The combination of Java framework and front-end Angular framework

Answer: Java back-end framework and Angular front-end framework can be integrated to provide a powerful combination for building modern web applications. Steps: Create Java backend project, select Spring Web and Spring Data JPA dependencies. Define model and repository interfaces. Create a REST controller and provide endpoints. Create an Angular project. Add Spring Boot Java dependency. Configure CORS. Integrate Angular in Angular components.

Integration of Java back-end framework and Angular front-end framework

Java back-end framework and Angular front-end framework are important for building modern web applications A powerful combination of programs. This article will introduce how to integrate the Java framework and the Angular framework, including practical cases of Spring Boot and Angular.

Steps:

1. Create a Java backend project

Use Spring Initializr to create a Spring Boot project, select the following Dependencies:

• Spring Web
• Spring Data JPA

## 2. Define the model and repository

Create a Product entity in the model package and define a ProductRepository repository interface.

3. Create a REST controller

Create a ProductController in the controller package and provide a REST endpoint to interact with the Product entity.

4. Create an Angular project

Run the following command in the project folder to create an Angular project:

ng new [project-name]

5. Add Spring Boot Java dependency

In the package.json file of the Angular project, add the Spring Boot Java dependency:

"dependencies": {
  ...
  "spring-boot": "^2.6.6",
  ...
}

6. Configure CORS

In the Spring Boot application, configure Cross-Origin Resource Sharing (CORS) in the Web Security Configuration:

@Configuration
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.cors().and()
            ...
    }

}

7. Integrate Angular

In the Angular component, Use the endpoints provided by the Spring Boot Java service. The following example shows how to get the product list from ProductController:

import { HttpClient } from '@angular/common/http';

@Component({
  selector: 'app-product-list',
  templateUrl: './product-list.component.html',
  styleUrls: ['./product-list.component.css']
})
export class ProductListComponent {
  products: Product[];

  constructor(private http: HttpClient) {}

  ngOnInit(): void {
    this.http.get<Product[]>('/api/products').subscribe(products => {
      this.products = products;
    });
  }
}

Practical case: Spring Boot and Angular

This practical case creates a simple product management application.

• Backend: Spring Boot is used to create a RESTful API to manage products.
• Front-end: Angular is used to create the user interface that allows users to view and create products.

Run the application:

In the Java project, run
1. mvn spring-boot:run.
In the Angular project, run
2. ng serve.

The application will run on the configured port (8080 by default). You can view the product list by visiting the following URL: http://localhost:4200/products.

The above is the detailed content of The combination of Java framework and front-end Angular framework. For more information, please follow other related articles on the PHP Chinese website!