对于React，您可以使用React Preset安装Babel CLI，并在--watch模式下运行Babel。它会不断将JSX转换为JavaScript，如果您安装了Spring DevTools，则在IDE中运行时，在重新加载网页后会立即看到新信息。
我已经在No-Fuss React and JSX with Spring Boot上写了一个完整的教程，但这里是它的要点：

npm install --save-dev @babel/core @babel/cli @babel/preset-react
npx babel src/main/resources/static --out-dir target/classes/static --presets=@babel/preset-react --only="**/*.jsx" --watch

我的文章深入讨论了如何将其透明地集成到Maven构建中，以及如何构建HTML，以便您不需要Webpack或Maven以外的任何更大的前端构建系统。

我知道有两种不同的方法可以做到这一点。
1)使用Intellij文件监视器插件
2)运行webpack dev server作为spring-boot应用程序的反向代理
（1）

• 从存储库安装插件“文件监视器”
• 转到设置-工具-文件监视器
• 定义Webpack任务
• 文件类型：任何
• 定义一个新的范围以仅监视您的javascript文件
• 程序：从/node_modules/webpack/bin/webpack. js运行webpack，或者创建一些其他可执行文件（如$ProjectFileDir$/webpack.sh）
• 如果你选择从node_modules运行webpack（顺便说一句，由于相对路径问题，我不工作），请插入参数（如--config）
• 设置要刷新的输出路径：$ProjectFileDir$/src/main/static/js/bundled
• 将工作目录设置为：$项目文件目录$

现在，如果您在定义的范围内保存文件，webpack任务将运行。之后，您必须在浏览器中刷新页面。从https://intellij-support.jetbrains.com获得的想法
2)这种方式更高级，但更难正确配置。你将有自动重新加载（页面刷新）和完全热重新加载（React状态持续）
基本的想法是运行一个webpack-dev-server，并将该服务器用作spring-boot后端的反向代理。dev-server将自己处理对热重载内容的请求，并将其他所有内容传递给后端。从https://www.codingbismuth.com/获得的想法。
作为示例配置

{
  "name": "",
  "version": "0.0.1",
  "description": "",
  "repository": {
    "type": "git",
    "url": ""
  },
  "keywords": [
    "xy"
  ],
  "author": "murphy",
  "license": "",
  "bugs": {
    "url": ""
  },
  "scripts": {
    "start:dev": "webpack-dev-server --config webpack.dev_server.js"
  },
  "homepage": "",
  "dependencies": {
    "file-saver": "^1.3.3",
    "prop-types": "^15.5.10",
    "react": "^16.2.0",
    "react-bootstrap-typeahead": "^2.3.0",
    "react-dom": "^16.2.0",
    "react-modal": "^3.1.8",
    "react-router": "^4.2.0",
    "react-router-dom": "^4.2.2",
    "react-datetime": "^2.11.1",
    "rest": "^1.3.1",
    "moment": "^2.20.1",
    "webpack": "^3.10.0",
    "swagger-ui": "^3.13.4",
    "webpack-dev-server": "^2.11.2"
  },
  "devDependencies": {
    "webpack-cli": "^2.0.15",
    "react-hot-loader": "^4.1.2",
    "babel-core": "^6.18.2",
    "babel-eslint": "^8.0.3",
    "babel-loader": "^7.1.2",
    "babel-polyfill": "^6.26.0",
    "babel-preset-es2015": "^6.18.0",
    "babel-preset-react": "^6.16.0",
    "eslint": "^4.13.1",
    "eslint-plugin-react": "^7.5.1",
    "eslint-loader": "^1.9.0",
    "eslint-watch": "^3.1.3",
    "eslint-config-airbnb": "^16.1.0",
    "eslint-plugin-jsx-a11y": "^6.0.2",
    "eslint-plugin-import": "^2.8.0",
    "eslint-plugin-flowtype": "^2.40.1",
    "uglifyjs-webpack-plugin2": "^1.0.3"
  }
}

const { resolve } = require('path');
const path = require('path');
const webpack = require('webpack');

module.exports = {
    context: resolve(__dirname, '.'),

    entry: [
        'react-hot-loader/patch',
        // activate HMR for React

        'webpack-dev-server/client?http://localhost:8888',
        // bundle the client for webpack-dev-server
        // and connect to the provided endpoint

        'webpack/hot/only-dev-server',
        // bundle the client for hot reloading
        // only- means to only hot reload for successful updates

        // the entry point of our app
        './src/main/js/router/mainrouter.jsx',
    ],
    output: {
        filename: './mainbundle.js',
        // the output bundle

        path: resolve(__dirname, '/src/main/resources/static/js/bundled'),

        publicPath: '/js/bundled/',
        // necessary for HMR to know where to load the hot update chunks
    },

    devtool: 'sourcemaps',
    devServer: {
        hot: true,
        contentBase: [resolve(__dirname, "."), resolve(__dirname, "./src/main/resources/static/js/bundled")],
        proxy: {
            "/": {
                target: {
                    host: "localhost",
                    protocol: 'http:',
                    port: 8087,
                },
            },
            ignorePath: true,
            changeOrigin: true,
            secure: false,
        },
        publicPath: '/js/bundled/',
        port: 8888,
        host: "localhost",
    },
    module: {
        rules: [
            {
                enforce: "pre",
                test: /\.jsx$/,
                exclude: /node_modules/,
                loader: "eslint-loader",
                options: {
                    // fix: true, // autofix
                    cache: true,
                    failOnError: false,
                    emitWarning: true,
                    quiet: true,
                },
            },
            {
                test: path.join(__dirname, '.'),
                exclude: /node_modules/,
                loader: "babel-loader",
                query: {
                    // cacheDirectory: true,
                    presets: ['es2015', 'react'],
                },
            },
            {
                test: /\.css$/,
                use: ['style-loader', 'css-loader?modules'],
            },
        ],
    },

    plugins: [
        new webpack.HotModuleReplacementPlugin(),
        // enable HMR globally

        new webpack.NamedModulesPlugin(),
        // prints more readable module names in the browser console on HMR updates
    ],
};

spring Boot 应用程序运行在：8087上，webpack dev服务器运行在：8888上。现在在index.html中包含mainbundle.js。运行spring-boot应用程序并在第二个终端运行：

npm run start:dev

访问网页：8888有热重新加载文件的变化。