java - 将 JSON HttpMessageConverters 与 Spring Boot 结合使用

Question

当调用我的 API 时，我尝试使用 HTTPMessageConverters 将 JSON 输入转换为对象。但是，当我尝试将 API 输入映射到 POJO 时，我看到一条错误消息。鉴于错误消息，我认为问题与 CreateUserRequest 类实现有关。任何建议将不胜感激!请看下面:

错误消息:

{
"timestamp": 1515127031483,
"status": 400,
"error": "Bad Request",
"exception": "org.springframework.http.converter.HttpMessageNotReadableException",
"message": "Could not read document: Cannot construct instance of `com.api.service.request.CreateUserRequest`, problem: email\n at [Source: (PushbackInputStream); line: 6, column: 1]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `com.api.service.request.CreateUserRequest`, problem: email\n at [Source: (PushbackInputStream); line: 6, column: 1]",
"path": "/create"
}

API 输入:

curl -X PUT \
http://localhost:8080/create \
-H 'authorization: Basic Ymx1bWV3OjEyMw==' \
-H 'cache-control: no-cache' \
-H 'content-type: application/json' \
-d '{
    "CreateUserRequest" : {
        "email" : "--REDACTED--",
        "password" : "--REDACTED--"
    }
}'

API Controller :

@RestController
public class BaseActivity {

@RequestMapping(path = "/create", method = RequestMethod.PUT)
@ResponseStatus(HttpStatus.OK)
public @ResponseBody String createUser (final @RequestBody CreateUserRequest createUserRequest) { ... }

WebConfig:

@EnableWebMvc
@Configuration
@ComponentScan(basePackages = {"com.api.service"})
public class ActivityConfig extends WebMvcConfigurerAdapter {

    @Override
    public void configureMessageConverters(
        List<HttpMessageConverter<?>> converters) {
        converters.add(mappingJackson2HttpMessageConverter());
        super.configureMessageConverters(converters);
    }

    @Bean
    public MappingJackson2HttpMessageConverter 
        mappingJackson2HttpMessageConverter() {
        MappingJackson2HttpMessageConverter jsonConverter = new 
            MappingJackson2HttpMessageConverter();
        ObjectMapper objectMapper = new ObjectMapper() 
        .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        jsonConverter.setObjectMapper(objectMapper);
        return jsonConverter;
    }
}

请求对象:

@Data
@NoArgsConstructor
@AllArgsConstructor
public class CreateUserRequest implements Serializable {

    private static final long serialVersionUID = 4260711945094777831L;

    @NonNull
    private String email;

    @NonNull
    private String password;
}

注意:当我替换 createUserRequest 类中的 lombok 注释时，会调用 API，但电子邮件/密码属性为空。

Answer 1

你的RequestBody是这样的

{
    "CreateUserRequest" : {
        "email" : "--REDACTED--",
        "password" : "--REDACTED--"
    }
}

但我认为应该像下面这样:

{
  "email" : "--REDACTED--",
  "password" : "--REDACTED--"
}