React JS + Spring Boot - Hello World Example

In the section, we will create a project for Hello Word Example with Spring Boot and React JS.

Part 1 - Backend development

Step 1: Creating a simple spring boot web application. 

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 helloworld. Here I selected the Maven project - language Java - Spring Boot 3.0.1 and add Spring web dependency.


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

Step 2: Import the project on your favourite IDE, I am using IntelliJ IDEA

Final Project Directory:


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>3.0.1</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.knf.dev.demo</groupId>
   <artifactId>helloworld</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>helloworld</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-web</artifactId>
      </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>



HelloWorldController.java

package com.knf.dev.demo.helloworld.controller;

import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@CrossOrigin(origins = "*", maxAge = 4800)
@RestController
@RequestMapping("/api/v1/")
public class HelloWorldController {

    @GetMapping("/hello")
    public String hello() {
        return "Hello World";
    }
}


HelloworldApplication.java

package com.knf.dev.demo.helloworld;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class HelloworldApplication {

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

Step 3: Test the APIs using postman



Part 2: Frontend Development

Step 1: Install Node.js 

To check if node.js is installed on your system, type node -v in the terminal. This will help you see the version of node.js currently installed on your system.


If it does not print anything, install node.js on your system. To install node.js, go to the homepage, https://nodejs.org/en/download/ of node.js, and install the package based on your OS.

Based on your OS, install the required package. Once node.js is installed, npm will also get installed along with it. To check if npm is installed or not, type npm –v in the terminal as given below. It will display the version of the npm.


Step 2:create-react-app 

We don't want to configure React manually, because it is complicated and takes a lot of time. create-react-app is a much easier way which does all the configuration and necessary package installations for us automatically and starts a new React app locally, ready for development. 
Another advantage of using create-react-app is that you don't have to deal with Babel or Webpack configurations. All of the necessary configurations will be made by create-react-app for us. 
In order to install your app, first, go to your workspace  and run the following command: 
npx create-react-app my-app

The installation process may take a few minutes. After it is done, you should see a folder that appears in your workspace with the name you gave to your app. Once it is successfully installed, You should get a similar output:


Step 3: Install Axios

npm install axios

Final Project Directory



package.json

{
  "name": "my-app",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@testing-library/jest-dom": "^5.16.5",
    "@testing-library/react": "^13.4.0",
    "@testing-library/user-event": "^13.5.0",
    "axios": "^1.2.2",
    "react": "^18.2.0",
    "react-dom": "^18.2.0",
    "react-scripts": "5.0.1",
    "web-vitals": "^2.1.4"
  },
  "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"
    ]
  }
}

HelloWorldService.js

import axios from 'axios';

const USER_API_BASE_URL = "http://localhost:8080/api/v1/";

class HelloWorldService {

    getMessage(){
        return axios.get(USER_API_BASE_URL+"hello");
    }
}

export default new HelloWorldService()


ViewMessageComponent.js

import React, { Component } from 'react'
import HelloWorldService from '../services/HelloWorldService'

class ViewMessageComponent extends Component {
    constructor(props) {
        super(props);
        this.state = {message: ''};
    }

    componentDidMount() {
        HelloWorldService.getMessage().then(res => {
            this.setState({ message: res.data });
        })
    }

    render() {
        return (
            <div>
                <div> {this.state.message}</div>
            </div>
        )
    }
}

export default ViewMessageComponent


App.js

import ViewMessageComponent from './components/ViewMessageComponent';

function App() {
  return (
    <div>
      <ViewMessageComponent />
    </div>
  );
}

export default App;


Run the application

Step 1: 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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