ThiriYadanar for Rey Tech Inc.

Posted on Jul 31, 2020

Create and View Employee Using JPA, Springboot and Thymeleaf

#springboot #thymeleaf #java #springdatajpa

Project Structure

Here is the project structure.

Maven Dependencies pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>2.3.2.RELEASE</version>
      <relativePath />
      <!-- lookup parent from repository -->
   </parent>
   <groupId>com.springboot.tutorial</groupId>
   <artifactId>springboot-helloworld-tutorial</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>CreateEmployee</name>
   <description>Demo project for Spring Boot</description>
   <properties>
      <java.version>1.8</java.version>
   </properties>
   <dependencies>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-data-jpa</artifactId>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-thymeleaf</artifactId>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-web</artifactId>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-devtools</artifactId>
         <scope>runtime</scope>
         <optional>true</optional>
      </dependency>
      <dependency>
         <groupId>mysql</groupId>
         <artifactId>mysql-connector-java</artifactId>
         <scope>runtime</scope>
      </dependency>
      <dependency>
         <groupId>org.projectlombok</groupId>
         <artifactId>lombok</artifactId>
         <scope>provided</scope>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-test</artifactId>
         <scope>test</scope>
         <exclusions>
            <exclusion>
               <groupId>org.junit.vintage</groupId>
               <artifactId>junit-vintage-engine</artifactId>
            </exclusion>
         </exclusions>
      </dependency>
   </dependencies>
   <build>
      <plugins>
         <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
         </plugin>
      </plugins>
   </build>
</project>

Domain Layer

The domain layer is a collection of entity objects and related business logic that is designed to represent the business model.

Let's create a JPA Employee entity:

package com.springboot.tutorial.entity;


import java.time.LocalDate;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

import org.springframework.format.annotation.DateTimeFormat;
import lombok.Data;

@Entity
@Table(name="employee")
@Data
public class Employee {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    private int id;

    @Column(name = "name")
    private String name;

    @Column(name = "age")
    private int age;

    @Column(name = "gender")
    private String gender;

    @Column(name = "joiningDate")
    @DateTimeFormat(pattern = "yyyy-MM-dd")
    private LocalDate joiningDate;

    @Column(name = "retiringDate")
    @DateTimeFormat(pattern = "yyyy-MM-dd")
    private LocalDate retiringDate;

    @Column(name="dept")
    private String dept;

}

Controller Layer

This layer is responsible for processing the user’s input and returning the correct response back to the user.

Let’s create an EmployeeController class to send requests and bind data to the user’s view.

package com.springboot.tutorial.controller;

import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
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.bind.annotation.RequestParam;
import com.springboot.tutorial.entity.Employee;
import com.springboot.tutorial.service.EmployeeService;

@Controller
public class EmployeeController {

    @Autowired
    private EmployeeService service;

    @RequestMapping("/")
    public String viewHomePage(Model model) {
        List<Employee> employeeList = service.listAll();
        model.addAttribute("listAll", employeeList);
        return "index";
    }

    @RequestMapping("/new")
    public String showNewEmployeePage(Model model) {
        Employee employee = new Employee();
        model.addAttribute("employee", employee);
        return "new_employee";
    }

    @RequestMapping(value = "/save", method = RequestMethod.POST)
    public String saveEmployee(@ModelAttribute("employee") Employee employee, Model model, BindingResult result) {
        service.save(employee);
        List<Employee> employeeList = service.listAll();
        model.addAttribute("listAll", employeeList);
        model.addAttribute("employeeAttr", employee);
        return "index";
    }
}

Service Layer

This layer is the middleware between Controller and Repository.

The service gathers data from controller, performs validation and business logic, and calling repositories for data manipulation.

Let’s create EmployeeService interface to send the user’s requests from Controller to Repository.

package com.springboot.tutorial.service;

import java.util.List;
import com.springboot.tutorial.entity.Employee;
public interface EmployeeService {

    List < Employee > listAll();

    void save(Employee employee);

}

And create EmployeeServiceImpl class that implements EmployeeService interface and connect to Repository by using @Autowired keyword.

package com.springboot.tutorial.service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.springboot.tutorial.entity.Employee;
import com.springboot.tutorial.repository.EmployeeRepository;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeRepository repo;

    @Override
    public List < Employee > listAll() {
        return repo.findAll();
    }

    @Override
    public void save(Employee emp) {
        repo.save(emp);
    }
}

Repository Layer

Spring Data JPA allows implementing JPA-based repositories

We don't need to write any DAO code but Spring Data JPA will generate an implementation automatically at runtime.

Let's create an EmployeeRepository class with the following code:

package com.springboot.tutorial.repository;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

import com.springboot.tutorial.entity.Employee;
@Repository
public interface EmployeeRepository extends JpaRepository<Employee, Long> {

}

View Layer

We need to create the HTML pages for displaying the Employee’s registration form and showing the registered Employee’s list under the src/main/resources/templates folder.

We will use Thymeleaf as the underlying template engine for parsing the template files.

