Service

[conchincradle]

@Service注解用于类上，标记当前类是一个service类，加上该注解会将当前类自动注入到spring容器中，不需要再在applicationContext.xml文件定义bean了。

在调用该service的时候只需要将该类注入接口中即可： @Autowire 自动的找bean

if spring bean only one constructor, we can omit the annotation @Autowired

[conchincradle]

public interface PostService { PostDto createPost(PostDto postDto); }

[conchincradle]

@Service
public class PostServiceImpl implements PostService {
    private PostRepository postRepository;
    //@Autowired
    public PostServiceImpl(PostRepository postRepository) {
        this.postRepository = postRepository;
    }

    @Override
    public PostDto createPost(PostDto postDto) {

        // convert DTO to entity
        Post post = new Post();
        post.setTitle(postDto.getTitle());
        post.setDescription(postDto.getDescription());
        post.setContent(postDto.getContent());

        Post newPost = postRepository.save(post);

        // convert entity to DTO

        PostDto postResponse = new PostDto();
        postResponse.setId(newPost.getId());
        postResponse.setContent(newPost.getContent());
        postResponse.setDescription(newPost.getDescription());
        postResponse.setTitle(newPost.getTitle());

        return postResponse;

    }
}