防止在 Jackson 中自动将字符串转换为整数 [英] Prevent automatic String to Integer conversion in Jackson

问题描述

我有一个简单的 POJO:

I have a simple POJO:

public class ADate {
    private Integer day;
    private Integer month;
    private Integer year;
    ... // getters/setters/constructor
}

以下 JSON 文档正确反序列化为 ADate:

The following JSON Document gets deserialized correctly into ADate:

{ 
  "day":"10", 
  "month":"2", 
  "year":"1972"
}

Jackson 自动将字符串转换为整数.

Jackson converts the String into Integer automatically.

如果整数值定义为字符串，有没有办法避免这种自动转换并让杰克逊失败.

Is there a way to avoid this automatic conversion and have Jackson to fail if the Integer values are defined as String.

推荐答案

ObjectMapper 上有一个配置设置，称为 MapperFeature.ALLOW_COERCION_OF_SCALARS.如果设置为 false，它将阻止 ObjectMapper 将数字和布尔值的字符串表示强制转换为它们的 Java 对应项.只允许严格转换.

There is a configuration setting on the ObjectMapper called the MapperFeature.ALLOW_COERCION_OF_SCALARS. If set to false, it will prevent ObjectMapper from coercing String representations of numbers and booleans into their Java counterparts. Only strict conversions will be allowed.

具体用法示例:

objectMapper.configure(MapperFeature.ALLOW_COERCION_OF_SCALARS, false);

参考文献:

[1] 添加 MapperFeature.ALLOW_COERCION_OF_SCALARS 以启用/禁用强制转换 #1106:https://github.com/FasterXML/jackson-databind/issues/1106

[1] Add MapperFeature.ALLOW_COERCION_OF_SCALARS for enabling/disabling coercions #1106: https://github.com/FasterXML/jackson-databind/issues/1106

[2] 如果 DeserializationFeature .FAIL_ON_NULL_FOR_PRIMITIVES 是 true，则防止将 int 从空字符串强制转换为 null代码> #1095: https://github.com/FasterXML/jackson-数据绑定/问题/1095

[2] Prevent coercion of int from empty String to null if DeserializationFeature .FAIL_ON_NULL_FOR_PRIMITIVES is true #1095: https://github.com/FasterXML/jackson-databind/issues/1095

[3] ALLOW_COERCION_OF_SCALARS http://fasterxml.github.io/jackson-databind/javadoc/2.9/

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