BAEL-4842 - Use React and Spring Boot to Build a Simple CRUD App

Initial source module for the article

spring-boot-modules/spring-boot-react/frontend/src/App.css

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+.App {
+  text-align: center;
+}
+
+.App-logo {
+  height: 40vmin;
+  pointer-events: none;
+}
+
+@media (prefers-reduced-motion: no-preference) {
+  .App-logo {
+    animation: App-logo-spin infinite 20s linear;
+  }
+}
+
+.App-header {
+  background-color: #282c34;
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  font-size: calc(10px + 2vmin);
+  color: white;
+}
+
+.App-link {
+  color: #61dafb;
+}
+
+@keyframes App-logo-spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}
+
+.container, .container-fluid {
+  margin-top: 20px;
+}

spring-boot-modules/spring-boot-react/frontend/src/App.js

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+import React, { Component } from 'react';
+import './App.css';
+import Home from './Home';
+import { BrowserRouter as Router, Route, Switch } from 'react-router-dom';
+import ClientList from './ClientList';
+import ClientEdit from "./ClientEdit";
+
+class App extends Component {
+  render() {
+    return (
+        <Router>
+          <Switch>
+            <Route path='/' exact={true} component={Home}/>
+            <Route path='/clients' exact={true} component={ClientList}/>
+            <Route path='/clients/:id' component={ClientEdit}/>
+          </Switch>
+        </Router>
+    )
+  }
+}
+
+export default App;

spring-boot-modules/spring-boot-react/frontend/src/App.test.js

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+import { render, screen } from '@testing-library/react';
+import App from './App';
+
+test('renders learn react link', () => {
+  render(<App />);
+  const linkElement = screen.getByText(/learn react/i);
+  expect(linkElement).toBeInTheDocument();
+});

spring-boot-modules/spring-boot-react/frontend/src/AppNavbar.js

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+import React, {Component} from 'react';
+import {Navbar, NavbarBrand} from 'reactstrap';
+import {Link} from 'react-router-dom';
+
+export default class AppNavbar extends Component {
+    constructor(props) {
+        super(props);
+        this.state = {isOpen: false};
+        this.toggle = this.toggle.bind(this);
+    }
+
+    toggle() {
+        this.setState({
+            isOpen: !this.state.isOpen
+        });
+    }
+
+    render() {
+        return <Navbar color="dark" dark expand="md">
+            <NavbarBrand tag={Link} to="/">Home</NavbarBrand>
+        </Navbar>;
+    }
+}

spring-boot-modules/spring-boot-react/frontend/src/ClientEdit.js

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+import React, { Component } from 'react';
+import { Link, withRouter } from 'react-router-dom';
+import { Button, Container, Form, FormGroup, Input, Label } from 'reactstrap';
+import AppNavbar from './AppNavbar';
+
+class ClientEdit extends Component {
+
+    emptyItem = {
+        name: '',
+        email: ''
+    };
+
+    constructor(props) {
+        super(props);
+        this.state = {
+            item: this.emptyItem
+        };
+        this.handleChange = this.handleChange.bind(this);
+        this.handleSubmit = this.handleSubmit.bind(this);
+    }
+
+    async componentDidMount() {
+        if (this.props.match.params.id !== 'new') {
+            const client = await (await fetch(`/clients/${this.props.match.params.id}`)).json();
+            this.setState({item: client});
+        }
+    }
+
+    handleChange(event) {
+        const target = event.target;
+        const value = target.value;
+        const name = target.name;
+        let item = {...this.state.item};
+        item[name] = value;
+        this.setState({item});
+    }
+
+    async handleSubmit(event) {
+        event.preventDefault();
+        const {item} = this.state;
+
+        await fetch('/clients' + (item.id ? '/' + item.id : ''), {
+            method: (item.id) ? 'PUT' : 'POST',
+            headers: {
+                'Accept': 'application/json',
+                'Content-Type': 'application/json'
+            },
+            body: JSON.stringify(item),
+        });
+        this.props.history.push('/clients');
+    }
+
+    render() {
+        const {item} = this.state;
+        const title = <h2>{item.id ? 'Edit Client' : 'Add Client'}</h2>;
+
+        return <div>
+            <AppNavbar/>
+            <Container>
+                {title}
+                <Form onSubmit={this.handleSubmit}>
+                    <FormGroup>
+                        <Label for="name">Name</Label>
+                        <Input type="text" name="name" id="name" value={item.name || ''}
+                               onChange={this.handleChange} autoComplete="name"/>
+                    </FormGroup>
+                    <FormGroup>
+                        <Label for="email">Email</Label>
+                        <Input type="text" name="email" id="email" value={item.email || ''}
+                               onChange={this.handleChange} autoComplete="email"/>
+                    </FormGroup>
+                    <FormGroup>
+                        <Button color="primary" type="submit">Save</Button>{' '}
+                        <Button color="secondary" tag={Link} to="/clients">Cancel</Button>
+                    </FormGroup>
+                </Form>
+            </Container>
+        </div>
+    }
+}
+
+export default withRouter(ClientEdit);

