graphql使用步骤

一、创建一个SpringBoot项目，并导入下方依赖

二、配置 application.properties文件

 三、在resources下创建graphql目录，并在graphql下创建三个.graphql文件（main.graphql , person.graphql , user.graphql）

 mani.graphql 中的内容

 person.graphql 中的内容

 user.graphql中的内容

四、 创建类

 1. 创建与下方图片相同的层级目录

2. Person类、Sex类和User类中代码

3. PersonFieldResolver类中代码

4. UserInput类和PersonInput类中的代码

5. MutationTest类、PersonMutation类和UserMutation类中的代码

6. PersonQuery类、QueryTest类、UserQuery类中代码

7.ScalarDate类中的代码

8.DemoApplication类中的代码

五、使用浏览器打开 http://127.0.0.1:8080/playground 网站 

 在左边编写指令获取数据 

• graphql使用步骤

一、创建一个SpringBoot项目，并导入下方依赖

        
        
            com.graphql-java-kickstart
            graphql-spring-boot-starter
            11.0.0
        
        
        
            com.graphql-java-kickstart
            playground-spring-boot-starter
            7.1.0
            runtime
        

        
        
            org.projectlombok
            lombok
            true
        

二、配置 application.properties文件

graphql.tools.schema-location-pattern=./graphql
@Component
public class PersonFieldResolver implements GraphQLResolver {
    
    public User user(Person person){
        return new User("1","wjy", Sex.MALE,"yqy");
    }

    
    public List list(Person person){
        return Arrays.asList("e","f","g");
    }

}

4. UserInput类和PersonInput类中的代码

@Getter
public class UserInput {
    String name;
    Sex sex;
    String text;
}

@Getter
public class PersonInput {
    String name;
    Sex sex;
    String text;
}

5. MutationTest类、PersonMutation类和UserMutation类中的代码

@Component
public class MutationTest implements GraphQLMutationResolver {
    
    public LocalDateTime createEvents1(LocalDateTime date){
        return date;
    }

}

@Component
public class PersonMutation implements GraphQLMutationResolver {
    
    static public Map map=new ConcurrentHashMap<>();
    
    public Person createPerson(PersonInput personInput){
        Person person=new Person(UUID.randomUUID().toString(),personInput.getName(),personInput.getSex(),personInput.getText());
        map.put(person.getId(),person);
        System.out.println("Person map size:"+map.size());
        return person;
    }

}

@Component
public class UserMutation implements GraphQLMutationResolver {

    static public Map map=new ConcurrentHashMap<>();
    
    public User createUser(UserInput userInput){
        User user =new User(UUID.randomUUID().toString(),userInput.getName(),userInput.getSex(),userInput.getText());
        map.put(user.getId(), user);
        System.out.println("User map size:"+map.size());
        return user;
    }

}

6. PersonQuery类、QueryTest类、UserQuery类中代码

@Component
public class PersonQuery implements GraphQLQueryResolver {
    
    public Person personQuery1(){
        Person person=new Person(UUID.randomUUID().toString(),"xxx", Sex.MALE,"xxx");
        return person;
    }

    public Person personQuery2(String id){
        return PersonMutation.map.get(id);
    }
}

@Component
public class QueryTest implements GraphQLQueryResolver {
    
    public List events1(){
        List list= Arrays.asList(LocalDateTime.now(),LocalDateTime.now());
        return list;
    }

}

@Component
public class UserQuery implements GraphQLQueryResolver {
    
    public User userQuery1(){
        User user =new User("1","xxx", Sex.MALE,"xxx");
        return user;
    }

    public User userQuery2(String id){
        return UserMutation.map.get(id);
    }
}

7.ScalarDate类中的代码

@Component
public class ScalarDate extends GraphQLScalarType {
    public ScalarDate() {
        //第一个参数的值必须和 main.graphql 文件中 scalar 定义的相同，第二个可以随意起名
        super("Date", "日期", new Coercing() {
            
            @Override
            public String serialize(Object o) throws CoercingSerializeException {

                System.out.println("serialize-->"+(LocalDateTime)o);
                return o.toString();
            }

            @Override
            public LocalDateTime parseValue(Object o) throws CoercingParseValueException {
                StringValue string=(StringValue)o;
                System.out.println("parseLiteral-->"+string.getValue());
                System.out.println("parseLiteral-->"+string.toString());
                return LocalDateTime.parse(string.getValue());
            }

            
            @Override
            public LocalDateTime parseLiteral(Object o) throws CoercingParseLiteralException {
                StringValue string=(StringValue)o;
                System.out.println("parseLiteral-->"+string.getValue());
                System.out.println("parseLiteral-->"+string.toString());
                return LocalDateTime.parse(string.getValue());
            }
        });
    }
}

8.DemoApplication类中的代码

@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    @Slf4j
    @Component
    @RequiredArgsConstructor
    private static class AppRunner implements ApplicationRunner {
        @Override
        public void run(ApplicationArguments args) {
            log.info("graphql playground: http://127.0.0.1:{}/playground", "8080");
        }
    }

}

五、使用浏览器打开 http://127.0.0.1:8080/playground 网站 

 在左边编写指令获取数据 

 自己记录的一些笔记，内容如有不对请指正