FlexJSON在反序列化时排除属性 [英] FlexJSON Exclude Properties Upon Deserialization

问题描述

我正在从Web服务收到JSON响应，但由于各种原因，我不希望在最终响应对象中反序列化某些属性。例如，我有：

I'm receiving a JSON response from a web service, but for various reasons I don't want to have certain properties deserialized in the final response object. For example I have:

public class Foo {
    private String bar;
    private int baz;

    //getters & setters
}

我回来的JSON响应有两个属性，但在反序列化时我不希望设置bar。原因是他们发送的属性很长，但是我们的是一个String，所以反序列化会抛出IllegalArgumentException。

The JSON response I'm getting back has both properties, but upon deserialization I don't want "bar" to be set. The reason for this is that the property they're sending is a long, but ours is a String, so deserializing throws an IllegalArgumentException.

另一种选择是解析使用类似json-simple的JSON，删除我想要的属性，将其转换回JSON并将其传递给反序列化器，但是如果可能的话我想避免使用JSON非常大。

Another option would be to parse the JSON with something like json-simple, remove the properties I want, convert it back to JSON and pass that into the deserializer, but I'd like to avoid that if possible since the JSON is pretty large.

有没有办法用ObjectFactory做这个？

Is there a way to do this with an ObjectFactory perhaps?

推荐答案

是的，ObjectFactory可能是用于允许从Long转换为String。只需在您的路径上注册ObjectFactory，如：

Yes an ObjectFactory could be used to allow a conversion from Long to String. Simply register the ObjectFactory on your path like:

new JSONDeserializer().use("some.path.to.bar", new EnhancedStringObjectFactory() ).deserialize( json, new SomeObject() );



public class EnhancedStringObjectFactory implements ObjectFactory {
    public Object instantiate(ObjectBinder context, Object value, Type targetType, Class targetClass) {
        if( value instanceof String ) {
            return value;
        } else if( value instanceof Number ) {
            return ((Number)value).toString();
        } else {
           throw context.cannotConvertValueToTargetType(value, String.class);
        }
   }
}

你甚至可以注册为String的默认ObjectFactory，它将处理进入反序列化程序的任何String的情况：

You could even register that as the default ObjectFactory for String and it would handle that case for any String coming into the deserializer:

new JSONDeserializer().use( String.class, new EnhancedStringObjectFactory() ).deserialize( json, new SomeObject() );

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