Jackson JSON序列化,通过级别定义的递归避免 [英] Jackson JSON serialization, recursion avoidance by level defining
问题描述
我使用Jackson库将我的pojo对象序列化为 JSON
表示。
例如我有A类和B类:
I use Jackson library for serialization of my pojo objects into JSON
representation.
For example I have class A and class B:
class A {
private int id;
private B b;
constructors...
getters and setters
}
class B {
private int ind;
private A a;
constructors...
getters and setters
}
如果我想从A类序列化对象,则在序列化时有可能获得递归。我知道我可以通过 @JsonIgnore
来阻止它。
If I want to serialize object from class A there is certain possibility to get recursion while it is serialized. I know i can stop it by using @JsonIgnore
.
是否可以限制序列化深度级别?
例如,如果级别为2,则序列化将采用以下方式:
For example, if the level is 2, the serialization will go this way:
- 序列化a,等级= 0(0 <2 ok) - >序列化
- 序列化ab,等级= 1
(1 < 2 ok) - >序列化 - 序列化aba,level = 2(2< 2不是真的) - >
stop
提前致谢。
推荐答案
我最近遇到过类似的问题:杰克逊 - 具有双向关系的实体的序列化(避免周期)
I recently encountered a similar problem: Jackson - serialization of entities with birectional relationships (avoiding cycles)
因此解决方案是升级到Jackson 2.0,并向类中添加以下注释:
So the solution is to upgrade to Jackson 2.0, and add to classes the following annotation:
@JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class,
property = "@id")
public class SomeEntityClass ...
这完美无缺。
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