Spring Boot, Vue.js, and PrimeVue - Building a CRUD Todo App

In this section, we will build a Todo CRUD app with Spring Boot, Vue.js, PrimeVue, and PostgreSQL.

Technologies Used

  • Java 17
  • Spring Boot 3.3.0
  • Spring Data JPA
  • Lombok
  • PostgreSQL
  • Vue 3
  • PrimeVue

After completing this tutorial what we will build?

We will build a full-stack web application that is a basic Todo Management Application with CRUD features: 

  • Create Todo 
  • List Todo 
  • Update Todo 
  • Delete Todo 

1. Backend development

First, open the Spring initializr https://start.spring.io

Then, Provide the Group and Artifact name. We have provided Group name com.knf.dev.demo and Artifact todo-service. Here I selected the Maven project - language Java 17 - Spring Boot 3.3.0, Spring Web, PostgreSQL Driver, Spring Data JPA, and Lombok.

Then, click on the Generate button. When we click on the Generate button, it starts packing the project in a .zip(todo-service) file and downloads the project. Then, Extract the Zip file. 

Then, import the project on your favourite IDE. 

Final Project Directory


Complete pom.xml

POM is an XML file that contains information about the project and configuration details utilized by Maven to build the project. It contains default values for most projects. More Info

<?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>3.3.0</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.knf.dev.demo</groupId>
   <artifactId>todo-service</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>todo-service</name>
   <description>Demo project for Spring Boot, Vue.js, and Primevue</description>
   <properties>
      <java.version>17</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-web</artifactId>
      </dependency>

      <dependency>
         <groupId>org.postgresql</groupId>
         <artifactId>postgresql</artifactId>
         <scope>runtime</scope>
      </dependency>
      <dependency>
         <groupId>org.projectlombok</groupId>
         <artifactId>lombok</artifactId>
         <optional>true</optional>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-test</artifactId>
         <scope>test</scope>
      </dependency>
   </dependencies>

   <build>
      <plugins>
         <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
         </plugin>
      </plugins>
   </build>

</project>

application.yaml

Let’s configure Spring Boot to use PostgreSQL as our data source. We are simply adding PostgreSQL database URL, username, and password in the src/main/resources/application.yaml
spring:
  datasource:
    url: jdbc:postgresql://localhost:5432/postgres
    username: postgres
    password: root
  jpa:
    hibernate:
      ddl-auto: update  # Hibernate ddl auto (create, create-drop, validate, update),production set to none or comment it

server:
  port: 8090

Spring Data JPA – Todo Entity

A Todo object as JPA entity.
package com.knf.dev.demo.entity;

import jakarta.persistence.*;
import lombok.*;

@Entity
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class Todo {

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE)
    private long id;

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

    private String email;

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

    private  String gender;
}

Spring Data JPA – Todo Repository

JpaRepository is a JPA-specific extension of Repository. It contains an API for basic CRUD operations and also API for pagination and sorting.
package com.knf.dev.demo.repository;

import com.knf.dev.demo.entity.Todo;
import org.springframework.data.jpa.repository.JpaRepository;

public interface TodoRepository extends JpaRepository<Todo,Long> {
}

Create Custom Error Response

package com.knf.dev.demo.exception;

import com.fasterxml.jackson.annotation.JsonFormat;
import lombok.Data;

import java.time.LocalDateTime;

@Data
public class CustomErrorResponse {

    @JsonFormat(shape = JsonFormat.Shape.STRING,
            pattern = "yyyy-MM-dd hh:mm:ss")
    private LocalDateTime timestamp;
    private int status;
    private String error;

}

Create ResourceNotFoundException

package com.knf.dev.demo.exception;

public class ResourceNotFoundException extends RuntimeException{

   private static final long serialVersionUID = 1L;
   
   public ResourceNotFoundException(String message) {
      super(message);
   }
}

Create GlobalExceptionHandler

@ControllerAdvice allows us to handle exceptions across the whole application, not just to an individual controller. The @ExceptionHandler is an annotation used to handle the specific exceptions and sending the custom responses to the client.
package com.knf.dev.demo.exception;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.context.request.WebRequest;

import java.time.LocalDateTime;

@ControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(ResourceNotFoundException.class)
    public ResponseEntity<CustomErrorResponse> globalExceptionHandler
            (Exception ex, WebRequest request) {

        CustomErrorResponse errors = new CustomErrorResponse();
        errors.setTimestamp(LocalDateTime.now());
        errors.setError(ex.getMessage());
        errors.setStatus(HttpStatus.NOT_FOUND.value());

        return new ResponseEntity<>(errors, HttpStatus.NOT_FOUND);
    }
}

Create Todo Controller

Using the @CrossOrigin annotation to enable cross-origin calls.

import com.knf.dev.demo.entity.Todo;
import com.knf.dev.demo.exception.ResourceNotFoundException;
import com.knf.dev.demo.repository.TodoRepository;
import lombok.RequiredArgsConstructor;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@CrossOrigin(origins = "*")
@RestController
@RequestMapping("/todos")
@RequiredArgsConstructor
public class TodoController {

    private final TodoRepository todoRepository;


    @GetMapping
    public ResponseEntity<List<Todo>> getAllTdo() {
        return ResponseEntity.ok(todoRepository.findAll());
    }

    @GetMapping("/{id}")
    public ResponseEntity<Todo> getTodoById(@PathVariable(value = "id")
                                 Long id) throws ResourceNotFoundException {

        Todo todo = todoRepository.findById(id)
                .orElseThrow(() -> new ResourceNotFoundException
                        ("Todo not found for this id :: " + id));
        return ResponseEntity.ok(todo);
    }

    @PostMapping
    public ResponseEntity<?> createTodo(@RequestBody Todo todo) {

        return ResponseEntity.ok(todoRepository.save(todo));
    }

    @PutMapping("/{id}")
    public ResponseEntity<Todo> updateTodo(@PathVariable(value = "id")
                                           Long id, @RequestBody Todo todoDto)
            throws ResourceNotFoundException {

        Todo todo = todoRepository.findById(id)
                .orElseThrow(() -> new ResourceNotFoundException
                        ("Todo not found for this id :: " + id));

        todo.setEmail(todoDto.getEmail());
        todo.setLastName(todoDto.getLastName());
        todo.setFirstName(todoDto.getFirstName());
        todo.setGender(todoDto.getGender());
        todo.setId(id);
        final Todo updateTodo = todoRepository.save(todo);
        return ResponseEntity.ok(updateTodo);
    }

    @DeleteMapping("/{id}")
    public ResponseEntity<Boolean> deleteTodo(@PathVariable(value = "id")
                           Long id) throws ResourceNotFoundException {

        Todo todo = todoRepository.findById(id)
                .orElseThrow(() -> new ResourceNotFoundException
                        ("Todo not found for this id :: " + id));

        todoRepository.delete(todo);

        return ResponseEntity.ok(true);
    }
}

TodoServiceApplication.java

package com.knf.dev.demo;

import com.knf.dev.demo.entity.Todo;
import com.knf.dev.demo.repository.TodoRepository;
import lombok.RequiredArgsConstructor;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;

@SpringBootApplication
@RequiredArgsConstructor
public class TodoServiceApplication {

    private final TodoRepository todoRepository;

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

    //Load dummy data
    @Bean
    public CommandLineRunner commandLineRunner() {
        if (todoRepository.count() == 0) {
            Todo todo = Todo.builder()
                    .email("alpha@knf.com")
                    .gender("Male")
                    .firstName("Alpha")
                    .lastName("Pro")
                    .build();
            return (args) -> todoRepository.save(todo);
        }
        return (args) -> System.out.println();
    }
}

Run the application and verify REST APIs

Step 1: mvn clean install


Step 2: Run the Spring Boot application - mvn spring-boot:run


2. Frontend Development

First, install the Vue CLI globally on the machine.

npm install -g @vue/cli
Then create the Vue CLI project inside a folder, where primevue-crud-app is our project name.

