杰克逊：将null字符串反序列化为空字符串

问题描述：

我有以下类，由Jackson（简化版）映射：

I have the following class, that is mapped by Jackson (simplified version):

public class POI {
    @JsonProperty("name")
    private String name;
}

在某些情况下，服务器返回name： null 然后我想将name设置为空Java String。

In some cases the server returns "name": null and I would like to then set name to empty Java String.

是否有任何Jackson注释或我应该检查内部的null我的getter并返回空字符串，如果属性是 null ？

Is there any Jackson annotation or should I just check for the null inside my getter and return empty string if the property is null?

答

您可以在默认构造函数中设置它，也可以在声明中设置它：

You can either set it in the default constructor, or on declaration:

public class POI {
    @JsonProperty("name")
    private String name; 

    public POI() {
        name = "";
    }
}

public class POI {
    @JsonProperty("name")
    private String name = "";
}