☕ Java 엔터프라이즈 애플리케이션 개발 전략 튜토리얼

// 1단계: Maven 프로젝트 설정 (pom.xml)
<project xmlns="http://maven.apache.org/POM/4.0.0" 
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>enterprise-app</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>Enterprise Application</name>
    <url>http://maven.apache.org</url>

    <properties>
        <java.version>17</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

// 2단계: 기본 엔터프라이즈 애플리케이션 클래스 (Employee.java)
package com.example.enterpriseapp;

import jakarta.persistence.*;

@Entity
@Table(name = "employees")
public class Employee {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(nullable = false)
    private String name;

    @Column(nullable = false, unique = true)
    private String email;

    // Getters and Setters
    public Long getId() { return id; }
    public void setId(Long id) { this.id = id; }

    public String getName() { return name; }
    public void setName(String name) { this.name = name; }

    public String getEmail() { return email; }
    public void setEmail(String email) { this.email = email; }
}

// 3단계: 서비스 계층 (EmployeeService.java)
package com.example.enterpriseapp;

import org.springframework.stereotype.Service;
import java.util.List;
import java.util.Optional;

@Service
public class EmployeeService {
    private final EmployeeRepository employeeRepository;

    public EmployeeService(EmployeeRepository employeeRepository) {
        this.employeeRepository = employeeRepository;
    }

    public List<Employee> getAllEmployees() {
        return employeeRepository.findAll();
    }

    public Optional<Employee> getEmployeeById(Long id) {
        return employeeRepository.findById(id);
    }

    public Employee saveEmployee(Employee employee) {
        return employeeRepository.save(employee);
    }

    public void deleteEmployee(Long id) {
        employeeRepository.deleteById(id);
    }
}

// 4단계: REST 컨트롤러 (EmployeeController.java)
package com.example.enterpriseapp;

import org.springframework.web.bind.annotation.*;
import java.util.List;
import java.util.Optional;

@RestController
@RequestMapping("/api/employees")
public class EmployeeController {
    private final EmployeeService employeeService;

    public EmployeeController(EmployeeService employeeService) {
        this.employeeService = employeeService;
    }

    @GetMapping
    public List<Employee> getAllEmployees() {
        return employeeService.getAllEmployees();
    }

    @GetMapping("/{id}")
    public Optional<Employee> getEmployeeById(@PathVariable Long id) {
        return employeeService.getEmployeeById(id);
    }

    @PostMapping
    public Employee createEmployee(@RequestBody Employee employee) {
        return employeeService.saveEmployee(employee);
    }

    @DeleteMapping("/{id}")
    public void deleteEmployee(@PathVariable Long id) {
        employeeService.deleteEmployee(id);
    }
}