communication between jsp and servlet

[kanna kancharla]

i'm new to java.
actually i want to transfer the data from jsp file which is used as an interface to servlet and then the servlet has to preform the related calculations and dispatch the result to another jsp file. following is the code which I've used for that but it's not working. any expert who sees the post please try to solve my problem
and please give the code which i should use. thanks in advance

package com.servlet.servlet;

import java.io.IOException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.mixdesign.pkg.Cem;
import com.mixdesign.pkg.Fa;
import com.mixdesign.pkg.admq;
import com.mixdesign.pkg.ca1;
import com.mixdesign.pkg.ca2;
import com.mixdesign.pkg.water;
import com.mixdesign.pkg.wcr;

/**
 * Servlet implementation class Calculations
 */
@WebServlet("/Calculations")
public class Calculations extends HttpServlet {
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	public void dopost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		int mix = Integer.parseInt(request.getParameter("mix"));
		int msa = Integer.parseInt(request.getParameter("msa"));
		double workability = Double.parseDouble(request.getParameter("workability"));
		String ta = request.getParameter("ta");
		String ct = request.getParameter("ct");
		String ec = request.getParameter("ec");
		String adm = request.getParameter("adm");
		String mplacing = request.getParameter("mplacing");
		String cwc = request.getParameter("cwc");
		int fac = Integer.parseInt(request.getParameter("fac"));
		String sd = request.getParameter("sd");
		double SGC = Double.parseDouble(request.getParameter("SGC"));
		double SGFA = Double.parseDouble(request.getParameter("SGFA"));
		double SGCA = Double.parseDouble(request.getParameter("SGCA"));
		double SGA = Double.parseDouble(request.getParameter("SGA"));
		double WAFA = Double.parseDouble(request.getParameter("WAFA"));
		double WACA = Double.parseDouble(request.getParameter("WACA"));
		double SMFA = Double.parseDouble(request.getParameter("SMFA"));
		double SMCA = Double.parseDouble(request.getParameter("SMCA"));
		double CQ = Double.parseDouble(request.getParameter("CQ"));
		Cem calc = new Cem();
		float cem = calc.cem(mix,msa,workability,ta,ct,ec,adm,mplacing,cwc,fac,sd,SGC,SGFA,SGCA,SGA,WAFA,WACA,SMFA,SMCA,CQ);
		Fa calc1 = new Fa();
		float fa = calc1.fa(mix,msa,workability,ta,ct,ec,adm,mplacing,cwc,fac,sd,SGC,SGFA,SGCA,SGA,WAFA,WACA,SMFA,SMCA,CQ);
		 ca2 calc2 = new ca2();
		float ca2 = calc2.ca2(mix,msa,ta,ct,ec,adm,mplacing,cwc,fac,sd,SGC,SGFA,SGCA,SGA);
		 ca1 calc3 = new ca1();
		float ca1 = calc3.ca1(mix,msa,ta,ct,ec,adm,mplacing,cwc,fac,sd,SGC,SGFA,SGCA,SGA);
		admq calc4 = new admq();
		float admq = calc4.admq(mix,msa,ta,ct,ec,adm,mplacing,cwc,fac);
		 water calc5 = new water();
		float water = calc5.water(mix,msa,workability,ta,ct,ec,adm,fac);
		 wcr calc6 = new wcr();
		float wcr = calc6.wcr1(mix,ct,ec,cwc, sd);
		request.setAttribute("cem",cem );
		request.setAttribute("fa",fa );
		request.setAttribute("ca2",ca2 );
		request.setAttribute("ca1",ca1 );
		request.setAttribute("admq",admq );
		request.setAttribute("water",water );
		request.setAttribute("wcr",wcr );
		RequestDispatcher dispatcher = request.getRequestDispatcher("Mixresult.jsp");
		dispatcher.forward(request, response);
	
		
	}
	

}

[Ashwin Sridhar]

Please give us more info. Also use code tags to post your code. If you received any exception on your console, post that .

[kanna kancharla]

thanks ashwin for replaying

i didn't got any exception on console---

the below one is the jsp code which is used for interface

  <table border=1 cellspacing=5 align="center">
	<tr>
	<th colspan=6 style="background-color:YellowGreen">Design stipulation</th></tr>
<tr><td>Mix Design for:</td><td><input type="text" name="mix" size="20" autofocus="autofocus">MPa</td></tr>
<tr>
    <td>Maximum size of aggregate:</td><td><input type="text" name="msa" size="20">mm</td>
    </tr>
<tr>
    <td>workability:</td><td><input type="text" name="workability" size="20">mm</td>
    </tr>
<tr>
    <td>Type of Aggregate:</td><td><select name="ta">
    <option value="Angular Coarse Aggregates">Angular Coarse Aggregates</option>
    <option value="Sub - Angular Aggregates">Sub - Angular Aggregates</option>
    <option value="Gravel with Crushed aggregates">Gravel with Crushed aggregates</option>
    <option value="Rounded Gravel">Rounded Graveld</option>
    </select></td>
    </tr>
<tr>
	<td>Concrete Type:</td><td colspan=2><input type="radio" name="ct" value="pc" /> Plain Concrete<input type="radio" name="ct" value="rc" />Reinforced Concrete</td>
	</tr>
<tr>
    <td>Exposure Condition:</td><td><select name="ec">
    <option value="Mild">Mild</option>
    <option value="Moderate">Moderate</option>
    <option value="Severe">Severe</option>
    <option value="VerySevere">VerySevere</option>
    <option value="Extreme">Extreme</option>
    </select></td>
    </tr>
<tr>
    <td>Cemical admixture added:</td><td><input type="radio" name="adm" value="Yes" checked="checked" onclick="toggle3('show');"/> Yes<input type="radio" name="adm" value="No" checked="checked" onclick="toggle3('hide');"/> No</td></tr>
<tr>
    <td>Method of concrete placing:</td><td colspan=2><input type="radio" name="mplacing" value="p" /> Pumping<input type="radio" name="mplacing" value="wp" /> With-out Pumping</td></tr>
<tr>
    <td>Water-Cement Ratio is based on:</td> <td colspan=3><input type="radio" name="cwc" checked="checked" onclick="toggle1('no');"/> IS Code 456-2000
    <input type="radio" name="cwc" checked="checked" onclick="toggle1('hide');"/> IS Code 10262-1982
   <input type="radio" name="cwc" checked="checked" onclick="toggle1('show');"/> Custom W\C Ratio</td></tr>
   <script type="text/javascript">
    function toggle1(value){
if(value=='show'){
 document.getElementById('wct').style.visibility='visible';}
else{
 document.getElementById('wct').style.visibility='hidden';}
}</script>
   