spring-boot-modules/spring-boot-react/frontend/src/ClientList.js

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+import React, { Component } from 'react';
+import { Button, ButtonGroup, Container, Table } from 'reactstrap';
+import AppNavbar from './AppNavbar';
+import { Link } from 'react-router-dom';
+
+class ClientList extends Component {
+
+    constructor(props) {
+        super(props);
+        this.state = {clients: [], isLoading: true};
+        this.remove = this.remove.bind(this);
+    }
+
+    componentDidMount() {
+        this.setState({isLoading: true});
+
+        fetch('/clients')
+            .then(response => response.json())
+            .then(data => this.setState({clients: data, isLoading: false}));
+    }
+
+    async remove(id) {
+        await fetch(`/clients/${id}`, {
+            method: 'DELETE',
+            headers: {
+                'Accept': 'application/json',
+                'Content-Type': 'application/json'
+            }
+        }).then(() => {
+            let updatedClients = [...this.state.clients].filter(i => i.id !== id);
+            this.setState({clients: updatedClients});
+        });
+    }
+
+    render() {
+        const {clients, isLoading} = this.state;
+
+        if (isLoading) {
+            return <p>Loading...</p>;
+        }
+
+        const clientList = clients.map(client => {
+            return <tr key={client.id}>
+                <td style={{whiteSpace: 'nowrap'}}>{client.name}</td>
+                <td>{client.email}</td>
+                <td>
+                    <ButtonGroup>
+                        <Button size="sm" color="primary" tag={Link} to={"/clients/" + client.id}>Edit</Button>
+                        <Button size="sm" color="danger" onClick={() => this.remove(client.id)}>Delete</Button>
+                    </ButtonGroup>
+                </td>
+            </tr>
+        });
+
+        return (
+            <div>
+                <AppNavbar/>
+                <Container fluid>
+                    <div className="float-right">
+                        <Button color="success" tag={Link} to="/clients/new">Add Client</Button>
+                    </div>
+                    <h3>Clients</h3>
+                    <Table className="mt-4">
+                        <thead>
+                        <tr>
+                            <th width="30%">Name</th>
+                            <th width="30%">Email</th>
+                            <th width="40%">Actions</th>
+                        </tr>
+                        </thead>
+                        <tbody>
+                        {clientList}
+                        </tbody>
+                    </Table>
+                </Container>
+            </div>
+        );
+    }
+}
+
+export default ClientList;

spring-boot-modules/spring-boot-react/frontend/src/Home.js

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+import React, { Component } from 'react';
+import './App.css';
+import AppNavbar from './AppNavbar';
+import { Link } from 'react-router-dom';
+import { Button, Container } from 'reactstrap';
+
+class Home extends Component {
+    render() {
+        return (
+            <div>
+                <AppNavbar/>
+                <Container fluid>
+                    <Button color="link"><Link to="/clients">Clients</Link></Button>
+                </Container>
+            </div>
+        );
+    }
+}
+
+export default Home;

spring-boot-modules/spring-boot-react/frontend/src/index.css

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+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;
+}

spring-boot-modules/spring-boot-react/frontend/src/index.js

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+import React from 'react';
+import ReactDOM from 'react-dom';
+import './index.css';
+import App from './App';
+import reportWebVitals from './reportWebVitals';
+import 'bootstrap/dist/css/bootstrap.min.css';
+
+ReactDOM.render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+  document.getElementById('root')
+);
+
+// If you want to start measuring performance in your app, pass a function
+// to log results (for example: reportWebVitals(console.log))
+// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
+reportWebVitals();

spring-boot-modules/spring-boot-react/frontend/src/reportWebVitals.js

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+const reportWebVitals = onPerfEntry => {
+  if (onPerfEntry && onPerfEntry instanceof Function) {
+    import('web-vitals').then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => {
+      getCLS(onPerfEntry);
+      getFID(onPerfEntry);
+      getFCP(onPerfEntry);
+      getLCP(onPerfEntry);
+      getTTFB(onPerfEntry);
+    });
+  }
+};
+
+export default reportWebVitals;

spring-boot-modules/spring-boot-react/frontend/src/setupTests.js

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+// jest-dom adds custom jest matchers for asserting on DOM nodes.
+// allows you to do things like:
+// expect(element).toHaveTextContent(/react/i)
+// learn more: https://github.com/testing-library/jest-dom
+import '@testing-library/jest-dom';