在Spring Boot 2.4(Jackson)中将字符串数据类型限制为仅请求正文的字符串类型 [英] Restrict string data type to only string types for request body in Spring boot 2.4 (Jackson)

问题描述

我已经按照以下步骤创建了请求POJO

I have created my request POJO as follows

@JsonInclude(JsonInclude.Include.NON_NULL)
public class Notification {

    @NotNull
    private String clientId;
    private String userId;  
    @NotNull
    private String requestingService;
    @NotNull
    private String message;
    @NotNull
    private String messageType;

当我按以下方式发送请求正文时，它工作正常.

when I send request body as follow, it is working fine.

{
   "clientId":"9563",
    "userId":"5855541",
    "requestingService":"cm-dm-service",
    "message":"Document Created",
    "messageType":"user-msg"
}

但是当我像下面这样发送时

But when I sent like below

{
   "clientId":"9563",
    "userId":true,
    "requestingService":"cm-dm-service",
    "message":"Document Created",
    "messageType":"user-msg"
}

这是我的控制人

public ResponseEntity<Status> createNotification(@RequestBody @Valid Notification notification,
            BindingResult bindingResult, HttpServletRequest request) throws AppException {

预期:抛出一些错误

实际:将 userId 的 true 值转换为杰克逊的字符串.

Actual: converting true value for userId to string by jackson.

请让我知道，有没有一种方法可以实现预期行为

please let me know is there a way to acheive the Expected behaviour

推荐答案

杰克逊NumberDeserializers.BooleanDeserializer被编程为将布尔值转换为字符串.

The jackson NumberDeserializers.BooleanDeserializer is programmed to convert boolean to String.

我们可以用我们的替代反序列化器，并阻止转换并抛出异常.

We can override the deserializer with ours and prevent the conversion and throw an exception instead.

我可以举一个例子，您尝试将其实施到您的问题陈述中.

I can give you an example, you try to implement it to your problem statement.

1. 创建一个布尔反序列化类

    public class MyDeser extends JsonDeserializer {
        @Override
        public String deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {
            JsonToken t = p.getCurrentToken();
            if (t.isBoolean()) {
                throw new Exception();
            }
            else if (t.isNumeric()) {
                throw new Exception();
            }
            else if (t == JsonToken.VALUE_STRING) {
                return p.getValueAsString();
            }
            return null;
        }
    }

1. 现在将反序列化器注入到我们的应用程序中

    @SpringBootApplication
     @Configuration
     public class Application {
         @Bean
         public SimpleModule injectDeser() {
             return new SimpleModule().addDeserializer(String.class, new MyDeser());
         }
         public static void main(String[] args) {
             SpringApplication.run(Application.class, args);
         }
     }

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