带有 @JsonIgnore 的属性和没有注释的属性有什么区别? [英] What is the difference between a property with @JsonIgnore and one with no annotation?

问题描述

考虑以下类:

private static class Widget {

    @JsonProperty
    private String id = "ID";

    @JsonIgnore
    private String jsonIgnored = "JSON_IGNORED";

    private String noAnnotation = "NO_ANNOTATION";
}

如果我使用 Jackson 对其进行序列化，我最终会得到这个字符串:

If I serialize this using Jackson, I will end up with this string:

{"id":"ID"}

带有 @JsonIgnore 的属性和没有注释的属性有什么区别?

What is the difference between a property with @JsonIgnore and one with no annotation?

推荐答案

@JsonIgnore 注释的属性/方法不会被 Jackson 序列化/反序列化.而未注释的将是.

The @JsonIgnore annotated properties/methods will not be serialized/deserialized by Jackson. While the not annotated will be.

这里的问题是 Jackson 通常会查找 getter，而您没有指定任何 getter.所以这就是为什么它只序列化了@JsonProperty 注释的属性.

The problem here is that Jackson usually looks for the getters, and you didn't specified any getters. So that's why it's only serialized the @JsonProperty annotated property.

如果您为 3 个属性实现 3 个 getter，您的 json 将如下所示:

If you implement the 3 getters for the 3 properties, your json will look like this:

{
  "id":"ID",
  "noAnnotation":"NO_ANNOTATION"
}

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