阻止Jackson中的自动String to Integer转换 [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文档被正确反序列化为 ADate ：

The following JSON Document gets deserialized correctly into ADate:

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

杰克逊自动将字符串转换为整数。

Jackson converts the String into Integer automatically.

有没有办法避免这种自动转换并拥有杰克逊如果将Integer值定义为String，则失败。

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

我在Jackson github上发现了一些有趣的代码问题。改变了一点，这就是我得到的：

I've found the some interesting code on Jackson github issues. Changed it a little and that's what I got:

public class ForceIntegerDeserializer extends JsonDeserializer<Integer> {

    @Override
    public int deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
        if (jsonParser.getCurrentToken() != JsonToken.VALUE_NUMBER_INT) {
            throw deserializationContext.wrongTokenException(jsonParser, JsonToken.VALUE_STRING, "Attempted to parse String to int but this is forbidden");
        }
        return jsonParser.getValueAsInt();
    }
}

这篇关于阻止Jackson中的自动String to Integer转换的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！