Analysis and application of Ajax technology in 13 springboot project

Jason 2020-11-10 12:44:31
analysis application ajax technology springboot

Ajax Technical introduction

Background analysis ?

Today, with the rapid development of Internet , Conventional WEB application , For high concurrency 、 High performance 、 The demand for high reliability is imminent . Single thread mode of client-side and server-side interaction mode has been unable to meet the needs of the current stage . We need to be asynchronous 、 Load on demand to get data from the server and refresh in time , To improve the user experience , therefore Ajax The birth of Technology .

Ajax What is it? ?

Ajax (Asynchronous JavaScript and XML) It's a kind of Web Application client technology , You can use client script (javascript) Asynchronous communication with server applications ( Multiple threads can interact with the server at the same time ), And after getting the server-side data on demand , Local refresh can be done , In order to improve the data response and rendering speed .

Ajax Application scenarios ?

Ajax The biggest advantage of technology is the underlying asynchronous , Then partial refresh , To improve the user experience , This technology is now well used in many projects , for example :

  • Commodity system .
  • Evaluation system .
  • Map system .
  • …..

AJAX You can just send and retrieve the necessary data to the server , And in the client side JavaScript Processing the response from the server . This reduces the amount of data exchanged between the server and the browser , The server responds faster . but Ajax Technology also has disadvantages , The biggest disadvantage is that cross domain access is not available directly .

Ajax Application model analysis ?

Ajax Quick start

Ajax Request response process analysis

The traditional way is web Request and response ( The client has to wait for the response ), As shown in the figure :


Ajax How to request and respond ( The key is that the client does not block ), As shown in the figure :


Ajax Programming steps and template code analysis

Ajax The basic steps of coding ?( The key is ajax The entrance of Technology -XMLHttpRequest-XHR object )

First step : be based on dom Event creation XHR object
The second step : stay XHR Register state listener on object ( Monitor the communication process between client and server )
The third step : Establish a connection with the server ( Specify request method , request url, Synchronous or asynchronous )
Step four : Send a request ( Pass the request data to the server )

Ajax The template code for the encoding process is as follows :

var xhr=new XMLHttpRequest();

SpringBoot project Ajax Introduction analysis of technology application

First step : Create project module, As shown in the figure :


The second step : add to Spring web rely on , The code is as follows :


The third step : establish AjaxController Handle client requests , The code is as follows :

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
public class AjaxController {
public String doAjaxGet01(){
return "Response Result Of Ajax Get Request 01 ";

Step four : In the project static Under the table of contents , Create a page ajax-01.html, The code is as follows :

html The element code is as follows :

<h1>The Ajax 01 Page</h1>
<legend>Ajax asynchronous Get request </legend>
<button onclick="doAjaxGet01()">Ajax Get Request</button>
<span id="result">Data is Loading ...</span>

javascript The script code is as follows :

function doAjaxGet01(){
//debugger// Client breakpoints ( This breakpoint takes effect by opening the console )
//1. establish XHR object (XmlHttpRequest)-Ajax The entry object of the application
let xhr=new XMLHttpRequest();
//2. stay XHR Register state listener on object ( Get the server response results and update to the page result Location )
xhr.onreadystatechange=function(){// Event handler ( The communication state between the client and the server changes This function is executed when )
//readyState==4 Indicates that the server responds that the client data has been received .
if(xhr.status==200){//status==200 Indicates that the request processing is OK
//3. Establish a connection with the server ( Specify request method , request url, asynchronous )"GET","http://localhost/doAjaxGet01",true);//true On behalf of the asynchronous
//4. Send a request to the server
xhr.send(null);//get request send Methods do not transfer data or write a null
console.log("===main thread===")
// If it is an asynchronous client, the execution is finished send Will continue down .

Step five : start-up Tomcat Service and access test analysis .


Click on Ajax Get Request Button , Detect page data updates .

