Spring Boot-JPA-Thymeleaf-CRUD project with source code

Hello everyone, Today we will learn how to develop a Spring Boot CRUD web application, using Thymeleaf view, embedded Tomcat and JPA.

User Interface


Following technologies stack being used:

  • Spring Boot 2.1.4.RELEASE
  • Spring 5.1.6.RELEASE 
  • Maven 3
  • JDK 1.8
  • Eclipse Oxygen
  • Bootstrap
  • Thymeleaf
  • H2DB -in memory database

Project Structure

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 http://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>2.1.4.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<artifactId>springboot-jpa-thymeleaf-crud</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>springboot-jpa-thymeleaf-crud</name>
<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>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.validation/validation-api -->
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<description>springboot-jpa-thymeleaf-crud</description>
<groupId>com.knowledgefactory</groupId>
</project>

WebController
package com.knowledgefactory.controller;

import java.util.List;
import java.util.Optional;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import com.knowledgefactory.entity.User;
import com.knowledgefactory.exception.RecordNotFoundException;
import com.knowledgefactory.service.UserService;

@Controller
public class WebController {
@Autowired
UserService service;

@GetMapping({ "/" })
public String getAllUsers(Model model) {
List<User> list = service.getAllusers();
System.out.println(list);
model.addAttribute("users", list);
return "list-users";
}

@GetMapping(path = { "/edit", "/edit/{id}" })
public String editUserById(Model model, @PathVariable("id") Optional<Long> id) throws RecordNotFoundException {
if (id.isPresent()) {
User entity = service.getUserById(id.get());
model.addAttribute("user", entity);
} else {
model.addAttribute("user", new User());
}
return "add-edit-user";
}

@GetMapping(path = "/delete/{id}")
public String deleteUserById(Model model, @PathVariable("id") Long id) throws RecordNotFoundException {
service.deleteUserById(id);
return "redirect:/";
}

@PostMapping(path = "/createUser")
public String createOrUpdateUser(User user) {
service.createOrUpdateUser(user);
return "redirect:/";
}
}

User(Entity Class)
package com.knowledgefactory.entity;

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

@Entity
@Table(name = "user")
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(name = "first_name")
private String firstName;
@Column(name = "last_name")
private String lastName;
@Column(name = "email", nullable = false, length = 200)
private String email;

public User() {
super();
}

public Long getId() {
return id;
}

public void setId(Long id) {
this.id = id;
}

public String getFirstName() {
return firstName;
}

public void setFirstName(String firstName) {
this.firstName = firstName;
}

public String getLastName() {
return lastName;
}

public void setLastName(String lastName) {
this.lastName = lastName;
}

public String getEmail() {
return email;
}

public void setEmail(String email) {
this.email = email;
}

public User(String firstName, String lastName, String email) {
super();
this.firstName = firstName;
this.lastName = lastName;
this.email = email;
}

@Override
public String toString() {
return "User [id=" + id + ", firstName=" + firstName + ", lastName=" + lastName + ", email=" + email + "]";
}
}

UserRepository
package com.knowledgefactory.repository;

import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
import com.knowledgefactory.entity.User;

@Repository
public interface UserRepository extends CrudRepository<User, Long> {
}

UserService
package com.knowledgefactory.service;

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.knowledgefactory.entity.User;
import com.knowledgefactory.exception.RecordNotFoundException;
import com.knowledgefactory.repository.UserRepository;

