Spring Boot + ReactJS: React Table Pagination Example

Hello everyone, Today we will learn how to develop a simple Spring Boot, React, Data table Pagination application.




Technologies Used:

Backend:

  • Java 17
  • Spring Boot 2.7.0
  • Spring Data JPA
  • H2 Database

Frontend:

  • React 17.0.1
  • Axios 0.27.2
  • Bootstrap 4.6.0
  • React table 7.8.0

Features:

  • Add User
  • Update User
  • Delete User
  • View User
  • Search users by country
  • Server-side pagination

Backend Project Directory:



Frontend Project Directory:



We will build two projects: 

1. Backend:  springboot-pagination
2. Frontend: react-datatable-pagination



Project 1: springboot-pagination

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>2.7.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.knf.dev.demo</groupId>
    <artifactId>springboot-pagination</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot-pagination</name>
    <description>Demo project for Spring Boot</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>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>
    </dependencies>

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

</project>



User.java 

@Entity
@Table(name = "userData")
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    @Column(name = "name")
    private String name;
    @Column(name = "country")
    private String country;
    @Column(name = "email")
    private String email;

    public Long getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getCountry() {
        return country;
    }

    public void setCountry(String country) {
        this.country = country;
    }

    public String getEmail() {
        return email;
    }

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

    public User(Long id, String name, 
               String country, String email) {
        super();
        this.id = id;
        this.name = name;
        this.country = country;
        this.email = email;
    }

    public User() {
        super();
    }
}



UserRepository.java

public interface UserRepository 
                       extends JpaRepository<User, Long> {

    Page<User> findByCountryContaining
                   (String country, Pageable pageable);

}



ResourceNotFoundException.java

public class ResourceNotFoundException extends RuntimeException {

    private static final long serialVersionUID = 1L;

    public ResourceNotFoundException(String message) {
        super(message);
    }
}



ServerError.java

public class ServerError extends RuntimeException {

    private static final long serialVersionUID = 1L;

    public ServerError(String message) {
        super(message);
    }

}



GlobalExceptionHandler.java

@ControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(ResourceNotFoundException.class)
    public ResponseEntity<String> 
             resourceNotFound(Exception e, WebRequest request)

    {
        return new ResponseEntity<String>
             (e.getMessage(), HttpStatus.NOT_FOUND);
    }
}



UserController.java

@CrossOrigin(origins = "*")
@RestController
@RequestMapping("/api/v1/")
public class UserController {

    @Autowired
    UserRepository userRepsoitory;

    @GetMapping("/users")
    public Map<String, Object> getAllUsers(
        @RequestParam(value = "country", required = false) 
                                                  String country,
        @RequestParam(value = "page", defaultValue = "0") int page,
        @RequestParam(value = "size", defaultValue = "4") int size) {
        try {

            List<User> users = new ArrayList<User>();
            Pageable pagination = PageRequest.of(page, size);
            Page<User> userPage;
            if (country == null) {
                userPage = userRepsoitory.findAll(pagination);
            } else {
                userPage = userRepsoitory
                      .findByCountryContaining(country, pagination);
            }
            users = userPage.getContent();
            Map<String, Object> response = 
                        new HashMap<String, Object>();
            response.put("users", users);
            response.put("totalPages", userPage.getTotalPages());
            return response;
        } catch (Exception e) {
            throw new ServerError(e.getMessage());
        }

    }

    @PostMapping("/users")
    public User addUser(@RequestBody User user) {

        return userRepsoitory.save(user);
    }

    @PutMapping("/users/{id}")
    public User updateUser(@PathVariable("id") Long id, 
                 @RequestBody User user) {

        User userDetails = userRepsoitory.findById(id)
                .orElseThrow(() -> new ResourceNotFoundException
                          ("User Not Found"));
        userDetails.setCountry(user.getCountry());
        userDetails.setEmail(user.getEmail());
        userDetails.setName(user.getName());

        return userRepsoitory.save(userDetails);
    }

    @DeleteMapping("users/{id}")
    public Boolean deleteUser(@PathVariable("id") Long id) {

        User user = userRepsoitory.findById(id)
                .orElseThrow(() -> new ResourceNotFoundException
                      ("User Not Found"));
        userRepsoitory.delete(user);

        return true;
    }

    @GetMapping("users/{id}")
    public User findById(@PathVariable("id") Long id) {

        User user = userRepsoitory.findById(id)
              .orElseThrow(() -> new ResourceNotFoundException
                       ("User Not Found"));
        return user;
    }
}



