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POjava: retaining values in a form after forward
 

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    <p>I have a jsp page <code>GetEmpDetails.jsp</code> and a servlet class <code>ShowEmpDetails.java</code>.</p> <p>My doubt is when request goes to servlet and servlet class do all validation(<code>at present i did validation only for firstname and last name</code>).if let's say <code>firstname</code> field is left blank then i display a message besides that particular field in jsp(i used <code>forward</code> to forward back to the same <code>GetEmp</code> form). but with that i also want the details entered by the user to stay in that form.. Could you please guide me how i will write the code in servlet as well as jsp page.</p> <p>My Servlet: </p> <pre><code>package com.fulcrum.EmpForm; import java.io.IOException; import java.util.ArrayList; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import com.sun.xml.internal.ws.developer.MemberSubmissionAddressing.Validation; public class ShowEmpDetails extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String fname = request.getParameter("fname"); request.setAttribute("fname", fname); String lname = request.getParameter("lname"); String gender = request.getParameter("gender"); String age = request.getParameter("age"); String email = request.getParameter("email"); String password = request.getParameter("pwd"); int date = Integer.parseInt(request.getParameter("date")); int month = Integer.parseInt(request.getParameter("month")); int year = Integer.parseInt(request.getParameter("year")); if (fname == "") { String message1 = "OOps!!! required field fname"; request.setAttribute("message1", message1); // get back to login.jsp page using forward } if (lname == "") { String message2 = "OOps!!! required field lname"; request.setAttribute("message2", message2); } request.getRequestDispatcher("/GetEmpDetails.jsp").forward(request, response); return; } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } } </code></pre> <p>My Jsp:</p> <pre><code>&lt;%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%&gt; &lt;!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"&gt; &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"&gt; &lt;title&gt;Employee Form&lt;/title&gt; &lt;/head&gt; &lt;body bgcolor="turquoise"&gt; &lt;h1&gt;Employee Details Form&lt;/h1&gt; &lt;!-- action send the form data to servlet named 'ShowEmpDetails'. --&gt; &lt;form name="empDetails" action="ShowEmpDetails"&gt; First Name:&lt;input type="text" name="fname"&gt; &lt;% if (request.getAttribute("message1") == null) { out.println(""); } else { out.println(request.getAttribute("message1")); } %&gt;&lt;br&gt; &lt;br&gt; Last Name:&lt;input type="text" name="lname"&gt; &lt;% if (request.getAttribute("message2") == null) { out.println(""); } else { out.println(request.getAttribute("message2")); out.println(request.getAttribute("fname")); } %&gt;&lt;br&gt; &lt;br&gt; Email:&lt;input type="text" name="email"&gt;&lt;br&gt; &lt;br&gt; password: &lt;input type="password" name="pwd"&gt;&lt;br&gt; &lt;br&gt; Age:&lt;input type="text" name="age"&gt;&lt;br&gt; &lt;br&gt; &lt;!-- 'select-option' to create a combo-box named Date. --&gt; Date of birth: &amp;nbsp; Date: &lt;select name="date"&gt; &lt;option value="1"&gt;1&lt;/option&gt; &lt;option value="2"&gt;2 &lt;option value="3"&gt;3 &lt;option value="4"&gt;4 &lt;option value="5"&gt;5 &lt;option value="6"&gt;6 &lt;option value="7"&gt;7 &lt;option value="8"&gt;8 &lt;option value="9"&gt;9 &lt;option value="10"&gt;10 &lt;option value="11"&gt;11 &lt;option value="12"&gt;12 &lt;option value="13"&gt;13 &lt;option value="14"&gt;14 &lt;option value="15"&gt;15 &lt;option value="16"&gt;16 &lt;option value="17"&gt;17 &lt;option value="18"&gt;18 &lt;option value="19"&gt;19 &lt;option value="20"&gt;20 &lt;option value="21"&gt;21 &lt;option value="22"&gt;22 &lt;option value="23"&gt;23 &lt;option value="24"&gt;24 &lt;option value="25"&gt;25 &lt;option value="26"&gt;26 &lt;option value="27"&gt;27 &lt;option value="28"&gt;28 &lt;option value="29"&gt;29 &lt;option value="30"&gt;30 &lt;option value="31"&gt;31 &lt;/select&gt; &lt;!