[Spring Boot] Service 생성

0. Service

 

Service는 웹 어플리케이션에서 비즈니스 로직을 처리하는 영역이다. Controller에서 클라이언트로부터 들어온 요청에 대해 처리한 Service를 선택한다. 그리고 Service에서는 요청 데이터를 처리한 후 DAO로 보내 DB와 작업을 수행하도록 한다.

 

 

1. ProductService

 

package com.web.springtest00.product.service;

import com.web.springtest00.data.dto.ProductDto;
import com.web.springtest00.data.dto.ProductResponseDto;

public interface ProductService {

    ProductResponseDto getProduct(Long number);

    ProductResponseDto saveProduct(ProductDto productDto);
    
    ProductResponseDto changeProductName(Long number, String name) throws Exception;

    void deleteProduct(Long number) throws Exception;
}

 

 

2. ProductServiceImpl

 

package com.web.springtest00.product.service.impl;

import java.time.LocalDateTime;

import org.springframework.stereotype.Service;

import com.web.springtest00.data.dao.ProductDAO;
import com.web.springtest00.data.dto.ProductDto;
import com.web.springtest00.data.dto.ProductResponseDto;
import com.web.springtest00.data.entity.Product;
import com.web.springtest00.product.service.ProductService;

@Service
public class ProductServiceImpl implements ProductService {

    private final ProductDAO productDAO;

    public ProductServiceImpl (ProductDAO productDAO){
        this.productDAO = productDAO;
    }

    @Override
    public ProductResponseDto getProduct(Long number) {
        Product product = productDAO.selectProduct(number);
        if(product == null) return null;

        ProductResponseDto productResponseDto = new ProductResponseDto();
        productResponseDto.setNumber(product.getNumber());
        productResponseDto.setName(product.getName());
        productResponseDto.setPrice(product.getPrice());
        productResponseDto.setStock(product.getStock());

        return productResponseDto;
    }

    @Override
    public ProductResponseDto saveProduct(ProductDto productDto) {
        Product product = new Product();
        product.setName(productDto.getName());
        product.setPrice(productDto.getPrice());
        product.setStock(productDto.getStock());
        product.setCreatedAt(LocalDateTime.now());
        product.setUpdatedAt(LocalDateTime.now());

        Product savedProduct = productDAO.insertProduct(product);

        ProductResponseDto productResponseDto = new ProductResponseDto();
        productResponseDto.setNumber(savedProduct.getNumber());
        productResponseDto.setName(savedProduct.getName());
        productResponseDto.setPrice(savedProduct.getPrice());
        productResponseDto.setStock(savedProduct.getStock());

        return productResponseDto;
    }
    
    @Override
    public ProductResponseDto changeProductName(Long number, String name) throws Exception {
        
        Product changedProduct = productDAO.updateProductName(number, name);

        ProductResponseDto productResponseDto = new ProductResponseDto();
        productResponseDto.setNumber(changedProduct.getNumber());
        productResponseDto.setName(changedProduct.getName());
        productResponseDto.setPrice(changedProduct.getPrice());
        productResponseDto.setStock(changedProduct.getStock());

        return productResponseDto;
    }

    @Override
    public void deleteProduct(Long number) throws Exception {
        productDAO.deleteProduct(number);
    }

}