{"id":17075,"date":"2017-05-09T12:15:02","date_gmt":"2017-05-09T09:15:02","guid":{"rendered":"https:\/\/www.webcodegeeks.com\/?p=17075"},"modified":"2017-05-08T11:09:46","modified_gmt":"2017-05-08T08:09:46","slug":"rendering-restful-service-react","status":"publish","type":"post","link":"https:\/\/www.webcodegeeks.com\/javascript\/rendering-restful-service-react\/","title":{"rendered":"Rendering RESTful service with React"},"content":{"rendered":"

Looking at the popularity of React<\/a>, I thought of learning it and creating a simple UI which will render data from RESTful<\/strong> service.<\/p>\n

With this post, I will try to replicate the steps I followed while writing it along with references. Before starting, let me give you a brief introduction about React.<\/p>\n

What is React?<\/h2>\n

React is a declarative, efficient, and flexible JavaScript library for building user interfaces. It uses virtual DOM which improve apps performance since JavaScript virtual DOM is faster than the regular DOM with a limitation that it only covers view layer of the app so you still need to choose other technologies to get a complete tooling set for development.<\/p>\n

Now, lets\u2019 start with creating react-app<\/strong> running on port 8080<\/strong>, following below steps:<\/p>\n

Step 1:<\/strong> Go to start.spring.io<\/a> and create a new project react-app<\/strong> adding the Thymeleaf starters, based on the following image:<\/p>\n

\"\"<\/a>
\nStep 2:<\/strong> Edit ReactAppApplication.java<\/strong> to add a method which returns a list of employee, as follows:<\/p>\n

