HttpServletResponse res)
throws ServletException,IOException{

res.setContentType("text/html");
PrintWriter out=res.getWriter();
out.println("<html><body>");
String eNum=req.getParameter("enum");
/*out.println("<h2>"+eNum+"</h2>");
String myQuery="SELECT* FROM stud";
out.println("<h2>"+myQuery+"</h2>");
*/
try
{
 Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
 Connection con = DriverManager.getConnection("JDBC:ODBC:DATASOURCE");  
 Statement s=con.createStatement();
 s.executeQuery("Select * from result where EnrollNum='"+eNum+"'");
 ResultSet rs=s.getResultSet();
 rs.next();
 if(rs!=null)
 {

         out.println("<table border=1>");
         out.println("<tr><td>Roll No</td><td>"+rs.getString(2)+"</td></tr>");
         out.println("<tr><td>Name</td><td>"+rs.getString(3)+"</td></tr>");
         out.println("<tr><td>Subject1</td><td>"+rs.getString(4)+"</td></tr>");
         out.println("<tr><td> Subject2</td><td>"+rs.getString(5)+"</td></tr>");
         out.println("<tr><td> Subject3</td><td>"+rs.getString(6)+"</td></tr>");
         out.println("<tr><td> Subject4</td><td>"+rs.getString(7)+"</td></tr>");
         out.println("<tr><td>spi</td><td>"+rs.getString(8)+"</td></tr>");
         out.println("</table>");
 }
 out.println("</body></html>");
}catch (Exception err) {
         System.out.println( "Error: " + err );
}
}
}

Devlop A Servlet to which looks for cookies for username and Password, and forword to a home.jsp in case the cookies are valid and forword to a login.jsp in case the cookies are not found or the cookies are not valid.

//----------
Servlet ::
----------

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

class authorised extends HttpServlet
{
public void doPost(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException
{
int cnt=0;
String userid="cuid";
String password="cpwd";
String uid=req.getParameter("txtuid");
String pwd=req.getParameter("txtpwd");
Cookie[] cookies=req.getCookies();
if(cookies != null)
{
 for(int i=0;i<cookies.length;i++)
 {
     if((userid.equals(cookies[i].getName())) &&(uid.equals(cookies[i].getValue())))
     {
         cnt++;
     }
     if((password.equals(cookies[i].getName())) &&(pwd.equals(cookies[i].getValue())))
     {
         cnt++;
     }
 }
 if(cnt==2)
 {
 res.sendRedirect("http://localhost:8080/wtad/jspfiles/home.jsp");
 }
 else
 {
     Cookie uidc=new Cookie(userid,uid);
     Cookie pwdc=new Cookie(password,pwd);

     res.addCookie(uidc);
     res.addCookie(pwdc);
 res.sendRedirect("http://localhost:8080/wtad/jspfiles/login.jsp");
 }
}
}
}

HOME.JSP ::
-----------

<html>
<head>
<title>Hello WElcome to the Home page</title>
</head>
<body>
Hello WElcome to the Home page
</body>
</html>

LOGIN.JSP  ::
-------------

<!-- login file for session tracting program 18 -->
<html>
<head>
<title>
 login page
</title>
</head>
<body>
<form name="frmlogin"action="http://localhost:8080/wtad/authorised" method="post"
<center><B>User Id :: </B> <input type="text" name="txtid"><br>
<B>PassWord :: </B><input type="password" nam="txtpwd"><br>
 <input type="submit" name="cmdsend" value="Log In">

 <input type="reset" name="cmdclear" value="Clear"></center>
</form>
</body>
</html>

Devlop a Servlet to authenticate a user,where the login id and password are available as request parameter.In case the authentication is successful,it should setup a new session and store the user’s information in the session before forwarding to home.jsp, which displays a user informations.

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

class authoriseds extends HttpServlet
{
public void doPost(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException
{
int cnt=0;
String userid="suid";
String password="spwd";
String uid=req.getParameter("txtuid");
String pwd=req.getParameter("txtpwd");
HttpSession session = request.getSession(true);
if(uid.equals(session.getValue(userid)) && pwd.equals(session.getValue(password)))
{
 res.sendRedirect("http://localhost:8080/wtad/jspfiles/home.jsp");
}
else
{
 session.addValue(userid,uid);
 session.addValue(password,pwd);
 res.sendRedirect("http://localhost:8080/wtad/jspfiles/login.jsp");
}
}
}

Write a simple JSP pages to display a simple message.

//----------
<html>
<head>
<title> JSP PAGE WITH DISPLAY HELLO WORLD</title>
</head>
<body>
<%! String msg="Hello World..."; %>
<center><h3 color="pink"> <%= msg %> </h3>
</body>
</html>

Write A JSP Page, which uses the include directive to show its header and footer

//----------
<!-- Write A JSP Page, which uses the include directive to show its header and footer -->

<html>
<head>
<title>  </title>
</head>
<body>
<table border="1" align="center" cellpadding="0" cellspacing="0">
 <tr>
     <td align="center" id="header">
         <%@ include file="header.jsp" %>
     </td>
 </tr>
 <tr height="500">
     <td>

     </td>

 </tr>

 <tr>
     <td align="right" id="footer">
         <%@ include file="footer.jsp" %>
     </td>
 </tr>
</table>
</body>
</html>
HEADER.JSP ::
<html>
<head>
<title>
 Header Page for Applictaion
</title>
</head>
<body>
<table>
 <tr>
     <td colspan=4> Appication Names </td>
 </tr>
 <tr>
     <td>link1</td>
     <td>link2</td>
     <td>link3</td>
     <td>link4</td>
 </tr>
</table>
</body>
</html>
FOOTER.JSP ::
<html>
<body>
<table align="right" cellpadding="0" cellspacing="5" border="0">
<tr align="right">
<td>link1 | </td>
<td>link2 | </td>
<td>link3 | </td>
<td>link4 | </td>
</tr>
<tr align="right">
     <td align="left" colspan="2"> Site Visited : </td>
     <td colspan="8">© 2000-2011 Application</td>
</tr></table>
</body>
</html>

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Prepared By:

Student of B. H. Gardi College of Eng. & Tech., MCA Department

(Nisarg Juthani, Kajal Savjani, Desai Paresh, Ramoliya Nilesh, Thanki Ravi.....)

Dr. Milan Vachhani

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Sunday, May 8, 2011

Programming Skills – VII (WTAD) 640012 p2

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