Create Simple Interest Program using Bean class in Spring MVC

Author - Shiva Gautam
9/04/2021
0


Step1st:-  Create a dynamic web project and add Dispatcher Servlet under web-inf/scs-servlet.xml

<?xml version="1.0" encoding="UTF-8"?> 
<beans xmlns="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:p="http://www.springframework.org/schema/p" 
    xmlns:context="http://www.springframework.org/schema/context" 
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
http://www.springframework.org/schema/context 
http://www.springframework.org/schema/context/spring-context-3.0.xsd"> 

    <context:component-scan base-package="bao"></context:component-scan>
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/uao/"></property>
    <property name="suffix" value=".jsp"></property>
    </bean>
    <bean id="multipartResolver"  
class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/> 
    </beans>

step2nd:-  append code under web.xml file

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" id="WebApp_ID" version="4.0">
  <display-name>SpringHelloWorldNew</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
   <servlet>
    <servlet-name>scs</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>scs</servlet-name>
    <url-pattern>*.html</url-pattern>
  </servlet-mapping>
</web-app>

STEP 3rd:-
Create bean class using scsbean package under src:-
package scsbean;

public class SI {
private float p;
private float r;
private float t;
public float getP() {
    return p;
}
public void setP(float p) {
    this.p = p;
}
public float getR() {
    return r;
}
public void setR(float r) {
    this.r = r;
}
public float getT() {
    return t;
}
public void setT(float t) {
    this.t = t;
}



}
STEP 4thCreate Controller under bao package

package bao;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import scsbean.SI;

@Controller
public class SIController {
    @RequestMapping(value = "/si", method = RequestMethod.GET)
      public ModelAndView siload() {
        return new ModelAndView("siform", "command", new SI());
       }
    @RequestMapping(value = "/silogic", method = RequestMethod.POST)
      public ModelAndView silogic(@ModelAttribute("SpringWeb")SI s, ModelMap model) {
         
         float s1 = (s.getP()*s.getR()*s.getT())/100;
         return new ModelAndView("siresult","res",s1);
       }
}
step 5th:-

Create View to load form and action siform.jsp and siresult.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
    <%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form:form action="silogic.html" method="POST">     
<table><tbody>
<tr>        <td><form:label path="p">P :</form:label></td>      <td><form:input path="p"></form:input></td>    </tr>
<tr>      <td><form:label path="r">R:</form:label></td>       <td><form:input path="r"></form:input></td>    </tr>
<tr>       <td><form:label path="t">T:</form:label></td>       <td><form:input path="t"></form:input></td>     </tr>

<tr>         <td colspan="2"><input type="submit" value="Submit"/> </td>       </tr>
</tbody></table>
</form:form>


</body>
</html>

siresult.jsp


<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
${res}
</body>
</html>


Note:-

If we want to display results on the same pages then we will implement two modifications

1)  edit logic method code


@RequestMapping("silogic")
public ModelAndView siLogic(@ModelAttribute("SpringMVCHello")SI s, ModelMap model)
{
float si = (s.getP()*s.getR()*s.getT())/100;
ModelAndView obj =new ModelAndView("siform", "command", new SI());
obj.addObject("res",  "Result is "+si);
return obj ;
}

2)  write code on JSP pages

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
   <%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
</head>
<body>
<form:form action="silogic.html" method="POST">

<table>

<tr><td><form:label path="p" /></td><td><form:input path="p" /></td></tr>
<tr><td><form:label path="r" /></td><td><form:input path="r" /></td></tr>
<tr><td><form:label path="t" /></td><td><form:input path="t" /></td></tr>
<tr><td></td><td><input type="submit" value="Submit"/></td></tr>
</table>
</form:form>
<%
if(request.getAttribute("res")!=null)
{
out.print(request.getAttribute("res"));
}


%>
</body>
</html>


Another Example of Spring MVC to Check Prime Number?


1)  Create bean class

package dao;

public class PrimeNum {
private int num;

public int getNum() {
return num;
}

public void setNum(int num) {
this.num = num;
}


}


2)  Create Controller to load JSP Page

package bao;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import dao.PrimeNum;;

@Controller
public class PrimeController {
@RequestMapping("prime")
public ModelAndView pload()
{
return new ModelAndView("prime", "command", new PrimeNum());
}
}


3)  Create JSP Page and bind bean Object

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
 <%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
</head>
<body>
<form:form action="primelogic.html" method="post">
<form:label path="num"></form:label>
<form:input path="num"/>
<br>
<input type="submit" name="btnsubmit" value="Click" />

</form:form>


</body>
</html>


4)  Create Logic Method under the controller

@RequestMapping("primelogic")
public ModelAndView primeLogic(@ModelAttribute("SpringMVCHello")PrimeNum s, ModelMap model)
{
String result="";
int i;
for(i=2;i<s.getNum();i++)
{
if(s.getNum()%i==0)
{
result = "Not prime";
break;
}
}
if(s.getNum()==i)
{
result = "prime"; 
}
ModelAndView obj =new ModelAndView("prime", "command", new PrimeNum());
obj.addObject("res",  "Result is "+result);
return obj ;
}


5)  Write output code under JSP Page

<%
if(request.getAttribute("res")!=null)
{
out.print(request.getAttribute("res"));
}


%>

6)  Call PrimeController from index.jsp using Hyperlink

    <a href="prime.html">Prime</a>



FIBONACCI SERIES?

package dao;

public class Fab {
private int num;

public int getNum() {
return num;
}

public void setNum(int num) {
this.num = num;
}


}



    package bao;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import dao.Fab;

@Controller
public class FabController {

@RequestMapping("fab")
public ModelAndView pload()
{
return new ModelAndView("fab", "command", new Fab());
}
@RequestMapping("fablogic")
public ModelAndView fabLogic(@ModelAttribute("SpringMVCHello")Fab s, ModelMap model)
{
String result="";
int i,a=-1,b=1,c=0;
for(i=1;i<s.getNum();i++)
{
c=a+b;
result = result +c + " ";
a=b;
b=c;
}
ModelAndView obj =new ModelAndView("fab", "command", new Fab());
obj.addObject("res",  "Result is "+result);
return obj ;
  
}
}


<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
</head>
<body>
<form:form action="fablogic.html" method="post">
<form:label path="num"></form:label>
<form:input path="num"/>
<br>
<input type="submit" name="btnsubmit" value="Click" />

</form:form>

<%
if(request.getAttribute("res")!=null)
{
out.print(request.getAttribute("res"));
}


%>
</body>
</html>
Tags
Shiva Gautam

Shiva Gautam

Hi, I'm Shiva Gautam. With over 15 years of diverse experience in various IT domains, I am now an entrepreneur focusing on both training and software development. My expertise spans across multiple technologies, and I've authored numerous articles on subjects including Java, Python, REACT, NODE, ANGULAR, Cloud, software testing, Django framework, C#, Flutter, Salesforce, Ruby on Rails, .NET, AWS, DEVOPS, AI/ML and more. For additional information, please visit shivaconceptsolution.com and kangaroosoftware.net.

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