package com.arpit.react.app;\r\n\r\nimport java.util.ArrayList;\r\nimport java.util.List;\r\nimport org.springframework.boot.SpringApplication;\r\nimport org.springframework.boot.autoconfigure.SpringBootApplication;\r\nimport org.springframework.stereotype.Controller;\r\nimport org.springframework.web.bind.annotation.GetMapping;\r\nimport org.springframework.web.bind.annotation.RestController;\r\n\r\n@SpringBootApplication\r\n@RestController\r\npublic class ReactAppApplication {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tSpringApplication.run(ReactAppApplication.class, args);\r\n\t}\r\n\r\n\t@GetMapping(\"\/employee\/get\")\r\n\tpublic List<Employee> get() {\r\n\t\tList<Employee> employeeList = new ArrayList<>();\r\n\t\temployeeList.add(new Employee(1, \"Arpit\", \"IT\"));\r\n\t\temployeeList.add(new Employee(2, \"Sanjeev\", \"IT\"));\r\n\t\treturn employeeList;\r\n\t}\r\n}\r\n\r\n@Controller\r\nclass IndexPageController {\r\n\r\n\t@GetMapping(value = \"\/\")\r\n\tpublic String index() {\r\n\t\treturn \"index\";\r\n\t}\r\n}\r\n\r\nfinal class Employee {\r\n\r\n\tprivate int id;\r\n\tprivate String name;\r\n\tprivate String department;\r\n\r\n\tpublic Employee() {\r\n\r\n\t}\r\n\r\n\tpublic Employee(final int id, final String name, final String department) {\r\n\t\tthis.id = id;\r\n\t\tthis.name = name;\r\n\t\tthis.department = department;\r\n\t}\r\n\r\n\tpublic int getId() {\r\n\t\treturn id;\r\n\t}\r\n\r\n\tpublic void setId(int id) {\r\n\t\tthis.id = id;\r\n\t}\r\n\r\n\tpublic String getName() {\r\n\t\treturn name;\r\n\t}\r\n\r\n\tpublic void setName(String name) {\r\n\t\tthis.name = name;\r\n\t}\r\n\r\n\tpublic String getDepartment() {\r\n\t\treturn department;\r\n\t}\r\n\r\n\tpublic void setDepartment(String department) {\r\n\t\tthis.department = department;\r\n\t}\r\n}<\/pre>\n
IndexPageController<\/strong> define index() method flagged by @GetMapping(value = \u201c\/\u201d)<\/strong> to support the \/<\/strong><\/code> route. It returns index as the name of the template, which Spring Boot\u2019s autoconfigured view resolver will map to src\/main\/resources\/templates\/index.html<\/strong>.<\/p>\n
Step 3:<\/strong> Define an HTML template src\/main\/resources\/templates\/index.html<\/strong> with the following\u00a0content:<\/p>\n
<!DOCTYPE html>\r\n<html xmlns:th=\"http:\/\/www.thymeleaf.org\">\r\n<head lang=\"en\">\r\n<meta charset=\"UTF-8\" \/>\r\n<title>React with Spring REST<\/title>\r\n<\/head>\r\n<body>\r\n\t<div id=\"react\"><\/div>\r\n\t<script src=\"package\/script.js\"><\/script>\r\n<\/body>\r\n<\/html><\/pre>\n
Step 5:<\/strong> Next we will add frontend-maven-plugin<\/strong><\/a> in pom.xml<\/strong> \u00a0to install Node and NPM locally for the react-app followed by running Webpack<\/a> \u00a0build, as follows:<\/p>\n
<plugin>\r\n\t\t\t\t<groupId>com.github.eirslett<\/groupId>\r\n\t\t\t\t<artifactId>frontend-maven-plugin<\/artifactId>\r\n\t\t\t\t<version>1.2<\/version>\r\n\t\t\t\t<configuration>\r\n\t\t\t\t\t<installDirectory>target<\/installDirectory>\r\n\t\t\t\t<\/configuration>\r\n\t\t\t\t<executions>\r\n\t\t\t\t\t<execution>\r\n\t\t\t\t\t\t<id>install node and npm<\/id>\r\n\t\t\t\t\t\t<goals>\r\n\t\t\t\t\t\t\t<goal>install-node-and-npm<\/goal>\r\n\t\t\t\t\t\t<\/goals>\r\n\t\t\t\t\t\t<configuration>\r\n\t\t\t\t\t\t\t<nodeVersion>v4.4.5<\/nodeVersion>\r\n\t\t\t\t\t\t\t<npmVersion>3.9.2<\/npmVersion>\r\n\t\t\t\t\t\t<\/configuration>\r\n\t\t\t\t\t<\/execution>\r\n\t\t\t\t\t<execution>\r\n\t\t\t\t\t\t<id>npm install<\/id>\r\n\t\t\t\t\t\t<goals>\r\n\t\t\t\t\t\t\t<goal>npm<\/goal>\r\n\t\t\t\t\t\t<\/goals>\r\n\t\t\t\t\t\t<configuration>\r\n\t\t\t\t\t\t\t<arguments>install<\/arguments>\r\n\t\t\t\t\t\t<\/configuration>\r\n\t\t\t\t\t<\/execution>\r\n\t\t\t\t\t<execution>\r\n\t\t\t\t\t\t<id>webpack build<\/id>\r\n\t\t\t\t\t\t<goals>\r\n\t\t\t\t\t\t\t<goal>webpack<\/goal>\r\n\t\t\t\t\t\t<\/goals>\r\n\t\t\t\t\t<\/execution>\r\n\t\t\t\t<\/executions>\r\n<\/plugin><\/pre>\n
