How to build efficient backend applications using React and JVM languages

How to use React and JVM language to build efficient back-end applications

Overview:
In modern web application development, React has become the first choice for front-end development One of the frameworks, and JVM languages ​​such as Java, Kotlin, etc. are widely used in back-end development. This article will introduce how to use React and JVM language to build efficient back-end applications, and provide specific code examples.

1. Build the project environment
First, we need to build the React and JVM language development environment. For the React development environment, you can use tools such as Create React App to quickly build a basic React project. For the JVM language development environment, we need to install the corresponding development tools and environments. If you use Java development, you can choose to use an integrated development environment such as IDEA.

2. Combination of React and JVM language

1. Create RESTful API
   In JVM language, we can use the Spring Boot framework to quickly create RESTful API. By creating the Controller class and corresponding routing, we can implement the interface of business logic and provide relevant data interaction interfaces.
2. Front-end and back-end data interaction
   React can send HTTP requests through libraries such as fetch and axios, and interact with back-end APIs for data. We can use these libraries in React components to send requests and process the returned data to achieve data interaction between the front and back ends.
3. Construction of React components
   Using React's component development idea, we can subdivide the page into multiple components, each component is responsible for the corresponding functions and logic. In this way, we can better organize and manage code and improve code reusability and maintainability.
4. Back-end data processing
   In the JVM language, we can use the corresponding database access framework (such as JPA, MyBatis, etc.) to handle database operations. By defining entity classes and corresponding Repository interfaces, we can easily perform addition, deletion, modification, and query operations in the database.
5. Back-end data transmission
   In terms of front-end and back-end data transmission, we can use JSON format to serialize and deserialize data. By returning data in JSON format in the back-end API, the front-end can easily process and display this data.

3. Code Example
The following is a simple example that shows how to use React and JVM language to build a back-end application based on Spring Boot and React.

Back-end API example (using Java and Spring Boot):

@RestController
@RequestMapping("/api")
public class UserController {
    
    @Autowired
    private UserRepository userRepository;
    
    @GetMapping("/users")
    public List<User> getUsers() {
        return userRepository.findAll();
    }
    
    @PostMapping("/users")
    public User createUser(@RequestBody User user) {
        return userRepository.save(user);
    }
}

Front-end component example (using React):

import React, { useEffect, useState } from 'react';
import axios from 'axios';

const UserList = () => {
  const [users, setUsers] = useState([]);

  useEffect(() => {
    axios.get('/api/users')
      .then(response => setUsers(response.data))
      .catch(error => console.error(error));
  }, []);

  return (
    <div>
      <h2 id="User-List">User List</h2>
      <ul>
        {users.map(user => <li key={user.id}>{user.name}</li>)}
      </ul>
    </div>
  );
};

export default UserList;

In this example, the back-end API interface provides Functions to get user list and create users. The front-end component uses the axios library to send a GET request to obtain the user list and display it on the page.

Conclusion:
By combining React and JVM languages, we can build efficient back-end applications. React provides the convenience of front-end development and the idea of ​​component development, while the JVM language provides powerful back-end development capabilities and tool libraries. Using the combination of React and JVM languages, we can develop efficient, scalable and easy-to-maintain back-end applications.

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