Go Lang + Angular + Mysql CRUD example - Go Full stack development

Hello everyone, today we will learn how to develop a full-stack web application that is a basic User Management Application using Angular, Go, and Mysql.GitHub repository link is provided at the end of this tutorial. You can download the source code.


After completing this tutorial what we will build?

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

• Create User
• List All Users 
• Update User 
• Delete User 
• View User 


We divided this tutorial into two parts 

PART 1 - Rest APIs Development using Go and Mysql 

PART 2 - UI development using Angular


PART 1 - Rest APIs Development using Go Language

These are APIs that the Go Language application will export:

GET all User's        :     /users 
GET User by ID     :     /users/{_id} 
POST User             :     /users 
PUT User               :     /users/{_id} 
DELETE User       :     /users/{_id}

Backend Project Structure:


Create database 'userdb':

CREATE DATABASE userdb;

Create table 'users':

CREATE TABLE `users` (
`id` bigint(20) UNSIGNED NOT NULL,
`first_name` varchar(200) NOT NULL,
`last_name` varchar(200) NOT NULL,
`email` varchar(200) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;


ALTER TABLE `users`
ADD PRIMARY KEY (`id`),
ADD UNIQUE KEY `id` (`id`);

ALTER TABLE `users`
MODIFY `id` bigint(20) UNSIGNED NOT NULL
AUTO_INCREMENT, AUTO_INCREMENT=11;

Initialize the Go project:

Initialize the Go project using the following command
go mod init backend

Adding the modules required for the project:

go get github.com/gorilla/mux
go get github.com/go-sql-driver/mysql

main.go

package main

import (
"database/sql"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"

_ "github.com/go-sql-driver/mysql"
"github.com/gorilla/mux"
)

func main() {
Routers()
}

func Routers() {
InitDB()
defer db.Close()
router := mux.NewRouter()
router.HandleFunc("/users",
GetUsers).Methods("GET")
router.HandleFunc("/users",
CreateUser).Methods("POST")
router.HandleFunc("/users/{id}",
GetUser).Methods("GET")
router.HandleFunc("/users/{id}",
UpdateUser).Methods("PUT")
router.HandleFunc("/users/{id}",
DeleteUser).Methods("DELETE")
http.ListenAndServe(":9080",
&CORSRouterDecorator{router})
}

/***************************************************/

//Get all users
func GetUsers(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
var users []User
result, err := db.Query("SELECT id, first_name," +
"last_name,email from users")
if err != nil {
panic(err.Error())
}
defer result.Close()
for result.Next() {
var user User
err := result.Scan(&user.ID, &user.FirstName,
&user.LastName, &user.Email)
if err != nil {
panic(err.Error())
}
users = append(users, user)
}
json.NewEncoder(w).Encode(users)
}

//Create user
func CreateUser(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
stmt, err := db.Prepare("INSERT INTO users(first_name," +
"last_name,email) VALUES(?,?,?)")
if err != nil {
panic(err.Error())
}
body, err := ioutil.ReadAll(r.Body)
if err != nil {
panic(err.Error())
}
keyVal := make(map[string]string)
json.Unmarshal(body, &keyVal)
first_name := keyVal["firstName"]
last_name := keyVal["lastName"]
email := keyVal["email"]
_, err = stmt.Exec(first_name, last_name, email)
if err != nil {
panic(err.Error())
}
fmt.Fprintf(w, "New user was created")
}

//Get user by ID
func GetUser(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
params := mux.Vars(r)
result, err := db.Query("SELECT id, first_name,"+
"last_name,email from users WHERE id = ?", params["id"])
if err != nil {
panic(err.Error())
}
defer result.Close()
var user User
for result.Next() {
err := result.Scan(&user.ID, &user.FirstName,
&user.LastName, &user.Email)
if err != nil {
panic(err.Error())
}
}
json.NewEncoder(w).Encode(user)
}

//Update user
func UpdateUser(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
params := mux.Vars(r)
stmt, err := db.Prepare("UPDATE users SET first_name = ?," +
"last_name= ?, email=? WHERE id = ?")
if err != nil {
panic(err.Error())
}
body, err := ioutil.ReadAll(r.Body)
if err != nil {
panic(err.Error())
}
keyVal := make(map[string]string)
json.Unmarshal(body, &keyVal)
first_name := keyVal["firstName"]
last_name := keyVal["lastName"]
email := keyVal["email"]
_, err = stmt.Exec(first_name, last_name, email,
params["id"])
if err != nil {
panic(err.Error())
}
fmt.Fprintf(w, "User with ID = %s was updated",
params["id"])
}