Spring Boot Main Driver

@SpringBootApplication
public class SpringbootPaginationApplication {

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





Project 2: react-datatable-pagination

package.json

{
  "name": "react-datatable-pagination",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@material-ui/core": "^4.11.3",
    "@material-ui/lab": "^4.0.0-alpha.57",
    "@testing-library/jest-dom": "^5.11.4",
    "@testing-library/react": "^11.1.0",
    "@testing-library/user-event": "^12.1.10",
    "@fortawesome/fontawesome-free": "^5.15.3",
    "axios": "^0.27.2",
    "bootstrap": "^4.6.0",
    "react": "^17.0.1",
    "react-dom": "^17.0.1",
    "react-router-dom": "^5.2.0",
    "react-scripts": "5.0.1",
    "react-table": "^7.8.0",
    "web-vitals": "^1.0.1"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": [
      "react-app",
      "react-app/jest"
    ]
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  }
}



/services/UserService.js

import http from "../http-common";

const get = (id) => {
  return http.get(`/users/${id}`);
};

const create = (data) => {
  return http.post("/users", data);
};

const update = (id, data) => {
  return http.put(`/users/${id}`, data);
};

const remove = (id) => {
  return http.delete(`/users/${id}`);
};

const getAll = (params) => {
  return http.get("/users", { params });
};

const UserService = {
  getAll,
  get,
  create,
  update,
  remove
};

export default UserService;



/components/User.js

import React, { useState, useEffect } from "react";
import UserDataService from "../services/UserService";

const User = props => {
  const initialUserState = {
    id: null,
    country: "",
    email: "",
    name: ""
  };
  const [currentUser, setCurrentUser] = useState(initialUserState);
  const [message, setMessage] = useState("");

  const getUser = id => {
    UserDataService.get(id)
      .then(response => {
        setCurrentUser(response.data);
        console.log(response.data);
      })
      .catch(e => {
        console.log(e);
      });
  };

  useEffect(() => {
    getUser(props.match.params.id);
  }, [props.match.params.id]);

  const handleInputChange = event => {
    const { name, value } = event.target;
    setCurrentUser({ ...currentUser, [name]: value });
  };


  const updateUser = () => {
    UserDataService.update(currentUser.id, currentUser)
      .then(response => {
        console.log(response.data);
        setMessage("The User was updated successfully!");
      })
      .catch(e => {
        console.log(e);
      });
  };

  const deleteUser = () => {
    UserDataService.remove(currentUser.id)
      .then(response => {
        console.log(response.data);
        props.history.push("/Users");
      })
      .catch(e => {
        console.log(e);
      });
  };

  return (
    <div>
      {currentUser ? (
        <div className="edit-form">
          <h4>User</h4>
          <form>
            <div className="form-group">
              <label htmlFor="title">Name</label>
              <input
                type="text"
                className="form-control"
                id="name"
                name="name"
                value={currentUser.name}
                onChange={handleInputChange}
              />
            </div>
            <div className="form-group">
              <label htmlFor="email">Email</label>
              <input
                type="text"
                className="form-control"
                id="email"
                name="email"
                value={currentUser.email}
                onChange={handleInputChange}
              />
            </div>
            <div className="form-group">
              <label htmlFor="country">Country</label>
              <input
                type="text"
                className="form-control"
                id="country"
                name="country"
                value={currentUser.country}
                onChange={handleInputChange}
              />
            </div>

          </form>


          <button type="button" onClick={deleteUser} 
          class="btn btn-danger btn-sm">Delete</button>&nbsp;
          <button type="button" onClick={updateUser} 
              class="btn btn-success btn-sm">Update</button>



          <strong><p class="text-success">{message}</p></strong>


        </div>
      ) : (
        <div>
          <br />
          <p>Click on a User...</p>
        </div>
      )}
    </div>
  );
};

export default User;



/components/AddUser.js

import React, { useState } from "react";
import UserDataService from "../services/UserService";

const AddUser = () => {
  const initialUserState = {
    id: null,
    country: "",
    email: "",
    name: ""
  };
  const [User, setUser] = useState(initialUserState);
  const [submitted, setSubmitted] = useState(false);

  const handleInputChange = event => {
    const { name, value } = event.target;
    setUser({ ...User, [name]: value });
  };

  const saveUser = () => {
    var data = {
      name: User.name,
      email: User.email,
      country: User.country
    };

