GraphQL Spring Boot 使用

ゞ浴缸里的玫瑰 2022-04-23 08:52 174阅读 0赞

# GraphQL Spring Boot 使用 #

项目地址 [https://github.com/helloworlde/spring-boot-graphql-demo][https_github.com_helloworlde_spring-boot-graphql-demo]

> 使用 SpringBoot 和 GraphQL 创建一个最简单的增删改查接口应用，使用 MongoDB 存储数据

## 创建应用 ##

*  添加依赖

dependencies {
        implementation('org.springframework.boot:spring-boot-starter-web')
        implementation('org.springframework.boot:spring-boot-starter-data-mongodb')
    
        compileOnly('org.projectlombok:lombok')
        testImplementation('org.springframework.boot:spring-boot-starter-test')
    }

### 添加基础接口 ###

*  添加 Model

@Data
    @Builder
    @Document
    @AllArgsConstructor
    @NoArgsConstructor
    public class Post { 
    
        @Id
        private String id;
    
        private String title;
    
        private String content;
    
        @CreatedDate
        private Date createDate;
    }

*  添加 Repository

public interface PostRepository extends MongoRepository<Post, String> { 
    }

*  添加配置

# MongoDB Config
    spring.data.mongodb.host=localhost
    spring.data.mongodb.port=27017
    #spring.data.mongodb.username=
    #spring.data.mongodb.password=
    spring.data.mongodb.database=graphql

*  添加数据初始化

@Component
    @Slf4j
    public class DataInitializer implements ApplicationRunner { 
    
        @Autowired
        private PostRepository postRepository;
    
        @Override
        public void run(ApplicationArguments args) throws Exception { 
            List<Post> posts = initPost();
            posts.forEach(post -> log.info("Post: {}", post));
        }
    
        private List<Post> initPost() { 
            postRepository.deleteAll();
    
            return Stream.of("Post one", "Post two")
                    .map(title -> { 
                        Post post = Post.builder()
                                .title(title)
                                .content("Content of " + title)
                                .build();
                        return postRepository.save(post);
                    })
                    .collect(Collectors.toList());
        }
    }

### 添加 GraphQL 配置 ###

*  添加 GraphQL 依赖

implementation('com.graphql-java:graphql-spring-boot-starter:5.0.2')
        // 提供 UI    
        implementation('com.graphql-java:graphiql-spring-boot-starter:5.0.2')
        // 用于 Resolver    
        implementation('com.graphql-java:graphql-java-tools:5.2.4')

*  添加接口定义脚本

# io.github.helloworlde.graphql.model.Post 对应的Model
    type Post {
        id: ID,
        title: String,
        content: String,
        createDate: String
    }
    
    
    # io.github.helloworlde.graphql.resolver.PostMutation.updatePost 的入参 post
    input PostInput{
        title: String!,
        content: String!
    }
    
    # 查询 io.github.helloworlde.graphql.resolver.PostQuery
    type Query{
        posts: [Post]
        post(id: ID!): Post
    }
    
    # 修改 io.github.helloworlde.graphql.resolver.PostMutation
    type Mutation{
        createPost(post: PostInput): Post!
        updatePost(id: ID!, post: PostInput): Post!
        deletePost(id: ID!): String
    }

#### 添加接口 Resolver ####

*  查询 Resolver

@Component
    public class PostQuery implements GraphQLQueryResolver { 
    
        @Autowired
        private PostRepository postRepository;
    
        public List<Post> posts() { 
            return postRepository.findAll();
        }
    
        public Optional<Post> post(String id) { 
            return postRepository.findById(id);
        }
    