Let’s create an index.html as a welcome page and to show the registered Employee’s list.

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
   xmlns:th="http://www.thymeleaf.org">
   <head>
      <meta charset="utf-8" />
      <title>Employee Management</title>
      <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
      <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
      <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
      <link rel="stylesheet" href="https://cdn.datatables.net/1.10.12/css/jquery.dataTables.min.css">
      <script src="https://cdn.datatables.net/1.10.12/js/jquery.dataTables.min.js"></script>
      <script type="text/javascript">
         $(document).ready(function() {
            $('#data-table').DataTable();
         });
      </script>
   </head>
   <body>
      <div class="content">
         <div class="animated fadeIn">
            <div class="row">
               <div class="col-md-12">
                  <div class="card">
                     <div class="card-header">
                        <strong class="card-title">
                           <h1 style="text-align: center; color: #b30000; font-weight: bold;">EMPLOYEE MANAGEMENT</h1>
                        </strong>
                        <div style="text-align: center; font-weight: bold">
                           <a href="new">Create New Employee</a> <br /> 
                        </div>
                     </div>
                     <div class="card-body">
                        <table id="data-table" class="table table-striped table-bordered">
                           <thead>
                              <tr>
                                 <th>Employee ID</th>
                                 <th>Name</th>
                                 <th>Age</th>
                                 <th>Department</th>
                                 <th>Gender</th>
                                 <th>Joining Date</th>
                                 <th>Retiring Date</th>
                              </tr>
                           </thead>
                           <tbody>
                              <tr th:each="employee:${listAll}">
                                 <td th:text="${employee.id}">Product ID</td>
                                 <td th:text="${employee.name}">Name</td>
                                 <td th:text="${employee.age}">Age</td>
                                 <td th:text="${employee.dept}">Department</td>
                                 <td th:text="${employee.gender}">Gender</td>
                                 <td th:text="${employee.joiningDate}">Joining Date</td>
                                 <td th:text="${employee.retiringDate}">Retiring Date</td>
                              </tr>
                           </tbody>
                        </table>
                     </div>
                  </div>
               </div>
            </div>
         </div>
      </div>
   </body>
</html>

And create a new_employee.html page as a registration form page.

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
   xmlns:th="http://www.thymeleaf.org">
   <head>
      <meta charset="utf-8" />
      <title>Create New Employee</title>
      <link rel="stylesheet"
         href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
      <link rel="stylesheet" href="/resources/demos/style.css">
      <script src="https://code.jquery.com/jquery-1.12.4.js"></script>
      <script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
      <script>
         $(function() {
            $("#join_datepicker").datepicker({
                dateFormat : "yy-mm-dd"
            });
            $("#retire_datepicker").datepicker({
                dateFormat : "yy-mm-dd"
            });
         });
      </script>
   </head>
   <body>
      <div align="center">
         <h1>Create New Emloyee</h1>
         <br />
         <form action="#" th:action="@{/save}" th:object="${employee}"
            method="post">
            <table border="0" cellpadding="10">
               <tr>
                  <td>Employee Name:</td>
                  <td><input type="text" th:field="*{name}" /></td>
               </tr>
               <tr>
                  <td>Age:</td>
                  <td><input type="text" th:field="*{age}" /></td>
               </tr>
               <tr>
                  <td>Department:</td>
                  <td>
                     <select th:field="*{dept}">
                        <option th:value="IT" th:text="IT"></option>
                        <option th:value="HR" th:text="HR"></option>
                        <option th:value="Sales" th:text="Sales"></option>
                     </select>
                  </td>
               </tr>
               <tr>
                  <td>Gender:</td>
                  <td><input type="radio" th:field="*{gender}" th:value="Male"
                     th:text="Male" /> <input type="radio" th:field="*{gender}"
                     th:value="Female" th:text="Female" /></td>
               </tr>
               <tr>
                  <td>Joining Date:</td>
                  <td><input type="date" id="join_datepicker"
                     th:field="*{joiningDate}"></td>
               </tr>
               <tr>
                  <td>Retiring Date:</td>
                  <td><input type="date" id="retire_datepicker"
                     th:field="*{retiringDate}"></td>
               </tr>
               <tr>
                  <td colspan="2"><button type="submit">Save</button></td>
               </tr>
            </table>
         </form>
      </div>
   </body>
</html>

Running the Application

Let's access web application using http://localhost:8080. Initially, you don't have any employee in the list.

Let's add a new employee first.

You can download the source code at
github

Top comments (1)

Syedidrisahmed • May 3 '21

Please Create Spring boot application for search employee department project data contains name and code,
join date between (from and till)
And have to submit all the details
(project structure)

DEV Community

Create and View Employee Using JPA, Springboot and Thymeleaf

Top comments (1)

Read next

Records vs Clases en Java

Create a native Kotlin or JAVA application with Spring Boot Native, Gradle, and GraalVM without Docker for MacOS and Windows

Testcontainers MongoDB ReplicaSet

Beginner in Cloud