@JsonIgnore和@JsonBackReference，@ JsonManagedReference之间的区别 [英] Difference between @JsonIgnore and @JsonBackReference, @JsonManagedReference

问题描述

我知道 @JsonIgnore 和 @JsonManagedReference ， @JsonBackReference 用于解决无限递归（StackOverflowError），这两者有什么区别？

I know both @JsonIgnore and @JsonManagedReference, @JsonBackReference are used to solve the Infinite recursion (StackOverflowError), what is the difference between these two?

注意：
这些是Jackson注释。

Note : These are Jackson annotations.

推荐答案

假设我们有

private class Player {
    public int id;
    public Info info;
}
private class Info {
    public int id;
    public Player parentPlayer;
}

// something like this:
Player player = new Player(1);
player.info = new Info(1, player);

---

序列化

@JsonIgnore

private class Info {
    public int id;
    @JsonIgnore
    public Player parentPlayer;
}

和 @JsonManagedReference + @JsonBackReference

private class Player {
    public int id;
    @JsonManagedReference
    public Info info;
}

private class Info {
    public int id;
    @JsonBackReference
    public Player parentPlayer;
}

将产生相同的输出。以上演示案例的输出是： {id：1，info：{id：1}}

will produce same output. And output for demo case from above is: {"id":1,"info":{"id":1}}

这是主要区别，因为反序列化与 @JsonIgnore
只会将null设置为该字段，因此在我们的示例中，parentPlayer将为== null。

Here is main difference, because deserialization with @JsonIgnore will just set null to the field so in our example parentPlayer will be == null.

但是使用 @JsonManagedReference + @JsonBackReference 我们会获取信息 referance那里

But with @JsonManagedReference + @JsonBackReference we will get Info referance there

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