//Delete User
func DeleteUser(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
params := mux.Vars(r)
stmt, err := db.Prepare("DELETE FROM users WHERE id = ?")
if err != nil {
panic(err.Error())
}
_, err = stmt.Exec(params["id"])
if err != nil {
panic(err.Error())
}
fmt.Fprintf(w, "User with ID = %s was deleted",
params["id"])
}

/***************************************************/

type User struct {
ID string `json:"id"`
FirstName string `json:"firstName"`
LastName string `json:"lastName"`
Email string `json:"email"`
}

//Db configuration
var db *sql.DB
var err error

func InitDB() {
db, err = sql.Open("mysql",
"root:@tcp(127.0.0.1:3306)/userdb")
if err != nil {
panic(err.Error())
}
}

/***************************************************/

// CORSRouterDecorator applies CORS headers to a mux.Router
type CORSRouterDecorator struct {
R *mux.Router
}

func (c *CORSRouterDecorator) ServeHTTP(rw http.ResponseWriter,
req *http.Request) {
if origin := req.Header.Get("Origin"); origin != "" {
rw.Header().Set("Access-Control-Allow-Origin", origin)
rw.Header().Set("Access-Control-Allow-Methods",
"POST, GET, OPTIONS, PUT, DELETE")
rw.Header().Set("Access-Control-Allow-Headers",
"Accept, Accept-Language,"+
" Content-Type, YourOwnHeader")
}
// Stop here if its Preflighted OPTIONS request
if req.Method == "OPTIONS" {
return
}

c.R.ServeHTTP(rw, req)
}

Run:

go run main.go



PART 2 - UI development using Angular

Front Project Structure:


package.json 

A package.json is a JSON file that subsists at the root of a Javascript/Node project. It holds metadata pertinent to the project and is utilized for managing the project's dependencies, scripts, version, and a whole lot more.
{
"name": "frontend",
"version": "0.0.0",
"scripts": {
"ng": "ng",
"start": "ng serve",
"build": "ng build",
"test": "ng test",
"lint": "ng lint",
"e2e": "ng e2e"
},
"private": true,
"dependencies": {
"@angular/animations": "~10.1.2",
"@angular/common": "~10.1.2",
"@angular/compiler": "~10.1.2",
"@angular/core": "~10.1.2",
"@angular/forms": "~10.1.2",
"@angular/platform-browser": "~10.1.2",
"@angular/platform-browser-dynamic": "~10.1.2",
"@angular/router": "~10.1.2",
"bootstrap": "^4.5.3",
"jquery": "^3.5.1",
"rxjs": "~6.6.0",
"tslib": "^2.0.0",
"zone.js": "~0.10.2"
},
"devDependencies": {
"@angular-devkit/build-angular": "^0.1100.3",
"@angular/cli": "~10.1.2",
"@angular/compiler-cli": "~10.1.2",
"@types/jasmine": "~3.5.0",
"@types/jasminewd2": "~2.0.3",
"@types/node": "^12.11.1",
"codelyzer": "^6.0.0",
"jasmine-core": "~3.6.0",
"jasmine-spec-reporter": "~5.0.0",
"karma": "~5.0.0",
"karma-chrome-launcher": "~3.1.0",
"karma-coverage-istanbul-reporter": "~3.0.2",
"karma-jasmine": "~4.0.0",
"karma-jasmine-html-reporter": "^1.5.0",
"protractor": "~7.0.0",
"ts-node": "~8.3.0",
"tslint": "~6.1.0",
"typescript": "~4.0.2"
}
}

The User.ts file [User Model]

Path - src/app/user.ts
 
Before defining the UserListComponent, let’s define a User class for working with users. create a new file user.ts inside the src/app folder and add the following code to it -
export class User {
id: string;
firstName: string;
lastName: string;
email: string;
active: boolean;

}

Create User List Template and Component

User List Component

Let's create the UserListComponent component which will be used to display a list of users, create a new user, and delete a user. 

