This article explains in detail how the data of the front-end and back-end are connected (based on Spring Boot, Django or)

Preface

The data connection between the front-end and the back-end mainly interacts through the **API (Application Programming Interface), which is the bridge for front-end communication. The front-end issues a request, the back-end receives the request and processes the data, and then returns the result to the front-end. The following is the specific process:

1. The process of front-end communication

front end:

• User operations: The user interacts with the front-end interface in the browser, such as clicking buttons, submitting forms, etc.
• Send requests: The front-end uses methods such as AJAX, Fetch API, or Axios to send requests to the back-end through HTTP protocol (usually GET, POST, PUT, DELETE and other request types). The request can contain parameters, request body and other data.
• parsing data: The front-end receives the data returned by the back-end (usually in JSON format), and then parses and renders the data on the page through JavaScript.

rear end:

• Receive request:The backend (for example, an application based on Spring Boot, Django, or an application) receives an HTTP request sent by the frontend.
• Processing requests: The backend performs queries, inserts, updates or deletes in the database based on the request type and passed parameters.
• Return response: After the backend processes data, the result is returned to the frontend via HTTP response, usually in JSON or XML format.

2. Technical details of front-end and back-end interaction

• AJAX/Fetch API: The front-end sends asynchronous requests to the back-end through AJAX or Fetch API, which can achieve partial updates of the page without refreshing the entire page.

// Example: Send requests using Fetch APIfetch('/data', {
  method: 'GET'
})
.then(response => ())
.then(data => {
  (data); // Process the returned data})
.catch(error => ('Error:', error));

• REST API: The backend usually provides a REST API interface, and performs different operations through different HTTP verbs (such as GET, POST, PUT, DELETE).

// Spring Boot backend example: Handling GET requests@GetMapping("/api/data")
public List<Data> getData() {
    return ();
}

• Database interaction: After the backend receives the request, it obtains or operates data from the database through ORM frameworks (such as Hibernate) or SQL queries.

// Get data from the database through JPA@Entity
public class Data {
    @Id
    private Long id;
    private String name;
}

@Repository
public interface DataRepository extends JpaRepository<Data, Long> {}

3. Data formats for the front and back ends

JSON: The most commonly used data exchange format, the front-end and back-end pass data through the JSON format, with clear structure and easy to parse.

{
  "id": 1,
  "name": "Amy",
  "email": "amy@"
}

XML: Sometimes XML is also used for data transmission, but it is more complicated than JSON.

4. Security and verification

Connections to the front and back ends usually require authentication (such as OAuth, JWT) to ensure security. The front-end may carry authentication tokens when requesting, and the back-end will verify these tokens when receiving the request, ensuring that only authorized users can access the data.

Through this front-end and back-end data interaction method, users can view and modify the data stored in the back-end in real time on the front-end interface, ensuring the dynamic and interactive nature of the application.

Summarize

This is the article about how the front-end and back-end data is connected. For more related front-end and back-end data, please search for my previous articles or continue browsing the related articles below. I hope everyone will support me in the future!