vue create primevue-crud-app
Now we will setup the PrimeVue library. First, in the same project folder, run the following command to install PrimeVue:

npm install primevue@latest --save
npm install primeicons --save
npm install primeflex --save

Final Project directory:


package.json

The package. json file contains descriptive and functional metadata about a project, such as a name, version, and dependencies. The file provides the npm package manager with various information to help identify the project and handle dependencies.
{
  "name": "primevue-crud-app",
  "version": "0.1.0",
  "private": true,
  "scripts": {
    "serve": "vue-cli-service serve",
    "build": "vue-cli-service build",
    "lint": "vue-cli-service lint"
  },
  "dependencies": {
    "@vuelidate/core": "^2.0.3",
    "@vuelidate/validators": "^2.0.4",
    "core-js": "^3.8.3",
    "primeflex": "^3.3.1",
    "primeicons": "^7.0.0",
    "primevue": "^3.52.0",
    "vue": "^3.2.13",
    "vue-router": "^4.3.2"
  },
  "devDependencies": {
    "@babel/core": "^7.12.16",
    "@babel/eslint-parser": "^7.12.16",
    "@vue/cli-plugin-babel": "~5.0.0",
    "@vue/cli-plugin-eslint": "~5.0.0",
    "@vue/cli-service": "~5.0.0",
    "eslint": "^7.32.0",
    "eslint-plugin-vue": "^8.0.3"
  },
  "eslintConfig": {
    "root": true,
    "env": {
      "node": true
    },
    "extends": [
      "plugin:vue/vue3-essential",
      "eslint:recommended"
    ],
    "parserOptions": {
      "parser": "@babel/eslint-parser"
    },
    "rules": {}
  },
  "browserslist": [
    "> 1%",
    "last 2 versions",
    "not dead",
    "not ie 11"
  ]
}

todoservice.js

The todoservice will be used to get the data from the backend by calling APIs. 

Path - src/views/services/todoservice.js

export async function getAllTodos() {
    // debugger
    const response = await fetch('http://localhost:8090/todos');
    return await response.json();
}

export async function createTodo(data) {
    const response = await fetch(`http://localhost:8090/todos`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(data)
    })
    return await response.json();
}

export async function updateTodo(data) {
    //TODO: Test this
    const response = await fetch(`http://localhost:8090/todos/` + data.id, {
        method: 'PUT',
        body: JSON.stringify(data),
        headers: { 'Content-type': 'application/json' }
    })
    return await response.json();
}

export async function deleteTodo(data) {
    //debugger
    const response = await fetch('http://localhost:8090/todos/' + data.id, {
        method: 'DELETE',
        headers: { 'Content-Type': 'application/json' }
    })
    return await response.json();
}

HomePage.vue

HomePage component which will be used to add, update, and List todo.

Path - src/views/HomePage.vue

<template>
  <div>
    <Dialog header="Add Todo" v-model:visible="addDialog" 
      :breakpoints="{'960px': '75vw', '640px': '90vw'}"
      :style="{width: '50vw'}" :modal="true">

      <TodoForm ref="addTodoFormRef" :forminp="addTodoInput">
        <template></template>
      </TodoForm>

      <template #footer>
        <Button label="Cancel" icon="pi pi-ban" @click="toggleAddDialog()" 
         class="p-button-text" style="margin-right:10px"></Button>
        <Button label="Save" icon="pi pi-check" @click="addTodoBtn()" autofocus></Button>
      </template>

    </Dialog>
  </div>
  <Dialog header="Edit Todo" v-model:visible="editDialog" 
   :breakpoints="{'960px': '75vw', '640px': '90vw'}"
    :style="{width: '50vw'}" :modal="true">

    <TodoForm ref="editTodoFormRef" :forminp="editTodoInput">
      <template></template>
    </TodoForm>

    <template #footer>
      <Button label="Cancel" icon="pi pi-ban" @click="hideEditDialog()" 
        class="p-button-text" style="margin-right:10px"></Button>
      <Button label="Edit" icon="pi pi-check" @click="editTodoBtn()" autofocus></Button>
    </template>
  </Dialog>