Path - src/app/user-list/user-list.component.ts
import { Observable } from "rxjs";
import { UserService } from "../user.service";
import { User } from "../user";
import { Component, OnInit } from "@angular/core";
import { Router } from '@angular/router';

@Component({
selector: "app-user-list",
templateUrl: "./user-list.component.html",
styleUrls: ["./user-list.component.css"]
})
export class UserListComponent implements OnInit {
users: Observable<User[]>;

constructor(private userService: UserService,
private router: Router) {}

ngOnInit() {
this.reloadData();
}

reloadData() {
this.users = this.userService.getUsersList();
}

deleteUser(id: string) {
this.userService.deleteUser(id)
.subscribe(
data => {
console.log(data);
this.reloadData();
},
error => console.log(error));
}
updateUser(id: string){
this.router.navigate(['update', id]);
}
userDetails(id: string){
this.router.navigate(['details', id]);
}
}

User List Template

Path - src/app/user-list/user-list.component.html 

Add user-list.component.html file with the following code to it -
<div class="panel panel-primary">
<div class="panel-heading">
<h2>User List</h2>
</div>
<div class="panel-body">
<table class="table table-striped">
<thead>
<tr>
<th>Firstname</th>
<th>Lastname</th>
<th>Email</th>
<th>Actions</th>
</tr>
</thead>
<tbody>
<tr *ngFor="let user of users | async">
<td>{{user.firstName}}</td>
<td>{{user.lastName}}</td>
<td>{{user.email}}</td>
<td>
<button (click)="updateUser(user.id)"
class="btn btn-warning"
style="margin-left: 10px">Update</button>
<button (click)="deleteUser(user.id)"
class="btn btn-danger"
style="margin-left: 10px">Delete</button>
<button (click)="userDetails(user.id)"
class="btn btn-info"
style="margin-left: 10px">Details</button>
</td>
</tr>
</tbody>
</table>
</div>
</div>

Create Add User Template and Component 

Add User Component 

Path - src/app/create-user/create-user.component.ts CreateUserComponent is used to create and handle new user form data. Add the following code to it -
import { UserService } from '../user.service';
import { User } from '../user';
import { Component, OnInit } from '@angular/core';
import { Router } from '@angular/router';

@Component({
selector: 'app-create-user',
templateUrl: './create-user.component.html',
styleUrls: ['./create-user.component.css']
})
export class CreateUserComponent implements OnInit {

user: User = new User();
submitted = false;

constructor(private userService: UserService,
private router: Router) { }

ngOnInit() {
}

newUser(): void {
this.submitted = false;
this.user = new User();
}

save() {
this.userService
.createUser(this.user).subscribe(data => {
console.log(data)
this.user = new User();
this.gotoList();
},
error => console.log(error));
}

onSubmit() {
this.submitted = true;
this.save();
}

gotoList() {
this.router.navigate(['/users']);
}
}

Create a User Template 

The create-user.component.html shows the add using HTML form. Add the following code to it - 

Path - src/app/create-user/create-user.component.html
<h3>Create User</h3>
<div [hidden]="submitted" style="width: 400px;">
<form (ngSubmit)="onSubmit()">
<div class="form-group">
<label for="name">First Name</label>
<input type="text" class="form-control"
id="firstName" required
[(ngModel)]="user.firstName" name="firstName">
</div>

<div class="form-group">
<label for="name">Last Name</label>
<input type="text" class="form-control"
id="lastName" required
[(ngModel)]="user.lastName" name="lastName">
</div>

<div class="form-group">
<label for="name">Email </label>
<input type="text" class="form-control"
id="email" required [(ngModel)]="user.email"
name="email">
</div>

<button type="submit"
class="btn btn-danger">Submit</button>
</form>
</div>

<div [hidden]="!submitted">
<h4>Successfully submitted!</h4>
</div>

Update User Template and Component 

Update User Component 

Path - src/app/update-user/update-user.component.ts 

UpdateUserComponent is used to update an existing user.
import { Component, OnInit } from '@angular/core';
import { User } from '../user';
import { ActivatedRoute, Router }
from '@angular/router';
import { UserService } from '../user.service';

