@JsonIgnore 和 @JsonBackReference、@JsonManagedReference 之间的区别

问题描述

我知道@JsonIgnore 和@JsonManagedReference，@JsonBackReference 都是用来解决无限递归(StackOverflowError)代码>，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.上面演示案例的输出是:{"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，因为使用 @JsonIgnore 进行反序列化将只将该字段设置为 null，因此在我们的示例中 parentPlayer 将为 == null.

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

但是使用 @JsonManagedReference + @JsonBackReference 我们将在那里获得 Info 引用

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

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