Dunno how to write JSP for login in......

Question

Can someone help mi on write JSP coding for login in page?i dun really know how how to write JSP coding. i m now doing a project on Private Driving instructor portal where people can register as trainee or instructor.now i want to write the JSP coding on the login page part.... when instuctor login it will go to a instructor's main page n if a trainee login it will go to a trainee's main page.Can someone help mi on this??? it's very urgent n important for mi.Please help mi.

Answer 1

The easiest method I have found is to use a database to store the users details along with a flag indicating whether they are a trainee or an instructor. Upon logging in, you can use a bean to connect to the database and retrieve these values, then it is a simple matter of a jsp:forward tag to re-direct to the applicable page for trainee or instructor ...
e.g.
<pre>
***JSP PAGE ***
<%@page language="java" buffer="32kb" import="jspclasses.customer.*" errorPage="./error.jsp"%>
<jsp:useBean id="userBean" class="jspclasses.userInfoBean" scope="session"/>
* Get user and pass from form variables. (if passed)*
String user = request.getParameter("username");
String pass = request.getParameter("password");
* Retrieve fullname from session object. (if exists)*
fullname = (String)session.getValue("fullname");
String fwdPage = (String)session.getValue("fwdPage");
if (fullname==null) {
     try {
     * If no session has been established then attempt to create one using *
     * the values passed through via form. If no values have been passed *
     * through then variables will equal null as opposed to empty strings. *
     * If null is evident, catch with NullPointerException. *
          if (user.equals("") || pass.equals("")) {
               fullname = "Not";
          } else {
               * Send values to method which validates users *
               userBean.setUserInfo(user,pass);
               * If an error was encountered within userBean the error *
               * instance variable will != null. *
               if (userBean.error == "") {
                    fullname = userBean.getFullname();
               } else {
                    * Error was encountered so we set fullname to "Not", if *
                    * user was entered we re-display value and we instantiate *
                    * error variable to error value of userBean. *
                    fullname = "Not";
                    if (user!=null) uservalue=user;
                    error = userBean.error;
                    //out.println("Error is not null:<br>"+error+"<br>");
               if (fullname!="Not") {
                    session = request.getSession(true);
                    session.putValue("fullname",fullname);
                    session.putValue("email",user);
                    session.putValue("user_id",userBean.getUserId());
                    session.putValue("user_type",userBean.getUserType());
                    session.putValue("sessionid",session.getId());
                    session.setMaxInactiveInterval(12000);
***END JSP***
*** START BEAN ***
public void setUserInfo(String user, String pass) {
String stmtString = "";
ResultSet rs = null;
// Check to see if a valid connection is available
getConnection();
// If getConnection returns null then
// connection successfully established
if (error.equals("")) {
try {
// Create SQL string to be sent to database
stmtString = "select * from serv_user where email = '" + user + "' and password = '" + pass + "'";
// Execute SQL
rs = stmt.executeQuery(stmtString);
// Specify estimated rows to be returned
rs.setFetchSize(1);
// If a row is returned get first and last name
if (rs.next()) {
user_id = ((rs.getString("USER_ID")!=null)?rs.getString("USER_ID"):"");
("USER_TYPE_ID"):"");
first_name = ((rs.getString("FIRST_NAME")!=null)?rs.getString("FIRST_NAME"):"");
last_name = ((rs.getString("LAST_NAME")!=null)?rs.getString("LAST_NAME"):"");
business = ((rs.getString("BUSINESS_NAME")!=null)?rs.getString("BUSINESS_NAME"):"");
address = ((rs.getString("ADDRESS")!=null)?rs.getString("ADDRESS"):"");
suburb = ((rs.getString("SUBURB")!=null)?rs.getString("SUBURB"):"");
state = ((rs.getString("STATE")!=null)?rs.getString("STATE"):"");
postcode = ((rs.getString("POSTCODE")!=null)?rs.getString("POSTCODE"):"");
hom_phone = ((rs.getString("HOM_PHONE")!=null)?rs.getString("HOM_PHONE"):"");
bus_phone = ((rs.getString("BUS_PHONE")!=null)?rs.getString("BUS_PHONE"):"");
mob_phone = ((rs.getString("MOB_PHONE")!=null)?rs.getString("MOB_PHONE"):"");
fax = ((rs.getString("FAX")!=null)?rs.getString("FAX"):"");
email = ((rs.getString("EMAIL")!=null)?rs.getString("EMAIL"):"");
pass_hint = ((rs.getString("PASSWORD_HINT")!=null)?rs.getString("PASSWORD_HINT"):"");
else {
error = "User <b>"+user+"</b> does not exist with specified password.<br>Please try again.";
} // END : ResultSet = true
} // END : TRY
catch (SQLException sqle) {
error = "<b>Error accessing database:</b><br> "+sqle.toString()+" - ORA:"+sqle.getErrorCode();
catch (Exception e) {
error = "<b>Error occurred in method setUserInfo()</b><br> "+e.getMessage();
} // END : CATCH
finally{
closeConnection();
try{
rs.close();
}catch(SQLException sqle){
} // END : IF
} // END : METHOD
} // END : BEAN
***END BEAN***