Data Exchange between Controller and View in Spring Boot

Posted On: 2023-03-26 16:10:05 Spring Boot

Student.Java Model

package com.example.sunil.model;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Student {

private Integer stdId;
private String stdName;
private Double stdFee;

}

Registration.java Controller

package com.example.sunil.controller;

import java.util.Arrays;
import java.util.List;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.example.sunil.model.Student;

@Controller
@RequestMapping("/reg")
public class Registration {

@RequestMapping(value = "/show",method = RequestMethod.GET)
public String show(Model model)
{
model.addAttribute("stdId", 500);
model.addAttribute("stdName", "AJAY");
model.addAttribute("stdFee", 300.2);
return "index";
}
@GetMapping("/show1")
public String showobj(Model model)
{
Student s=new Student();
s.setStdId(500);
s.setStdName("Sunil");
s.setStdFee(500.00);
model.addAttribute("stdobj", s);
return "index";
}

@GetMapping("/show2")
public String showobjlist(Model model)
{


List<Student> list = Arrays.asList(
new Student(101, "A", 200.0),
new Student(102, "B", 300.0),
new Student(103, "C", 400.0),
new Student(104, "D", 500.0)
);

model.addAttribute("list", list);
return "index";
}

}

Registrationform.java Controller

package com.example.sunil.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import com.example.sunil.model.Student;

@Controller
@RequestMapping("/regform")
public class Registrationform {

@GetMapping("/register")
public String showReg() {
return "StudentRegister";
}


//2. Read Form Data
@PostMapping("/save")
public String saveData(
@ModelAttribute Student student, //To Read Form Data exists in spring container to Container
Model model //To read data from controller to View
)
{
System.out.println(student);
model.addAttribute("sob", student);
return "StudentData";
}

}

index.jsp

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css"/>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
Data is with Hard Coded value: ${stdId}, ${stdName}, ${stdFee} <br/>

Data is with Object: ${stdobj} <br/>${stdobj.stdId}, ${stdobj.stdName}, ${stdobj.stdFee}<br/>

Data is with ObjectList : ${list}

<table class="table table-hover">
<tr class="bg-primary text-white">
<th>ID</th>
<th>NAME</th>
<th>FEE</th>
<th>OPERATIONS</th>
</tr>
<c:forEach items="${list}" var="ob">
<tr>
<td>${ob.stdId}</td>
<td>${ob.stdName}</td>
<td>${ob.stdFee}</td>
<td>
<a href="#" class="btn btn-danger">DELETE</a> |
<a href="#" class="btn btn-success">EDIT</a>
</td>
</tr>
</c:forEach>
</table>
</body>
</html>

registra

<html>
<body>
<h2>Student Register Form</h2>
<form action="save" method="POST">
<pre>
ID : <input type="text" name="stdId"/>
NAME : <input type="text" name="stdName"/>
FEE : <input type="text" name="stdFee"/>
<input type="submit" value="Add Student"/>
</pre>
</form>
</body>
</html>

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