    UserDataService.create(data)
      .then(response => {
        setUser({
          id: response.data.id,
          name: response.data.name,
          email: response.data.email,
          country: response.data.country
        });
        setSubmitted(true);
        console.log(response.data);
      })
      .catch(e => {
        console.log(e);
      });
  };

  const newUser = () => {
    setUser(initialUserState);
    setSubmitted(false);
  };

  return (
    <div className="edit-form">
      {submitted ? (
        <div>
          <strong><p class="text-success">Registration Successsful!
                                 </p></strong>
          <button className="btn btn-success" onClick={newUser}>
            Add
          </button>
        </div>
      ) : (
        <div>
          <div className="form-group">
            <label htmlFor="name">Name</label>
            <input
              type="name"
              className="form-control"
              id="name"
              required
              value={User.name}
              onChange={handleInputChange}
              name="name"
            />
          </div>

          <div className="form-group">
            <label htmlFor="email">Email</label>
            <input
              type="text"
              className="form-control"
              id="email"
              required
              value={User.email}
              onChange={handleInputChange}
              name="email"
            />
          </div>

          <div className="form-group">
            <label htmlFor="country">Country</label>
            <input
              type="text"
              className="form-control"
              id="country"
              required
              value={User.country}
              onChange={handleInputChange}
              name="country"
            />
          </div>

          <button onClick={saveUser} className="btn btn-success">
            Submit
          </button>
        </div>
      )}
    </div>
  );
};

export default AddUser;



/components/UsersList.js

import React, { useState, useEffect, useMemo, useRef } from "react";
import Pagination from "@material-ui/lab/Pagination";
import UserDataService from "../services/UserService";
import { useTable } from "react-table";

const UsersList = (props) => {
  const [users, setUsers] = useState([]);
  const [searchCountry, setSearchCountry] = useState("");
  const usersRef = useRef();

  const [page, setPage] = useState(1);
  const [count, setCount] = useState(0);
  const [pageSize, setPageSize] = useState(4);

  const pageSizes = [4, 8, 12];

  usersRef.current = users;

  const onChangeSearchCountry = (e) => {
    const searchCountry = e.target.value;
    setSearchCountry(searchCountry);
  };

  const getRequestParams = (searchCountry, page, pageSize) => {
    let params = {};

    if (searchCountry) {
      params["country"] = searchCountry;
    }

    if (page) {
      params["page"] = page - 1;
    }

    if (pageSize) {
      params["size"] = pageSize;
    }

    return params;
  };

  const retrieveUsers = () => {
    const params = getRequestParams(searchCountry, page, pageSize);

    UserDataService.getAll(params)
      .then((response) => {
        const { users, totalPages } = response.data;

        setUsers(users);
        setCount(totalPages);

        console.log(response.data);
      })
      .catch((e) => {
        console.log(e);
      });
  };

  useEffect(retrieveUsers, [page, pageSize]);

  const findByCountry = () => {
    setPage(1);
    retrieveUsers();
  };

  const openUser = (rowIndex) => {
    const id = usersRef.current[rowIndex].id;

    props.history.push("/users/" + id);
  };

  const deleteUser = (rowIndex) => {
    const id = usersRef.current[rowIndex].id;

    UserDataService.remove(id)
      .then((response) => {
        props.history.push("/users");

        let newUsers = [...usersRef.current];
        newUsers.splice(rowIndex, 1);

        setUsers(newUsers);
      })
      .catch((e) => {
        console.log(e);
      });
  };

  const handlePageChange = (event, value) => {
    setPage(value);
  };

  const handlePageSizeChange = (event) => {
    setPageSize(event.target.value);
    setPage(1);
  };

  const columns = useMemo(
    () => [
      {
        Header: "Name",
        accessor: "name",
      },
      {
        Header: "Email",
        accessor: "email",
      },
      {
        Header: "Country",
        accessor: "country",
      },
      {
        Header: "Actions",
        accessor: "actions",
        Cell: (props) => {
          const rowIdx = props.row.id;
          return (
            <div>
              <span onClick={() => openUser(rowIdx)}>
                <button type="button" 
                   class="btn btn-warning btn-sm">Edit</button>
              </span>
              &nbsp;
              <span onClick={() => deleteUser(rowIdx)}>
                <button type="button" 
                  class="btn btn-danger btn-sm">Delete</button>
              </span>
            </div>
          );
        },
      },
    ],
    []
  );

  const {
    getTableProps,
    getTableBodyProps,
    headerGroups,
    rows,
    prepareRow,
  } = useTable({
    columns,
    data: users,
  });

  return (
    <div className="list row">


      <div className="col-md-8">
        <div className="input-group mb-3">
          <input
            type="text"
            className="form-control"
            placeholder="Search by country"
            value={searchCountry}
            onChange={onChangeSearchCountry}
          />
          <div className="input-group-append">
            <button
              className="btn btn-outline-success"
              type="button"
              onClick={findByCountry}
            >
              Search
            </button>
          </div>
        </div>
      </div>