@Component({
selector: 'app-update-user',
templateUrl: './update-user.component.html',
styleUrls: ['./update-user.component.css']
})
export class UpdateUserComponent implements OnInit {

id: string;
user: User;
updated = false;

constructor(private route: ActivatedRoute,
private router: Router,
private userService: UserService) { }

ngOnInit() {
this.user = new User();

this.id = this.route.snapshot.params['id'];
this.userService.getUser(this.id)
.subscribe(data => {
this.user = data;
}, error => console.log(error));
}

updateUser() {
this.userService.updateUser(this.id, this.user)
.subscribe(data => {
console.log(data);
this.user = new User();
this.gotoList();
}, error => console.log(error));
}

onSubmit() {
this.updateUser();
this.updated = true;
}

gotoList() {
this.router.navigate(['/users']);
}
}

Update User Template 

Path - src/app/update-user/update-user.component.html 

The update-user.component.html shows the updated user HTML form. Add the following code to this file -
<h3>Update User</h3>
<div style="width: 500px;">
<form (ngSubmit)="onSubmit()">
<div class="form-group">
<label for="name">First Name</label>
<input type="text" class="form-control"
id="firstName" required
[(ngModel)]="user.firstName" name="firstName">
</div>

<div class="form-group">
<label for="name">Last Name</label>
<input type="text" class="form-control"
id="lastName" required
[(ngModel)]="user.lastName" name="lastName">
</div>

<div class="form-group">
<label for="name">Email</label>
<input type="text" class="form-control"
id="email" required [(ngModel)]="user.email"
name="email">
</div>

<button type="submit" class="btn btn-success">
Submit</button>
</form>
</div>

<div [hidden]="!updated">
<h4>Successfully updated!</h4>
</div>

Create a View User Details Template and Component 

User Details Component 

Path - src/app/user-details/user-details.component.ts 

The UserDetailsComponent component is used to display a particular user detail. Add the following code to it -
import { User } from '../user';
import { Component, OnInit, Input }
from '@angular/core';
import { UserService } from '../user.service';
import { Router, ActivatedRoute }
from '@angular/router';

@Component({
selector: 'app-user-details',
templateUrl: './user-details.component.html',
styleUrls: ['./user-details.component.css']
})
export class UserDetailsComponent implements OnInit {

id: string;
user: User;

constructor(private route: ActivatedRoute,
private router: Router,
private userService: UserService) { }

ngOnInit() {
this.user = new User();

this.id = this.route.snapshot.params['id'];
console.log("gh"+this.id);
this.userService.getUser(this.id)
.subscribe(data => {
console.log(data)
this.user = data;
}, error => console.log(error));
}

list(){
this.router.navigate(['users']);
}
}

User Details Template 

Path - src/app/user-details/user-details.component.html 

The user-details.component.html displays a particular user detail. Add the following code to it
<h2>User Details</h2>

<hr/>
<div *ngIf="user">
<div>
<label><b>First Name: </b></label>
{{user.firstName}}
</div>
<div>
<label><b>Last Name: </b></label>
{{user.lastName}}
</div>
<div>
<label><b>Email: </b></label>
{{user.email}}
</div>
</div>

<br>
<br>
<button (click)="list()" class="btn btn-primary">
User List</button><br>

User Service 

Path - src/app/user.service.ts 

The UserService will be used to get the data from the backend by calling  APIs. Update the user.service.ts file inside src/app directory with the following code to it -
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable({
providedIn: 'root'
})
export class UserService {

private baseUrl = 'http://localhost:9080/users';

constructor(private http: HttpClient) { }

getUser(id: string): Observable<any> {
return this.http.get(`${this.baseUrl}/${id}`);
}

createUser(user: Object): Observable<Object> {
return this.http.post(`${this.baseUrl}`, user);
}

updateUser(id: string, value: any):
Observable<Object> {
return this.http.put(`${this.baseUrl}/${id}`,
value);
}

deleteUser(id: string): Observable<any> {
return this.http.delete(`${this.baseUrl}/${id}`,
{ responseType: 'text' });
}

getUsersList(): Observable<any> {
return this.http.get(`${this.baseUrl}`);
}
}

App Routing Module 

Path: /src/app/app.routing.module.ts 

Routing for the Angular app is configured as an array of Routes, each component is mapped to a path so the Angular Router knows which component to display based on the URL in the browser address bar.
import { UserDetailsComponent }
from './user-details/user-details.component';
import { CreateUserComponent }
from './create-user/create-user.component';
import { NgModule } from '@angular/core';
import { Routes, RouterModule }
from '@angular/router';
import {UserListComponent }
from './user-list/user-list.component';
import { UpdateUserComponent }
from './update-user/update-user.component';

const routes: Routes = [
{ path: '', redirectTo: 'user', pathMatch: 'full' },
{ path: 'users', component: UserListComponent },
{ path: 'add', component: CreateUserComponent },
{ path: 'update/:id', component: UpdateUserComponent },
{ path: 'details/:id', component: UserDetailsComponent },
];