Step six : During the start-up and access process Bug analysis

  • There is no response when you click the button


  • The object accessing the specified property does not exist


  • Cross domain access


Ajax Basic business implementation

Basic business description

The key code design and implementation of the server

Client key code design and implementation

Ajax Advanced technology implementation

Ajax Encapsulation of code

Ajax The implementation of small programming framework

Ajax Technology in Jquery Application in

Jquery brief introduction

Jquery Commonly used ajax Function analysis

Jquery in Ajax The basic application implementation of function

summary (Summary)

This chapter mainly introduces Ajax What is it? 、 Application scenarios 、 The communication model between client and server 、ajax The basic steps of programming 、 Packaging process and ajax Technology in some JS Applications in the framework, etc , And focus on the analysis in ajax Some debugging skills in the coding process .


  1. [front end -- JavaScript] knowledge point (IV) -- memory leakage in the project (I)
  2. This mechanism in JS
  3. Vue 3.0 source code learning 1 --- rendering process of components
  4. Learning the realization of canvas and simple drawing
  5. gin里获取http请求过来的参数
  6. vue3的新特性
  7. Get the parameters from HTTP request in gin
  8. New features of vue3
  9. vue-cli 引入腾讯地图(最新 api,rocketmq原理面试
  10. Vue 学习笔记(3,免费Java高级工程师学习资源
  11. Vue 学习笔记(2,Java编程视频教程
  12. Vue cli introduces Tencent maps (the latest API, rocketmq)
  13. Vue learning notes (3, free Java senior engineer learning resources)
  14. Vue learning notes (2, Java programming video tutorial)
  15. 【Vue】—props属性
  16. 【Vue】—创建组件
  17. [Vue] - props attribute
  18. [Vue] - create component
  19. 浅谈vue响应式原理及发布订阅模式和观察者模式
  20. On Vue responsive principle, publish subscribe mode and observer mode
  21. 浅谈vue响应式原理及发布订阅模式和观察者模式
  22. On Vue responsive principle, publish subscribe mode and observer mode
  23. Xiaobai can understand it. It only takes 4 steps to solve the problem of Vue keep alive cache component
  24. Publish, subscribe and observer of design patterns
  25. Summary of common content added in ES6 + (II)
  26. No.8 Vue element admin learning (III) vuex learning and login method analysis
  27. Write a mini webpack project construction tool
  28. Shopping cart (front-end static page preparation)
  29. Introduction to the fluent platform
  30. Webpack5 cache
  31. The difference between drop-down box select option and datalist
  32. CSS review (III)
  33. Node.js学习笔记【七】
  34. Node.js learning notes [VII]
  35. Vue Router根据后台数据加载不同的组件(思考-&gt;实现-&gt;不止于实现)
  36. Vue router loads different components according to background data (thinking - & gt; Implementation - & gt; (more than implementation)
  37. 【JQuery框架,Java编程教程视频下载
  38. [jQuery framework, Java programming tutorial video download
  39. Vue Router根据后台数据加载不同的组件(思考-&gt;实现-&gt;不止于实现)
  40. Vue router loads different components according to background data (thinking - & gt; Implementation - & gt; (more than implementation)
  41. 【Vue,阿里P8大佬亲自教你
  42. 【Vue基础知识总结 5,字节跳动算法工程师面试经验
  43. [Vue, Ali P8 teaches you personally
  44. [Vue basic knowledge summary 5. Interview experience of byte beating Algorithm Engineer
  45. 【问题记录】- 谷歌浏览器 Html生成PDF
  46. [problem record] - PDF generated by Google browser HTML
  47. 【问题记录】- 谷歌浏览器 Html生成PDF
  48. [problem record] - PDF generated by Google browser HTML
  49. 【JavaScript】查漏补缺 —数组中reduce()方法
  50. [JavaScript] leak checking and defect filling - reduce() method in array
  51. 【重识 HTML (3),350道Java面试真题分享
  52. 【重识 HTML (2),Java并发编程必会的多线程你竟然还不会
  53. 【重识 HTML (1),二本Java小菜鸟4面字节跳动被秒成渣渣
  54. [re recognize HTML (3) and share 350 real Java interview questions
  55. [re recognize HTML (2). Multithreading is a must for Java Concurrent Programming. How dare you not
  56. [re recognize HTML (1), two Java rookies' 4-sided bytes beat and become slag in seconds
  57. 【重识 HTML ,nginx面试题阿里
  58. 【重识 HTML (4),ELK原来这么简单
  59. [re recognize HTML, nginx interview questions]
  60. [re recognize HTML (4). Elk is so simple