利用 Java 框架在云中构建可扩展的微服务

// Customer.java
@Entity
public class Customer {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Long id;
    private String firstName;
    private String lastName;
}

// CustomerRepository.java
public interface CustomerRepository extends JpaRepository<Customer, Long> {}

// CustomerService.java
@Service
public class CustomerService {
    private CustomerRepository customerRepository;

    public CustomerService(CustomerRepository customerRepository) {
        this.customerRepository = customerRepository;
    }

    public List<Customer> getAllCustomers() {
        return customerRepository.findAll();
    }

    public Customer createCustomer(Customer customer) {
        return customerRepository.save(customer);
    }
}

// CustomerController.java
@RestController
@RequestMapping("/api/customers")
public class CustomerController {
    private CustomerService customerService;

    public CustomerController(CustomerService customerService) {
        this.customerService = customerService;
    }

    @GetMapping
    public List<Customer> getAllCustomers() {
        return customerService.getAllCustomers();
    }

    @PostMapping
    public Customer createCustomer(@RequestBody Customer customer) {
        return customerService.createCustomer(customer);
    }
}

// application.properties
# Spring Data JPA properties
spring.jpa.hibernate.ddl-auto=update
spring.jpa.database-platform=org.hibernate.dialect.MySQL5Dialect
spring.datasource.url=jdbc:<a style='color:#f60; text-decoration:underline;' href="https://www.php.cn/zt/15713.html" target="_blank">mysql</a>://localhost:3306/example
spring.datasource.username=root
spring.datasource.password=password

// MainApplication.java
@SpringBootApplication
public class MainApplication {
    public static void main(String[] args) {
        SpringApplication.run(MainApplication.class, args);
    }
}