@NgModule({
imports: [RouterModule.forRoot(routes)],
exports: [RouterModule]
})
export class AppRoutingModule { }

App Component 

Path: /src/app/app.component.ts 

The app component is the root component of the application, it defines the root tag of the app as with the selector property of the @Component decorator.
import { Component } from '@angular/core';

@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent {
title = 'Go Lang + Angular + Mongo DB CRUD ';
}

App Component Template 

Path: /src/app/app.component.html 

Defines the HTML template associated with the root AppComponent.
<nav class="navbar navbar-expand-sm
bg-success navbar-dark">
<!-- Links -->
<ul class="navbar-nav">
<li class="nav-item">
<a routerLink="users" class="nav-link"
routerLinkActive="active">User List</a>
</li>
<li class="nav-item">
<a routerLink="add" class="nav-link"
routerLinkActive="active">Add User</a>
</li>
</ul>
</nav>
<div class="container">
<br>
<h2 style="text-align: center;">{{title}}</h2>
<hr>
<div class="card">
<div class="card-body">
<router-outlet></router-outlet>
</div>
</div>
</div>

<footer class="footer">
<div class="container">
<span>All Rights Reserved
2022 @Knowledge Factory</span>
</div>
</footer>

App Module 

Path: /src/app/app.module.ts 

Defines the root module, named AppModule, that tells Angular how to assemble the application. Initially declares only the AppComponent.
import { BrowserModule }
from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { AppRoutingModule }
from './app-routing.module';
import { AppComponent } from './app.component';
import { CreateUserComponent }
from './create-user/create-user.component';
import { UserDetailsComponent }
from './user-details/user-details.component';
import { UserListComponent }
from './user-list/user-list.component';
import { UpdateUserComponent }
from './update-user/update-user.component';
import { HttpClientModule }
from '@angular/common/http';
@NgModule({
declarations: [
AppComponent,
CreateUserComponent,
UserDetailsComponent,
UserListComponent,
UpdateUserComponent
],
imports: [
BrowserModule,
AppRoutingModule,
FormsModule,
HttpClientModule
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }

index.html 

Path: /src/index.html 

The main index.html file is the initial page loaded by the browser that kicks everything off.
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>AngularGoCRUD</title>
<base href="/">
<meta name="viewport"
content="width=device-width, initial-scale=1">
<link rel="icon" type="image/x-icon"
href="favicon.ico">
</head>
<body>
<app-root></app-root>
</body>
</html>

Main/Bootstrap File 

Path: /src/main.ts 

The main file is the entry point used by angular to launch and bootstrap the application.
import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic }
from '@angular/platform-browser-dynamic';

import { AppModule } from './app/app.module';
import { environment }
from './environments/environment';

if (environment.production) {
enableProdMode();
}

platformBrowserDynamic().bootstrapModule(AppModule)
.catch(err => console.error(err));

Frontend local setup

Step 1: The npm install installs all modules that are listed on package.json file and their
dependencies
npm install
Step 2: Run the Frontend application
ng serve
Hit http://localhost:4200 link in a browser that will host this Angular CRUD app.


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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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Spring Boot + Mockito simple application with 100% code coverage

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In this article, we will show you a simple  Spring Boot example to demonstrate test methods for Controllers, Service, and Repository, And code coverage analysis using the EclEmma plugin. Technologies used: Spring Boot 2.6.4 Mockito 3.11.2 Maven 3+ EclEmma plugin Junit 5 Java 17 A quick overview of  Spring Boot, Mockito, and EclEmma plugin Spring boot: Spring boot to develop REST web services and microservices. Spring Boot has taken the Spring framework to the next level. It has drastically reduced the configuration and setup time required for spring projects. We can set up a project with almost zero configuration and start building the things that actually matter to your application. Mockito: Mockito is a mocking framework, a JAVA-predicated library that is utilized for efficacious unit testing of JAVA applications. Mockito is utilized to mock interfaces so that a dummy functionality can be integrated into a mock interface that can be utilized in unit testing. EclEmma : E
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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.IllegalBlockSizeExc
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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.springframew
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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 bucket Fr
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