  <div>
    <DataTable :value="todos" :paginator="true" :rows="4" dataKey="id" 
      v-model:selection="selectedTodos" removableSort
      v-model:filters="filters" filterDisplay="row" :globalFilterFields="getColumnFields()">
      <template #header>
        <div class="flex justify-content-end">
          <span class="p-input-icon-left ">
            <i class="pi pi-search" />
            <InputText v-model="filters['global'].value" placeholder="Search" />
          </span>
        </div>
      </template>
      <Column v-for="col of columns" :field="col.field" filterField="col.field" 
        :header="col.header" :key="col.field"
        :sortable="true">
      </Column>
      <Column field="editor" header="Actions">
        <template #body="slotProps">
          <Button style="margin-right:10px" icon="pi pi-pencil" 
           class="p-button-rounded p-button-secondary"
            @click="showEditDialog(slotProps.data)"></Button>
          <Button icon="pi pi-trash" class="p-button-rounded p-button-danger"
            @click="removeTodo(slotProps.data)"></Button>
        </template>
      </Column>
    </DataTable>
  </div>
  <div>
    <Button style = "padding: 37px 37px;" title="Add Todo" icon="pi pi-plus-circle" 
      class="p-button-rounded" @click="toggleAddDialog()"></Button>
  </div>
</template>

<script setup>
//imports
import { getAllTodos, deleteTodo } from './services/todoservice.js';
import { ref, onMounted, reactive } from 'vue';
import TodoForm from '../components/TodoForm.vue';
import { FilterMatchMode } from 'primevue/api';
// columns
const columns = ref([
  { field: 'firstName', header: 'First-Name' },
  { field: 'lastName', header: 'Last-Name' },
  { field: 'email', header: 'Email' },
  { field: 'gender', header: 'Gender' }
]);
//vars
const addTodoFormRef = ref(null);
const editTodoFormRef = ref(null);
const selectedTodos = ref();
const todos = ref([]);
const editTodoInput = reactive({
  firstName: '',
  lastName: '',
  email: '',
  gender: ''
});
const addTodoInput = reactive({
  firstName: '',
  lastName: '',
  email: '',
  gender: ''
});
const editDialog = ref(false);
const addDialog = ref(false);

//filter stuff
const filters = ref({
  'global': { value: null, matchMode: FilterMatchMode.CONTAINS },
  'firstName': { value: null, matchMode: FilterMatchMode.STARTS_WITH },
  'lastName': { value: null, matchMode: FilterMatchMode.STARTS_WITH },
  'email': { value: null, matchMode: FilterMatchMode.CONTAINS },
  'gender': { value: null, matchMode: FilterMatchMode.EQUALS }
});
//helper and button functions
function getColumnFields() {
  let colfields = [];
  for (const element of columns.value) {
    colfields.push(element.field);
  }
  return colfields;
}
function updateTableContent() {
  getAllTodos().then(data => (todos.value = data));
}

function toggleAddDialog() {
  addDialog.value = !addDialog.value;
}

function showEditDialog(data) {
  editTodoInput.id = data.id;
  editTodoInput.firstName = data.firstName;
  editTodoInput.lastName = data.lastName;
  editTodoInput.email = data.email;
  editTodoInput.gender = data.gender;
  //
  editDialog.value = !editDialog.value;
}
function hideEditDialog() {
  editDialog.value = !editDialog.value;
}

async function removeTodo(data) {
 
  await deleteTodo(data);
  updateTableContent();
}

async function editTodoBtn() {
  const status = await editTodoFormRef.value.handleEditEvent();
  if (status) {
    hideEditDialog();
    await updateTableContent();
  }
}
async function addTodoBtn() {
  const status = await addTodoFormRef.value.handleAddEvent();
  if (status) {
    toggleAddDialog();
    await updateTableContent();
  }
}
onMounted(() => {
  getAllTodos().then(data => (todos.value = data));
})

