CodingForums.com - Processing form's element(s) in JSP

I have a HTML form in JSP page, and in the <header> I have a JavaScript validation. The user must enter one field: name or id or year, and a java file will search the student in database by name or by id or by year. The JavaScript alerts when no field is filled and performs the **action** if one field is filled.

Code:

<html><head>.....</head>

        <body bgcolor=#ADD8E6><center>

                        

        <form action="FoundStudents.jsp" method="post" name="entry2" onSubmit="return validateSea()">

         <input type="hidden" value="list" name="seek_stud">

...........................................................................................

The problem is I want to process the parameter which I receive in FoundStudents.jsp: If I get the year, I look in DB which student(s) are in that year and display all that student(s)' data(do that in a java file). How could I do that in FoundStudents.Jsp without checking again which field is filled(I've done that in JavaScript from **SearchStudent.jsp**). I mean the FoundStudents.jsp calls a method in the java file for searching and displaying.

I tried by now with the **input hidden** that worked, but that is for more forms. I have only 1.

**FoundStudent.jsp**

Code:

 <%@page import="stud.diploma.students.StudentsManager"%>

    <%@page import="stud.diploma.students.Student"%>

    <%@page import="java.util.ArrayList"%>

    <%@page import="stud.diploma.database.ConnectionsManager"%>

    

    <%@ page language="java" import="java.sql.*, java.lang.*" %>

    

    <%

    Student search = null;

     if(request.getParameter("seek_stud") != null){

                           

                    //reading params from the SearchStudent form

                    String name = request.getParameter("name");

                    String year_prime = request.getParameter("year");

            int year, id;

                     

                    try{

                            year = Integer.parseInt(year_prime);

                    }catch(Exception e1){

                            year = 0; 

                    }

                    

                String id_prime = request.getParameter("id");

                try{

                        id = Integer.parseInt("id");

                }catch(Exception e2){

                        id = 0;

                }

                

                

                if(name.length() != 0){

                    search = StudentsManager.getInstance().studByName(name);

                }

                

                if(year > 0){

                   search = StudentsManager.getInstance().studByYear(year);

                              }

                

                if(id > 0){

                   search = StudentsManager.getInstance().studById(id);

                }    

     

                if(search != null){

    %>

    

    <html>

                    <body bgcolor=#4AA02C>

                    <center>

                            <h2>Student's data</h2>

                            <table border="1" cellspacing="1" cellpadding="8" bgcolor= #EBDDE2> 

                            <tr>

                                    <td bgcolor= #FF9966><b>ID</b></td>

                                    <td bgcolor= #FF9966><b>Name</b></td>

                                    <td bgcolor= #FF9966><b>Year</b></td>

                            </tr>

                                 <tr>

                                      <td><%= search.getId()%></td>

                                      <td><%= search.getName()%></td>

                                      <td><%= search.getYear()%></td>

                                    </tr>

                            </table>

                            </center>

                    </body>

            </html>

    <%}else{%>

            

    <%

    String redirectURL = "MainMenu.html";

    response.sendRedirect(redirectURL);

    %>

    

         <%}%>

    <%}%>

This **FoundStudent.jsp** is for the version of multiple forms (using hidden input) that worked. (the javascript test was just a little bit different, I typed it insted of what I had in the beginning)

It searched by name and by year only. Didn't search by ID (I had exception here `

Code:

<td><%= search.getId()%></td>

` I'm still trying to see how to deal with it. ID is a AUTO_INCREMENT PRIMARY KEY)

Lines like : search = StudentsManager.getInstance().studByName(name);
**Search** is a Student type object. (Object Student is creaded in a java file)

**StudentsManager** is a java class that receives calls to it's methods from JSP. getInstance() creates an instance of StudentsManager. Method **studByName(name)** receives the parameter **name** from the form and searches it in the database.