Step 6:<\/strong> Execute npm init<\/strong><\/code> in the root directory to create package.json<\/strong> in which we specify all the dependencies<\/a> required to build our react-app like React<\/strong>, React DOM<\/strong>, Webpack<\/strong>, Babel Loader<\/strong>, Babel Core<\/strong>, Babel Preset: ES2015<\/strong>, Babel Preset: React<\/strong>, as follows:<\/p>\n
$ cd react-app\r\n$ touch npm init<\/pre>\n
Copy the following content:<\/p>\n
{\r\n  \"name\": \"react-app\",\r\n  \"version\": \"1.0.0\",\r\n  \"description\": \"Rendering RESTful service with React\",\r\n  \"repository\": {\r\n    \"type\": \"git\",\r\n    \"url\": \"git@github.com:arpitaggarwal\/react-app.git\"\r\n  },\r\n  \"keywords\": [\r\n    \"rest\",\r\n    \"spring\",\r\n    \"react\"\r\n  ],\r\n  \"author\": \"Arpit Aggarwal\",\r\n  \"dependencies\": {\r\n    \"axios\": \"^0.16.1\",\r\n    \"react\": \"^15.3.2\",\r\n    \"react-dom\": \"^15.3.2\",\r\n    \"webpack\": \"^1.12.2\"\r\n  },\r\n  \"scripts\": {\r\n    \"watch\": \"webpack --watch -d\"\r\n  },\r\n  \"devDependencies\": {\r\n    \"babel-core\": \"^6.18.2\",\r\n    \"babel-loader\": \"^6.2.7\",\r\n    \"babel-polyfill\": \"^6.16.0\",\r\n    \"babel-preset-es2015\": \"^6.18.0\",\r\n    \"babel-preset-react\": \"^6.16.0\"\r\n  }\r\n}<\/pre>\n
Step 7:<\/strong> Next we will create webpack.config.js<\/strong> to configure webpack, as follows:<\/p>\n
$ cd react-app\r\n$ touch webpack.config.js<\/pre>\n
Copy the following\u00a0content:<\/p>\n
var path = require('path');\r\n\r\nmodule.exports = {\r\n    entry: '.\/app\/main.js',\r\n    cache: true,\r\n    debug: true,\r\n    output: {\r\n        path: __dirname,\r\n        filename: '.\/src\/main\/resources\/static\/package\/script.js'\r\n    },\r\n    module: {\r\n        loaders: [\r\n            {\r\n                test: path.join(__dirname, '.'),\r\n                exclude: \/(node_modules)\/,\r\n                loader: 'babel',\r\n                query: {\r\n                    cacheDirectory: true,\r\n                    presets: ['es2015', 'react']\r\n                }\r\n            }\r\n        ]\r\n    }\r\n};<\/pre>\n
entry<\/strong> option specified above is the entry point for the bundle.
\ncache<\/strong> option specified above Cache generated modules and chunks to improve performance for multiple incremental builds.
\noutput<\/strong> option specified above tell Webpack how to write the compiled files to disk.<\/p>\n
For more configuration options you can explore here<\/a>.<\/p>\n
Step 8:<\/strong> Next we will create entry point for the webpack which is react-app\/app\/main.js<\/code>, as:<\/p>\n
$ cd react-app\r\n$ mkdir app\r\n$ cd app\r\n$ touch main.js<\/pre>\n
Copy the following content:<\/p>\n
'use strict';\r\nconst React = require('react');\r\nconst ReactDOM = require('react-dom')\r\n\r\nimport ReactApp from '.\/components\/react-app.jsx'\r\n\r\nReactDOM.render(\r\n\t\t<ReactApp \/>,\r\n\tdocument.getElementById('react')\r\n)<\/pre>\n
React<\/strong> is the main library from Facebook for building the app.
\nReactDOM<\/strong> provides DOM-specific methods that can be used at the top level.
\nReactApp<\/strong> is the top level container for all React components.<\/p>\n
Let\u2019s define ReactApp<\/strong> along with it\u2019s child components, as:<\/p>\n
