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WriteNull_cn

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高铁 edited this page Oct 28, 2016 · 2 revisions

输入输出空值

在fastjson中，缺省是不输出空值的。无论Map中的null和对象属性中的null，序列化的时候都会被忽略不输出，这样会减少产生文本的大小。但如果需要输出空值怎么做呢？

使用SerializerFeature.WriteMapNullValue

Model obj = ...;
JSON.toJSONString(obj, SerializerFeature.WriteMapNullValue);

空值特别处理

SerializerFeature 描述
WriteNullListAsEmpty 将Collection类型字段的字段空值输出为[]
WriteNullStringAsEmpty 将字符串类型字段的空值输出为空字符串 ""
WriteNullNumberAsZero 将数值类型字段的空值输出为0
WriteNullBooleanAsFalse 将Boolean类型字段的空值输出为false 
class Model {
      public List<Objec> items;
}

Model obj = ....;

String text = JSON.toJSONString(obj, SerializerFeature.WriteMapNullValue, SerializerFeature.WriteNullListAsEmpty);

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