[development] 10 minutes fast spring boot + react front and rear separation

mind_ programmonkey 2020-11-13 04:19:25
development minutes fast spring boot


【 Development of article 】10 Minutes to get started spring boot+react Back end separation tutorial

I'm back again , This time quickly build a spring boot+react Front and rear end hello world Of demo!!!

1. Fore and aft end separation

Fore and aft end separation ( decoupling ) The core idea of : front end HTML Page passing Ajax Call back-end RestFul API And use JSON Data to interact .

1.1 Conventional MVC Design process

Conventional MVC Design mode of :

namely Model-View-Controller The model - View - controller

MVC Design process :

Models and views are glued through controllers , for example , The user sends a HTTP request , At this point, the request first enters the controller , Then the controller takes the data and encapsulates it as a model , Finally, the model is passed to the view to show .

1.2 Front and back separation design flow

The design process of separation of front and rear end :

Be careful :

1. The way before :

  • Client request
  • Server side servlet or controller Accept the request ( The back end controls the routing and rendering of the page )
  • call service,dao The code completes the business logic
  • return jsp
  • jsp Show some dynamic code

2. The way of separation :

  • The browser sends a request
  • Directly to html page ( The front end controls the routing and rendering of the page , The weight of the whole page development moves forward )
  • html The page is responsible for calling the data generated by the browser interface ( adopt ajax Backstage return json Format data )
  • fill html, Display dynamic effects , Parse and operate on the page DOM.

1.3 The cross domain problems encountered in the separation of the front end and the back end

(1). Cross domain issues :

react And spring boot Fore and aft end separation ,react Port is 300 and spring boot Port is 8080, Cross port access to common ajax It's not accessible across domains .

(2). What is cross-domain ?

When the client makes a network request to the viewer ,url There will be three main messages : agreement (protocal), domain name (host), Port number (port). When all three parts are the same as the server , Belong to the homologous . But as long as there is one difference , It's a cross domain call , Will be limited by the same source strategy .

(3). The same-origin policy

The same origin policy limits how a document or script loaded from one source interacts with resources from another source . This is a key security mechanism for isolating potentially malicious files .

(4). Solutions

stay spring boot Add spring mvc Implemented at the bottom web Configure adapter , increase cors Related configuration information ;

// An highlighted block
@Configuration
public class CorsConfig implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println(" The filter creates ");
}
@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
HttpServletResponse response = (HttpServletResponse) res;
HttpServletRequest request = (HttpServletRequest) req;
String path = request.getServletPath();
// front end react The domain name of the project
response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));
response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, PUT");
response.setHeader("Access-Control-Max-Age", "3600");
// Set allow access cookie
response.setHeader("Access-Control-Allow-Credentials", "true");
response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
if (request.getMethod().equals("OPTIONS")) {
response.setStatus(HttpServletResponse.SC_OK);
}else{
chain.doFilter(request, res);
}
}
@Override
public void destroy() {
System.out.println(" The filter is destroyed ");
}
}

2. Build a spring boot project

Build a controller

Enter... In the navigator http://localhost:8080/hello

3. establish react project

(1) Build a react project

 npx create-react-app react_login

(2) Organize the code structure

stay src Next new assets as well as componets Folder .

among assets To divide into css,js,images Folder .

(3) Configure the server port address

namely config/config.js


global.AppConfig = {
//serverIP Back end server address
serverIP:'http://172.xx.xx.xx:8080'
}

(4) front end axios Send a request

Remember to download axios

npm install axios --save
import React from 'react';
import '../config/config.js';
import axios from 'axios';
class Welcome extends React.Component {
constructor(props) {
​ super(props);
​ this.state = {
​ welcome_list:''
​ };
}
componentDidMount(){
​ let api = global.AppConfig. serverIP + "/hello";
​ const axios = require('axios');
​ axios.get(api)
​ .then((response)=> {
​ // handle success
​ console.log(response.data);
​ let tempData = response.data
​ this.setState({
​ welcome_list:tempData
​ })
​ })
​ .catch(function (error) {
​ // handle error
​ console.log(error);
​ })
}
render() {
​ return (
<div> Welcome to {this.state.welcome_list}</div>
​ );
}
}
export default Welcome;

(5)react Introduction in welcome Components

Be accomplished , Fangtu town building !!!

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