</script>

TodoForm Component

Path - src/components/TodoForm.vue

<template>
   <div class="flex flex-wrap align-Todos-center mb-3 gap-2">
        <InputText placeholder="First Name" id="firstName"
          v-model="formTodos.firstName" @blur="v$.firstName.$touch" />
        <div class="input-errors" v-for="error of v$.firstName.$errors" :key="error.$uid">
            <div class="error-msg">{{ error.$message }}</div>
        </div>
    </div>

    <div class="flex flex-wrap align-Todos-center mb-3 gap-2">
        <InputText placeholder="Last Name" id="lastName" 
          v-model="formTodos.lastName" @blur="v$.lastName.$touch" />
        <div class="input-errors" v-for="error of v$.lastName.$errors" :key="error.$uid">
            <div class="error-msg">{{ error.$message }}</div>
        </div>
    </div>

    <div class="flex flex-wrap align-Todos-center mb-3 gap-2">
        <InputText placeholder="Email" id="email" type="email" 
          v-model="formTodos.email" @blur="v$.email.$touch" />
        <div class="input-errors" v-for="error of v$.email.$errors" :key="error.$uid">
            <div class="error-msg">{{ error.$message }}</div>
        </div>
    </div>

    <div class="flex flex-wrap align-Todos-center mb-3 gap-2">
        <InputText placeholder="Gender" id="gender" v-model="formTodos.gender" 
          @blur="v$.gender.$touch" />
        <div class="input-errors" v-for="error of v$.gender.$errors" :key="error.$uid">
            <div class="error-msg">{{ error.$message }}</div>
        </div>
    </div>
    
</template>

<script setup>

import { defineProps, defineExpose, onMounted, reactive } from 'vue';
import { createTodo, updateTodo } from '../views/services/todoservice.js';
import { useVuelidate } from '@vuelidate/core'
import { required, email } from '@vuelidate/validators'

const props = defineProps({
    forminp: {
        firstName: '',
        lastName: '',
        email: '',
        gender: '',
        id: ''
    }
});

const formTodos = reactive({
    firstName: '',
    lastName: '',
    email: '',
    gender: ''

})

const rules = {
    firstName: { required },
    lastName: { required },
    email: { email, required },
    gender: { required }
}
const v$ = useVuelidate(rules, formTodos)


//functions
function clearForm() {
    formTodos.firstName = '';
    formTodos.lastName = '';
    formTodos.email = '';
    formTodos.gender = '';
    formTodos.id = '';
}

async function handleEditEvent() {
   
    const isFormCorrect = await v$.value.$validate();
    if (!isFormCorrect) { return false; }
    await updateTodo(formTodos);
    clearForm();
    return true;
}
async function handleAddEvent() {
  
    const isFormCorrect = await v$.value.$validate();
    if (!isFormCorrect) { return false;}
    await createTodo(formTodos);
    clearForm();
    return true;
}

defineExpose({
    handleAddEvent,
    handleEditEvent
})
onMounted(() => {
    formTodos.firstName = props.forminp.firstName;
    formTodos.lastName = props.forminp.lastName;
    formTodos.email = props.forminp.email;
    formTodos.gender = props.forminp.gender;
    formTodos.id = props.forminp.id;
})
</script>

App Component

Path - src/App.vue

<template>
  <!---Dont need router for SPA but may be useful later-->
  <router-view />
</template>

<style>
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
}
</style>

index.js

Path - src/router/index.js

import { createRouter, createWebHistory } from 'vue-router'
import HomePage from '../views/HomePage.vue'

const routes = [
  {
    path: '/',
    name: 'home',
    component: HomePage
  }
]

const router = createRouter({
  history: createWebHistory(process.env.BASE_URL),
  routes
})

export default router

main.js

import "primeflex/primeflex.css";
import "primevue/resources/themes/mdc-light-deeppurple/theme.css";
import "primevue/resources/primevue.min.css";
import "primeicons/primeicons.css";

import PrimeVue from "primevue/config";

import Button from 'primevue/button';
import Dialog from 'primevue/dialog';
import InputText from 'primevue/inputtext';

import DataTable from "primevue/datatable"
import Column from 'primevue/column';
import ColumnGroup from 'primevue/columngroup';     
import Row from 'primevue/row';                     

import { createApp } from 'vue'
import App from './App.vue'
import router from './router'
const app = createApp(App)

app.use(router)
app.use(PrimeVue, { ripple: true })

app.component('DataTable', DataTable)
    .component('Column', Column)
    .component('ColumnGroup', ColumnGroup)
    .component('Row', Row)
    .component('Button', Button)
    .component('Dialog', Dialog)
    .component('InputText', InputText)


app.mount('#app')

