Calculate.java
package servlet;
public class Calculate {
private double no1=0;
private double no2=0;
public double add(String n1,String n2){
double output=0.0;
try{
no1=Double.parseDouble(n1);
no2=Double.parseDouble(n2);
output=(no1+no2);
}catch(NumberFormatException e){
}
return output;
}
public double sub(String n1,String n2){
double output=0.0;
try{
no1=Double.parseDouble(n1);
no2=Double.parseDouble(n2);
output=(no1-no2);
}catch(NumberFormatException e){
}
return output;
}
public double multiply(String n1,String n2){
double output=0.0;
try{
no1=Double.parseDouble(n1);
no2=Double.parseDouble(n2);
output=(no1*no2);
}catch(NumberFormatException e){
}
return output;
}
public double div(String n1,String n2){
double output=0.0;
try{
no1=Double.parseDouble(n1);
no2=Double.parseDouble(n2);
output=(no1/no2);
}catch(NumberFormatException e){
}
return output;
}
}
CalculateServlet.java
package servlet;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletConfig;
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 java.io.PrintWriter;
@WebServlet("/CalculateServlet")
public class CalculateServlet extends HttpServlet{
protected void doPost(HttpServletRequest
request,HttpServletResponse response)throws
ServletException,IOException{
PrintWriter out=response.getWriter();
String no1=request.getParameter("no1");
String no2=request.getParameter("no2");
String button=request.getParameter("button");
Calculate calculate=new Calculate();
double output=0;
if(button.equals("+")){
output=calculate.add(no1,no2);
out.println("Addition is:"+output+"");
}else if(button.equals("-")){
output=calculate.sub(no1,no2);
out.println("Subtraction is:"+output+"");
}else if(button.equals("*")){
output=calculate.multiply(no1,no2);
out.println("Multiplication is:"+output+"");
} else{
output=calculate.div(no1,no2);
out.println("Division is:"+output+"");
}
}
}
Result.jsp
Calculator output
<%
double value=(Double)request.getAttribute("value");
%>
Value is=<%=value%>
index.jsp
<%@page contentType="text/html" pageEncoding="ISO-8859-1"%>
Calculate numbers