@Service
public class UserService {
@Autowired
UserRepository repository;

public List<User> getAllusers() {
List<User> result = (List<User>) repository.findAll();
if (result.size() > 0) {
return result;
} else {
return new ArrayList<User>();
}
}

public User getUserById(Long id) throws RecordNotFoundException {
Optional<User> user = repository.findById(id);
if (user.isPresent()) {
return user.get();
} else {
throw new RecordNotFoundException("No user record exist for given id");
}
}

public User createOrUpdateUser(User entity) {
if (entity.getId() == null) {
entity = repository.save(entity);
return entity;
} else {
Optional<User> user = repository.findById(entity.getId());
if (user.isPresent()) {
User newEntity = user.get();
newEntity.setEmail(entity.getEmail());
newEntity.setFirstName(entity.getFirstName());
newEntity.setLastName(entity.getLastName());
newEntity = repository.save(newEntity);
return newEntity;
} else {
entity = repository.save(entity);
return entity;
}
}
}

public void deleteUserById(Long id) throws RecordNotFoundException {
Optional<User> user = repository.findById(id);
if (user.isPresent()) {
repository.deleteById(id);
} else {
throw new RecordNotFoundException("No user record exist for given id");
}
}
}

Spring Boot(Main Class)
package com.knowledgefactory;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import com.knowledgefactory.entity.User;
import com.knowledgefactory.repository.UserRepository;

@SpringBootApplication
public class KnowledgefactorydemoApplication implements CommandLineRunner {
@Autowired
private UserRepository repository;

public static void main(String[] args) {
SpringApplication.run(KnowledgefactorydemoApplication.class, args);
}

@Override
public void run(String... args) throws Exception {
repository.save(new User("sibin", "knf", "sibinraziya@gmail.com"));
}
}

add-edit-user.html
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">

<head>
<meta charset="utf-8">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<title>Add User</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.4.1/css/all.css">
<link rel="stylesheet" type="text/css" media="all" href="../../bootstrap.min.css" th:href="@{/bootstrap.min.css}" />
</head>

<body>
<div class="container my-5">
<h3>Add User</h3>
<div class="card">
<div class="card-body">
<div class="col-md-10">
<form action="#" th:action="@{/createUser}" th:object="${user}" method="post">
<div class="row">
<div class="form-group col-md-8">
<label for="name" class="col-form-label">First Name</label> <input type="text" th:field="*{firstName}"
class="form-control" id="firstName" placeholder="First Name" />
</div>
<div class="form-group col-md-8">
<label for="name" class="col-form-label">Last Name</label> <input type="text" th:field="*{lastName}"
class="form-control" id="lastName" placeholder="Last Name" />
</div>
<div class="form-group col-md-8">
<label for="email" class="col-form-label">Email</label> <input type="text" th:field="*{email}"
class="form-control" id="email" placeholder="Email Id" />
</div>
<div class="col-md-6">
<input type="submit" class="btn btn-success" value=" Submit ">
</div>
<input type="hidden" id="id" th:field="*{id}">
</div>
</form>
</div>
</div>
</div>
</div>
</body>
</html>

list-users.html
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">

<head>
<meta charset="utf-8">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<title>All Users</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" type="text/css" media="all" href="../../bootstrap.min.css" th:href="@{/bootstrap.min.css}" />
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.4.1/css/all.css">
</head>

<body>
<div class="container my-2">
<div class="card">
<div class="card-body">
<div th:switch="${users}" class="container my-5">
<p class="my-5">
<a href="/edit" class="btn btn-success"> <i class="fas fa-user-plus ml-2"> Add User </i></a>
</p>
<div class="col-md-10">
<h2 th:case="null">No record found !!</h2>
<div th:case="*">
<table class="table table-striped table-responsive-md">
<thead>
<tr>
<th>First Name</th>
<th>Last Name</th>
<th>Email</th>
<th>Edit</th>
<th>Delete</th>
</tr>
</thead>
<tbody>
<tr th:each="user : ${users}">
<td th:text="${user.firstName}"></td>
<td th:text="${user.lastName}"></td>
<td th:text="${user.email}"></td>
<td><a th:href="@{/edit/{id}(id=${user.id})}" class="btn btn-warning"> <i
class="fas fa-user-edit ml-2"></i>
</a></td>
<td><a th:href="@{/delete/{id}(id=${user.id})}" class="btn btn-danger"> <i
class="fas fa-user-times ml-2"></i>
</a></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
</div>
</div>
</body>

</html>

Run
$ mvn spring-boot:run

by sibin
web solution consultant for the startups
+91-8075866854

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