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Create Simple Interest Program using Bean class in Spring MVC



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>
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