-- 'select-option' to create a combo-box named month. --&gt; Month: &lt;select name="month"&gt; &lt;option value="1"&gt;January &lt;option value="2"&gt;February &lt;option value="3"&gt;March &lt;option value="4"&gt;April &lt;option value="5"&gt;May &lt;option value="6"&gt;June &lt;option value="7"&gt;July &lt;option value="8"&gt;August &lt;option value="9"&gt;September &lt;option value="10"&gt;October &lt;option value="11"&gt;November &lt;option value="12"&gt;December &lt;/select&gt; &lt;!-- 'select-option' to create a combo-box named month. --&gt; Year: &lt;select name="year"&gt; &lt;option value="2012"&gt;2012&lt;/option&gt; &lt;option value="2011"&gt;2011&lt;/option&gt; &lt;option value="2010"&gt;2010&lt;/option&gt; &lt;option value="2009"&gt;2009&lt;/option&gt; &lt;option value="2008"&gt;2008&lt;/option&gt; &lt;option value="2007"&gt;2007&lt;/option&gt; &lt;option value="2006"&gt;2006&lt;/option&gt; &lt;option value="2005"&gt;2005&lt;/option&gt; &lt;option value="2004"&gt;2004&lt;/option&gt; &lt;option value="2003"&gt;2003&lt;/option&gt; &lt;option value="2002"&gt;2002&lt;/option&gt; &lt;option value="2001"&gt;2001&lt;/option&gt; &lt;option value="2000"&gt;2000&lt;/option&gt; &lt;option value="1999"&gt;1999&lt;/option&gt; &lt;option value="1998"&gt;1998&lt;/option&gt; &lt;option value="1997"&gt;1997&lt;/option&gt; &lt;option value="1996"&gt;1996&lt;/option&gt; &lt;option value="1995"&gt;1995&lt;/option&gt; &lt;option value="1994"&gt;1994&lt;/option&gt; &lt;option value="1993"&gt;1993&lt;/option&gt; &lt;option value="1992"&gt;1992&lt;/option&gt; &lt;option value="1991"&gt;1991&lt;/option&gt; &lt;option value="1990"&gt;1990&lt;/option&gt; &lt;option value="1989"&gt;1989&lt;/option&gt; &lt;option value="1988"&gt;1988&lt;/option&gt; &lt;option value="1987"&gt;1987&lt;/option&gt; &lt;option value="1986"&gt;1986&lt;/option&gt; &lt;option value="1985"&gt;1985&lt;/option&gt; &lt;option value="1984"&gt;1984&lt;/option&gt; &lt;option value="1983"&gt;1983&lt;/option&gt; &lt;option value="1982"&gt;1982&lt;/option&gt; &lt;option value="1981"&gt;1981&lt;/option&gt; &lt;option value="1980"&gt;1980&lt;/option&gt; &lt;option value="1979"&gt;1979&lt;/option&gt; &lt;option value="1978"&gt;1978&lt;/option&gt; &lt;option value="1977"&gt;1977&lt;/option&gt; &lt;option value="1976"&gt;1976&lt;/option&gt; &lt;option value="1975"&gt;1975&lt;/option&gt; &lt;option value="1974"&gt;1974&lt;/option&gt; &lt;option value="1973"&gt;1973&lt;/option&gt; &lt;option value="1972"&gt;1972&lt;/option&gt; &lt;option value="1971"&gt;1971&lt;/option&gt; &lt;option value="1970"&gt;1970&lt;/option&gt; &lt;option value="1969"&gt;1969&lt;/option&gt; &lt;option value="1968"&gt;1968&lt;/option&gt; &lt;option value="1967"&gt;1967&lt;/option&gt; &lt;option value="1966"&gt;1966&lt;/option&gt; &lt;option value="1965"&gt;1965&lt;/option&gt; &lt;option value="1964"&gt;1964&lt;/option&gt; &lt;option value="1963"&gt;1963&lt;/option&gt; &lt;option value="1962"&gt;1962&lt;/option&gt; &lt;option value="1961"&gt;1961&lt;/option&gt; &lt;option value="1960"&gt;1960&lt;/option&gt; &lt;option value="1959"&gt;1959&lt;/option&gt; &lt;option value="1958"&gt;1958&lt;/option&gt; &lt;option value="1957"&gt;1957&lt;/option&gt; &lt;option value="1956"&gt;1956&lt;/option&gt; &lt;option