I'm trying to use Jackson to read/write my POJOs to/from Json. As of right now, I've got it configured and working for my classes, except for a 3rd party class. When trying to read in the Json I get the error:
我正试着用杰克逊来读/写我的pojo /从Json。到目前为止，我已经为我的类配置好了它并开始工作，除了一个第三方类。当尝试读取Json时，我得到了错误:
org.codehaus.jackson.map.JsonMappingException: No suitable constructor found for type
After a few quick google searches, it appears that my class needs either a default constructor or to override the default constructor with annotations. Unfortunately, the class in which this is failing is from a 3rd party library and that class does not have a default constructor and I obviously cannot over-write the code.
在快速搜索谷歌之后，我的类似乎需要一个默认构造函数，或者使用注释覆盖默认构造函数。不幸的是，失败的类来自第三方库，该类没有默认的构造函数，我显然不能重写代码。
So my question is, is there anything I can do about this or am I just out of luck?
所以我的问题是，我能做些什么，或者我只是运气不好?
Thanks.
谢谢。
1 个解决方案
#1
23
You could make use of Jackson's Mix-Ins feature, coupled with the Creator feature. The Mix-Ins feature alleviates the need to annotate the original third-party code, and the Creator feature provides a mechanism for custom instance creation.
您可以使用Jackson的混搭特性，以及Creator特性。mix - in特性减少了注释原始第三方代码的需要，而Creator特性提供了自定义实例创建机制。
For yet more customization, it's not too involved to write a custom deserializer.
对于更多的自定义，它不需要编写自定义的反序列化器。
#1
23
You could make use of Jackson's Mix-Ins feature, coupled with the Creator feature. The Mix-Ins feature alleviates the need to annotate the original third-party code, and the Creator feature provides a mechanism for custom instance creation.
您可以使用Jackson的混搭特性，以及Creator特性。mix - in特性减少了注释原始第三方代码的需要，而Creator特性提供了自定义实例创建机制。
For yet more customization, it's not too involved to write a custom deserializer.
对于更多的自定义，它不需要编写自定义的反序列化器。