Run the application

Step 1: npm install


Step 2: Run the Spring Boot application - npm run serve

From the browser call the endpoint http://localhost:8080

Download Source Code

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Example 1: Java 8 program to print odd numbers from a List   import java.util.Arrays; import java.util.List; import java.util.stream.Collectors; /*Java 8 Program to find Odd Numbers from a List*/ public class DriverClass { public static void main( String [] args) { List < Integer > numbers = Arrays. asList( 1 , 4 , 8 , 40 , 11 , 22 , 33 , 99 ); List < Integer > oddNumbers = numbers.stream(). filter(o -> o % 2 != 0 ). collect(Collectors.toList()); System.out.println(oddNumbers); } } 1. Initialize List using Arrays.asList() method. Java's built-in Arrays.asList() method converts an array into a list. This method takes an array as an argument and returns a List object. 2.  Java List interface provides stream() method which returns a sequential Stream with list of Integer as its source. 3. The Java stream filter(...
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Java Stream API - How to convert List of objects to another List of objects using Java streams?

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In this section, we will show you how to convert a List of objects to another List of objects in Java using the Java streams map(). The ‘map’ method maps each element to its corresponding result. Java Stream API   The Java Stream API provides a functional programming approach over the object oriented capabilities of Java. It is used for processing collections of objects. The Stream in Java can be defined as a sequence of elements from a source List, Set or Array. Most of the stream operations return a Stream. This avails engender a chain of stream operations(stream pipe-lining). The streams withal support the aggregate or terminal operations on the elements. for example, finding the sum or maximum element or finding the average etc...Stream operations can either be executed sequentially or parallel. when performed parallelly, it is called a parallel stream.   Stream map() Method   The Java 8 Stream map() is an intermediate operation. It converts Stream<obj1> to Str...
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Registration and Login with Spring Boot + Spring Security + Thymeleaf

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In this section, we will learn how to create user registration and login using Spring boot, Spring security, Thymeleaf, JPA, and H2DB. The GitHub repository link is provided at the end of this tutorial. You can download the source code. Technologies used: Spring Boot 2.5.5  Spring Data JPA  Spring Security  Thymeleaf  Maven 3+  Java 17  H2 Database   User Interface User Registration Authentication Failed Authentication success Sign out Final Project Structure: Complete 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-pare...
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Java, Spring Boot Mini Project - Library Management System - Download

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Hello everyone, Hope you are doing well. Here, we provide a Library Management System mini-project for beginners, it's free for download. Maybe you can build more on top of this project and create your own product, that's all about you. The source code download link is provided at the end of this post. 1. Benefit of this project You could cover the following technologies and features by learning and debugging this mini project. Java 17 Java Stream Java Lamda Expressions Java Records Functional programming Object-oriented programming var Keyword in Java Generics in Java Java Switch Spring boot 2.6.4 Spring Security Thymeleaf template engine OpenCSV Spring Data JPA Server Side Pagination H2 Database  Bootstrap HTML CSS and more... 2. Objective Of Spring Boot On Library Management System The main objective of this project is to manage the details of the books, author, category, and publisher. Only Admin/Librarian will manage all these activities. Also, they can export the data in ...
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ReactJS, Spring Boot JWT Authentication Example

