优化JaxRS / Jackson以排除空值，空列表，数组 [英] Optimizing JaxRS/Jackson to exclude nulls, empty Lists, arrays

问题描述

我们正在使用JaxRS&杰克逊将数据发送给我们的客户。由于客户端是Javascript，如果没有该属性的有效值（默认情况下JaxRS默认），我们实际上不需要发送空值或空数组。有没有办法解决这个问题？

We're using JaxRS & Jackson to send data to our client. Since the client is Javascript, we don't really need to send null values or empty arrays if there isn't a valid value for that property (which JaxRS does by default). Is there a way around this?

一个例子。 JaxRS发送此信息：

An example. JaxRS sends this:


{prop1：[]，prop2：null，prop3：foo }


我们可能已经离开了


{prop3：foo}


推荐答案

有多种方法可以实现这一目标，具体取决于：注释 @JsonSerialize（include = JsonSerialize.Inclusion.NON_NULL）是单向的。或者，因为您还想删除空列表，数组，所以将NON_NULL更改为NON_EMPTY。

There are multiple ways to achieve this, depending; annotation @JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL) is one way. Or, since you also want to drop empty Lists, arrays, change NON_NULL to NON_EMPTY.

也可以将此配置为默认行为;在Jackson 1.9：

It is also possible to configure this as the default behavior; in Jackson 1.9:

mapper.setSerializationConfig(mapper.getSerializationConfig().withSerializationInclusion(
  JsonSerialize.Inclusion.NON_EMPTY));

在Jackson 2.0中，更简单：

and in Jackson 2.0, bit simpler:

mapper.setSerializationInclusion(JsonSerialize.Inclusion.NON_EMPTY);

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