      <div className="col-md-12 list">
        <div className="mt-3">
          {"Items per Page: "}
          <select onChange={handlePageSizeChange} value={pageSize}>
            {pageSizes.map((size) => (
              <option key={size} value={size}>
                {size}
              </option>
            ))}
          </select>

          <Pagination
            color="primary"
            className="my-3"
            count={count}
            page={page}
            siblingCount={1}
            boundaryCount={1}
            variant="outlined"
            onChange={handlePageChange}
          />
        </div>

        <table
          className="table table-striped table-bordered"
          {...getTableProps()}
        >
          <thead>
            {headerGroups.map((headerGroup) => (
              <tr {...headerGroup.getHeaderGroupProps()}>
                {headerGroup.headers.map((column) => (
                  <th {...column.getHeaderProps()}>
                    {column.render("Header")}
                  </th>


                ))}
              </tr>
            ))}
          </thead>
          <tbody {...getTableBodyProps()}>
            {rows.map((row, i) => {
              prepareRow(row);
              return (
                <tr {...row.getRowProps()}>
                  {row.cells.map((cell) => {
                    return (
                      <td {...cell.getCellProps()}>
                            {cell.render("Cell")}</td>
                    );
                  })}
                </tr>
              );
            })}
          </tbody>
        </table>

        <div className="mt-3">
          {"Items per Page: "}
          <select onChange={handlePageSizeChange} value={pageSize}>
            {pageSizes.map((size) => (
              <option key={size} value={size}>
                {size}
              </option>
            ))}
          </select>

          <Pagination
            color="primary"
            className="my-3"
            count={count}
            page={page}
            siblingCount={1}
            boundaryCount={1}
            variant="outlined"
            onChange={handlePageChange}
          />
        </div>


      </div>
    </div>
  );
};

export default UsersList;



http-common.js

import axios from "axios";

export default axios.create({
  baseURL: "http://localhost:8080/api/v1",
  headers: {
    "Content-type": "application/json"
  }
});



App.js

import React from "react";
import { Switch, Route, Link } from "react-router-dom";
import "bootstrap/dist/css/bootstrap.min.css";
import "./App.css";
import "@fortawesome/fontawesome-free/css/all.css";
import "@fortawesome/fontawesome-free/js/all.js";

import AddUser from "./components/AddUser";
import User from "./components/User";
import UsersList from "./components/UsersList";

function App() {
  return (
    <div>
      <nav className="navbar navbar-expand navbar-light bg-light">
        <a href="/users" className="navbar-brand">
          KnowledgeFactory
        </a>
        <div className="navbar-nav mr-auto">
          <li className="nav-item">
            <Link to={"/users"} className="nav-link">
              Users
            </Link>
          </li>
          <li className="nav-item">
            <Link to={"/add"} className="nav-link">
              Add User
            </Link>
          </li>
        </div>
      </nav>

      <div className="container mt-3">
        <Switch>
          <Route exact path={["/", "/users"]} 
                     component={UsersList} />
          <Route exact path="/add" component={AddUser} />
          <Route path="/users/:id" component={User} />
        </Switch>
      </div>
    </div>
  );
}

export default App;



App.css

.list .action {
  cursor: pointer;
}

.submit-form {
  max-width: 4ex;
  margin: auto;
}

.edit-form {
  max-width: 400px;
  margin: auto;
}



index.js

import React from "react";
import ReactDOM from "react-dom";
import { BrowserRouter } from "react-router-dom";

import App from "./App";
import reportWebVitals from './reportWebVitals';

ReactDOM.render(
  <BrowserRouter>
    <App />
  </BrowserRouter>,
  document.getElementById("root")
);

reportWebVitals();



index.css

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 
             'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 
              'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

code {
  font-family: source-code-pro, Menlo, Monaco, Consolas, 
         'Courier New',
    monospace;
}


Download the complete source code - click here

                                        

Local Setup and Run the application

Step1: Download or clone the source code from GitHub to a local machine - Click here


Backend


Step 2: mvn clean install


Step 3: Run the Spring Boot application - mvn spring-boot:run


Frontend


Step 4: npm install


Step 5: npm start

From the browser call the endpoint http://localhost:3000/

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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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