$ cd react-app\/app\/\r\n$ mkdir components\r\n$ cd components\r\n$ touch react-app.jsx employee-list.jsx employee.jsx<\/pre>\n
react-spring\/app\/components\/react-app.jsx<\/strong><\/p>\n
'use strict';\r\nconst React = require('react');\r\nvar axios = require('axios');\r\n\r\nimport EmployeeList from '.\/employee-list.jsx'\r\n\r\nexport default class ReactApp extends React.Component {\r\n\r\n\tconstructor(props) {\r\n\t\tsuper(props);\r\n\t\tthis.state = {employees: []};\r\n\t\tthis.Axios = axios.create({\r\n\t\t    baseURL: \"\/employee\",\r\n\t\t    headers: {'content-type': 'application\/json', 'creds':'user'}\r\n\t\t});\r\n\t}\r\n\r\n\tcomponentDidMount() {\r\n\t\tlet _this = this;\r\n\t\tthis.Axios.get('\/get')\r\n\t\t  .then(function (response) {\r\n\t\t     console.log(response);\r\n\t\t    _this.setState({employees: response.data});\r\n\t\t  })\r\n\t\t  .catch(function (error) {\r\n\t\t    console.log(error);\r\n\t\t  });\r\n\t}\r\n\r\n\trender() {\r\n\t\treturn (\r\n\t\t\t\t<div>\r\n\t\t\t\t  <EmployeeList employees={this.state.employees}\/>\r\n\t\t        <\/div>\r\n\t\t\t)\r\n\t}\r\n}<\/pre>\n
react-spring\/app\/components\/employee-list.jsx<\/strong><\/p>\n
const React = require('react');\r\nimport Employee from '.\/employee.jsx'\r\n\r\nexport default class EmployeeList extends React.Component{\r\n    \r\n    render() {\r\n\t\tvar employees = this.props.employees.map((employee, i) =>\r\n\t\t\t<Employee key={i} employee={employee}\/>\r\n\t\t);\r\n\t\t\r\n\t\treturn (\r\n\t\t\t<table>\r\n\t\t\t\t<tbody>\r\n\t\t\t\t\t<tr>\r\n\t\t\t\t\t\t<th>ID<\/th>\r\n\t\t\t\t\t\t<th>Name<\/th>\r\n\t\t\t\t\t\t<th>Department<\/th>\r\n\t\t\t\t\t<\/tr>\r\n\t\t\t\t\t{employees}\r\n\t\t\t\t<\/tbody>\r\n\t\t\t<\/table>\r\n\t\t)\r\n\t}\r\n}<\/pre>\n
react-spring\/app\/components\/employee.jsx<\/strong><\/p>\n
const React = require('react');\r\n\r\nexport default class Employee extends React.Component{\r\n\trender() {\r\n\t\treturn (\r\n\t\t\t<tr>\r\n\t\t\t\t<td>{this.props.employee.id}<\/td>\r\n\t\t\t\t<td>{this.props.employee.name}<\/td>\r\n\t\t\t\t<td>{this.props.employee.department}<\/td>\r\n\t\t\t<\/tr>\r\n\t\t)\r\n\t}\r\n}<\/pre>\n
With all this in place, your directory structure should look like:<\/p>\n
\"\"<\/a><\/p>\n
Now re-run the application and visit http:\/\/localhost:8080<\/a><\/strong>.<\/p>\n
Complete source code is hosted on github<\/a>.<\/p>\n
\n\n\n\n
Reference: <\/span><\/td>\nRendering RESTful service with React<\/a> from our WCG partner<\/a> Arpit Aggarwal at the Arpit Aggarwal<\/a> blog.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
Looking at the popularity of React, I thought of learning it and creating a simple UI which will render data from RESTful service. With this post, I will try to replicate the steps I followed while writing it along with references. Before starting, let me give you a brief introduction about React. What is React? …<\/p>\n","protected":false},"author":492,"featured_media":920,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[463],"class_list":["post-17075","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript","tag-react-js"],"yoast_head":"\nRendering RESTful service with React - Web Code Geeks - 2026<\/title>\n<meta name=\"description\" content=\"Looking at the popularity of React, I thought of learning it and creating a simple UI which will render data from RESTful service. 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Step 4:<\/strong> Move to react-app<\/strong> directory and run command: mvn spring-boot:run<\/strong><\/code>. Once running open http:\/\/localhost:8080\/employee\/get<\/a><\/strong> which will give you the list of employees we are going to render on UI built with React.<\/p>\n