    }

*  修改 Resolver

@Component
    public class PostMutation implements GraphQLMutationResolver { 
    
        @Autowired
        private PostRepository postRepository;
    
        public Post createPost(Post post) { 
            Post newPost = Post.builder()
                    .title(post.getTitle())
                    .content(post.getContent())
                    .build();
    
            return postRepository.save(newPost);
        }
    
        public Post updatePost(String id, Post post) throws Exception { 
            Post currentPost = postRepository.findById(id)
                    .orElseThrow(() -> new IllegalArgumentException("Post " + id + " Not Exist"));
    
            currentPost.setTitle(post.getTitle());
            currentPost.setContent(post.getContent());
    
            return postRepository.save(currentPost);
        }
    
        public String deletePost(String id) throws Exception { 
            postRepository.findById(id)
                    .orElseThrow(() -> new IllegalArgumentException("Post " + id + " Not Exist"));
    
            postRepository.deleteById(id);
            return id;
        }
    }

## 测试 ##

*  启动应用
 *  访问 [http://localhost:8080/graphiql][http_localhost_8080_graphiql]

![GraphQL][]

#### 查询 ####

*  查询列表

{
      posts {
        id
        title
        content
        createDate
      }
    }

{ 
      "data": { 
        "posts": [
          { 
            "id": "5c50245b7ed65eacb3372aba",
            "title": "Post one",
            "content": "Content of Post one",
            "createDate": "Tue Jan 29 18:00:59 CST 2019"
          },
          { 
            "id": "5c50245b7ed65eacb3372abb",
            "title": "Post two",
            "content": "Content of Post two",
            "createDate": "Tue Jan 29 18:00:59 CST 2019"
          }
        ]
      }
    }

*  查询指定 id

{
      post(id: "5c50245b7ed65eacb3372aba") {
        id
        title
        content
        createDate
      }
    }

{ 
      "data": { 
        "post": { 
          "id": "5c50245b7ed65eacb3372aba",
          "title": "Post one",
          "content": "Content of Post one",
          "createDate": "Tue Jan 29 18:00:59 CST 2019"
        }
      }
    }

#### 修改 ####

*  新增

mutation {
      createPost(post: {title: "New Posts", content: "New Post Content"}) {
        id
        title
        content
        createDate
      }
    }

{ 
      "data": { 
        "createPost": { 
          "id": "5c5027197ed65eaf47a0854d",
          "title": "New Posts",
          "content": "New Post Content",
          "createDate": "Tue Jan 29 18:12:41 CST 2019"
        }
      }
    }

*  修改

mutation {
      updatePost(id: "5c5027197ed65eaf47a0854d", post: {title: "Update Posts", content: "Update Post Content"}) {
        id
        title
        content
        createDate
      }
    }

{ 
      "data": { 
        "updatePost": { 
          "id": "5c5027197ed65eaf47a0854d",
          "title": "Update Posts",
          "content": "Update Post Content",
          "createDate": "Tue Jan 29 18:12:41 CST 2019"
        }
      }
    }

*  删除

mutation {
      deletePost(id: "5c5027197ed65eaf47a0854d")
    }

{ 
      "data": { 
        "deletePost": "5c5027197ed65eaf47a0854d"
      }
    }

--------------------

### 参考文章 ###

*  [GraphQL][GraphQL 1]
 *  [Spring Boot + GraphQL + MongoDB][Spring Boot _ GraphQL _ MongoDB]
 *  [graphql-spring-boot][]
 *  [learn-graphql][]
 *  [graphql-mongodb-server][]

[https_github.com_helloworlde_spring-boot-graphql-demo]: https://github.com/helloworlde/spring-boot-graphql-demo
[http_localhost_8080_graphiql]: http://localhost:8080/graphiql
[GraphQL]: /images/20220322/51bd15574625457da496d2901c51bc77.png
[GraphQL 1]: http://graphql.cn/
[Spring Boot _ GraphQL _ MongoDB]: https://medium.com/oril/spring-boot-graphql-mongodb-8733002b728a
[graphql-spring-boot]: https://github.com/graphql-java-kickstart/graphql-spring-boot
[learn-graphql]: https://github.com/zhouyuexie/learn-graphql
[graphql-mongodb-server]: https://github.com/leonardomso/graphql-mongodb-server