value="1955"&gt;1955&lt;/option&gt; &lt;option value="1954"&gt;1954&lt;/option&gt; &lt;option value="1953"&gt;1953&lt;/option&gt; &lt;option value="1952"&gt;1952&lt;/option&gt; &lt;option value="1951"&gt;1951&lt;/option&gt; &lt;option value="1950"&gt;1950&lt;/option&gt; &lt;option value="1949"&gt;1949&lt;/option&gt; &lt;option value="1948"&gt;1948&lt;/option&gt; &lt;option value="1947"&gt;1947&lt;/option&gt; &lt;option value="1946"&gt;1946&lt;/option&gt; &lt;option value="1945"&gt;1945&lt;/option&gt; &lt;option value="1944"&gt;1944&lt;/option&gt; &lt;option value="1943"&gt;1943&lt;/option&gt; &lt;option value="1942"&gt;1942&lt;/option&gt; &lt;option value="1941"&gt;1941&lt;/option&gt; &lt;option value="1940"&gt;1940&lt;/option&gt; &lt;option value="1939"&gt;1939&lt;/option&gt; &lt;option value="1938"&gt;1938&lt;/option&gt; &lt;option value="1937"&gt;1937&lt;/option&gt; &lt;option value="1936"&gt;1936&lt;/option&gt; &lt;option value="1935"&gt;1935&lt;/option&gt; &lt;option value="1934"&gt;1934&lt;/option&gt; &lt;option value="1933"&gt;1933&lt;/option&gt; &lt;option value="1932"&gt;1932&lt;/option&gt; &lt;option value="1931"&gt;1931&lt;/option&gt; &lt;option value="1930"&gt;1930&lt;/option&gt; &lt;option value="1929"&gt;1929&lt;/option&gt; &lt;option value="1928"&gt;1928&lt;/option&gt; &lt;option value="1927"&gt;1927&lt;/option&gt; &lt;option value="1926"&gt;1926&lt;/option&gt; &lt;option value="1925"&gt;1925&lt;/option&gt; &lt;option value="1924"&gt;1924&lt;/option&gt; &lt;option value="1923"&gt;1923&lt;/option&gt; &lt;option value="1922"&gt;1922&lt;/option&gt; &lt;option value="1921"&gt;1921&lt;/option&gt; &lt;option value="1920"&gt;1920&lt;/option&gt; &lt;option value="1919"&gt;1919&lt;/option&gt; &lt;option value="1918"&gt;1918&lt;/option&gt; &lt;option value="1917"&gt;1917&lt;/option&gt; &lt;option value="1916"&gt;1916&lt;/option&gt; &lt;option value="1915"&gt;1915&lt;/option&gt; &lt;option value="1914"&gt;1914&lt;/option&gt; &lt;option value="1913"&gt;1913&lt;/option&gt; &lt;option value="1912"&gt;1912&lt;/option&gt; &lt;option value="1911"&gt;1911&lt;/option&gt; &lt;option value="1910"&gt;1910&lt;/option&gt; &lt;option value="1909"&gt;1909&lt;/option&gt; &lt;option value="1908"&gt;1908&lt;/option&gt; &lt;option value="1907"&gt;1907&lt;/option&gt; &lt;option value="1906"&gt;1906&lt;/option&gt; &lt;option value="1905"&gt;1905&lt;/option&gt; &lt;option value="1904"&gt;1904&lt;/option&gt; &lt;option value="1903"&gt;1903&lt;/option&gt; &lt;option value="1902"&gt;1902&lt;/option&gt; &lt;option value="1901"&gt;1901&lt;/option&gt; &lt;/select&gt;&lt;br&gt; &lt;br&gt; &lt;!-- &lt;input type="radio"&gt; defines a radio..radio button lets a user select only one at a time. --&gt; Gender: &amp;nbsp; &lt;input type="radio" name="gender" value="male"&gt;Male &lt;input type="radio" name="gender" value="female"&gt;Female &lt;br&gt; &lt;!-- &lt;input type="checkbox"&gt; defines a radio..radio button lets a user select only one at a time. --&gt; Hobbies: &amp;nbsp; &lt;input type="checkbox" name="Hobbies" value="Dance"&gt;Dancing &lt;input type="checkbox" name="Hobbies" value="Reading"&gt;Reading &lt;input type="checkbox" name="Hobbies" value="Singing"&gt;Singing &lt;input type="checkbox" name="Hobbies" value="Programing"&gt;Programming &lt;input type="checkbox" name="Hobbies" value="Sleeping"&gt;Sleeping &lt;br&gt; &lt;br&gt; About Me: &lt;br&gt; &lt;!-- The &lt;textarea&gt; tag defines a multi-line text input control. --&gt; &lt;textarea rows="4" cols="50" name="aboutMe"&gt; &lt;/textarea&gt; &lt;br&gt; &lt;br&gt; &lt;input type="submit" value="Submit"&gt; &lt;input type="reset" value="Reset"&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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