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In this tutorial, we’ll create a user registration & login example using ReactJS, Spring Boot, Spring Security, and JWT authentication. You could download the source code from our Github repository, the download link is provided at the end of this tutorial. Technologies used Backend Technologies: Java 17 Spring Boot 2.7.0 Spring Security Spring Data JPA JWT H2 Database Frontend Technologies: React 17.0.1 Axios 0.27.2 Redux 4.0.5 Bootstrap 4.5.2 ReactJS - SpringBoot - JWT - Flow Backend Project Directory: Frontend Project Directory: Following is the screenshot of our application - User Registration: User Signin: Profile View: Access Resource: We will build two projects:  1. Backend:   spring-boot-security-jwt 2. Frontend: react-redux-jwt Project 1: spring-boot-security-jwt 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"...
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Top 5 Java ORM tools - 2024

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  The term ORM refers to object-relational mapping, which uses objects to adapt programming languages to database systems while allowing them to function with SQL and object-oriented programming ideas. Any kind of database management system that can accomplish object mapping to the table in the virtual system is suitable for the implementation of ORM. Java has a wide variety of ORM tools, some of which are mentioned below: 1. Hibernate Hibernate is a lightweight, open-source, non-invasive Java ORM (Object-Relational Mapping) framework that allows developers to create objects that function independently of database software and create persistence logic in any Java or JavaEE application. It offers an abstraction layer, so developers don't have to bother about implementations; Hibernate handles these tasks internally, such as connecting to databases and creating queries to carry out CRUD operations, among other things. Persistence logic development is done with it. Persistence logic r...
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Java - Blowfish Encryption and decryption Example

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Blowfish is an encryption method developed by Bruce Schneier in 1993 as an alternative to the DES encryption method. It is significantly faster than DES and provides good encryption speed, although no effective cryptanalysis technique has been found to date. It is one of the first secure block ciphers that is not protected by any patents and is therefore freely available for anyone to use. This is a symmetric block cipher algorithm. Block size: 64 bits Key size: variable size from 32 to 448 bits number of subsections: 18 [P-array] number of rounds: 16 number of substitution blocks: 4 [each with 512 records of 32 bits each] develop  Example 1: Encryption and decryption using Blowfish import java.io.UnsupportedEncodingException; import java.nio.charset.Charset; import java.security.InvalidKeyException; import java.security.NoSuchAlgorithmException; import java.util.Base64; import javax.crypto.BadPaddingException; import javax.crypto.Cipher; import javax.crypto.IllegalBlockSiz...
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Spring boot video streaming example-HTML5

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Hello everyone, Today we will learn how to stream MP4 video using Spring Boot and Spring Web Flux.  The Source code download link is provided at the end of this post. New, Quarkus Practice User Interface   Project Structure: G radle(build.gradle) plugins { id 'org.springframework.boot' version '2.5.4' id 'io.spring.dependency-management' version '1.0.11.RELEASE' id 'java' } group = 'com.knf.demo' version = '0.0.1-SNAPSHOT' sourceCompatibility = '11' repositories { mavenCentral() } dependencies { implementation 'org.springframework.boot:spring-boot-starter-webflux' testImplementation 'org.springframework.boot:spring-boot-starter-test' testImplementation 'io.projectreactor:reactor-test' } test { useJUnitPlatform() } Service (VideoStreamingService.java) package  com.knf.demo.service ; import org.springframework.beans.factory.annotation. Autowired ; import org.springframework...
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Google Cloud Storage + Spring Boot - File Upload, Download, and Delete

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In this section, we will learn  how to  create a simple spring boot application to perform different file operations such as upload, download, list, and delete files from the Google Cloud Storage. 1.  A little bit of Background Google Cloud Storage Cloud Storage is a managed service for storing unstructured data. Store any amount of data and retrieve it as often as you like. More Info - click here! Spring Boot Spring Boot makes it easy to create stand-alone, production-grade Spring-based Applications that you can "just run".  More Info - click here! 2. Create a GCP Project First, Sign into the Google console at  https://console.cloud.google.com . You can create a new project by first selecting the project dropdown in the top left and selecting " New Project ". Next, specify your GCP  Project name  and  Project ID . Then  Click on the " CREATE " button. Copy " Project ID " and keep it for future purposes. 3. Create a Google Cloud Storage bucke...
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