  <tr><td align=left width=25%>Enrter Custom Water-Cement Ratio:</td><td><input type="text" name="cwcv" id="wct"></input></td>
</tr> <tr>     
    <th colspan=6 style="background-color:YellowGreen">Test data for materials</th></tr><tr>
  <th colspan=2 style="background-color:lightblue"><font color=blue face="Arial" size=4>Specific gravity of materials</font></th><th colspan=2 style="background-color:lightblue"><font color=blue face="Arial" size=4>Water absorption</font></th><th colspan=2 style="background-color:lightblue"><font color=blue face="Arial" size=4>Free Surface Moisture</font></th></tr>
    
	<tr>
    <td width=250 height=25 >Cement:</td><td width=50 height=25><input type="text" name="SGC" size="30"></td>	<td>Fine Aggregates:</td><td><input type="text" name="WAFA" size="18"></td><td>Fine Aggregates:</td><td><input type="text" name="SMFA" size="18"></td></tr>
<tr>
       <td>Fine Aggregates:</td><td><input type="text" name="SGFA" size="30"></input></td><td>Coarse Aggregates:</td><td><input type="text" name="WACA" size="18"></td><td>Coarse Aggregates:</td><td><input type="text" name="SMCA" size="18"></td></tr>
<tr>
    <td>Coarse Aggregates:</td><td><input type="text" name="SGCA" size="30"></td></tr>
<tr>
    <td>Admixture:</td><td><input type="text" name="SGA" id="tadm" size="30"></td>
     </tr>
     <script type="text/javascript">
    function toggle3(value){
if(value=='show'){
 document.getElementById('tadm').style.visibility='visible';}
else{
 document.getElementById('tadm').style.visibility='hidden';}
}</script>
     <tr></tr><tr></tr><tr>
      <td colspan=2 align=left>Fine Aggregate confirming to IS 383-1970:</td><td><select name="fac">
    <option value="1">zone i</option>
    <option value="2">Zone ii</option>
    <option value="3">Zone iii</option>
    <option value="4">zone iv</option>
    </select></td>
    </tr><tr>
	   <th colspan=6 style="background-color:YellowGreen">Target mean strength</th></tr>
    <td align=left>Standard Deviation Based on:</td>
    <td colspan=2><input type="radio" name="sd" checked="checked" onclick="toggle2('hide');"/> IS Code 10262-2009<input type="radio" name="sd" checked="checked" onclick="toggle2('show');"/> Custom SD</td>
	<script type="text/javascript">
	 function toggle2(value){
if(value=='show')
{ document.getElementById('sdt').style.visibility='visible';}
else{
 document.getElementById('sdt').style.visibility='hidden';}
}</script>
	<tr><td align=left>Enrter Custom SD:</td><td><input type="text" name="sdv" id="sdt"></input></td>
</tr><tr>
    <td align=left>Concrete quantity:</td><td><input type="text" name="CQ" size=15></input>cum</td>
    </tr>
</table><br></br>
<div align=center>
<input type="submit" name="Submit" style="width:200px; height:40px" value="Claculate"></input></div>
</form>

this is code for displaying result from servlet

</table>
<% 
float cem=(Float)request.getAttribute("cem");
float fa=(Float)request.getAttribute("fa");
float ca2=(Float)request.getAttribute("ca2");
float ca1=(Float)request.getAttribute("ca1");
float admq=(Float)request.getAttribute("admq");
float water=(Float)request.getAttribute("water");
float wcr=(Float)request.getAttribute("wcr");
%>
<table>
	<tr>
		<td>Cement:</td><td><%=cem %></td></tr><tr>
		<td>Fine Aggregate:</td><td><%=fa %></td></tr><tr>
		<td>Coarse Aggregate 20mm:</td><td><%=ca2 %></td></tr><tr>
		<td>Coarse Aggregate 10mm:</td><td><%=ca1 %></td></tr><tr>
		<td>Admixtur:e</td><td><%=admq %></td></tr><tr>
		<td>Water:</td><td><%=water %></td></tr><tr>
		<td>Water Cement Ratio:</td><td><%=wcr %></td>
	</tr>
</table>

[Ashwin Sridhar]

Please show your form tag in jsp. Is your action correspond to the annotation you have given in your servlet.

[kanna kancharla]

resolved