java - Jackson:如何在运行时使用泛型解码到类？

Question

我需要在运行时使用泛型将 json 字符串解码为类。像这样的东西:

String classname = "this.is.a.class.name.read.at.runtime";
Class cls = Class.forName(classname);
mapper.readValue(jsonPayload, new TypeReference<GenericClass<cls>>() {});

显然，上述方法行不通，我也找不到好的解决方案。

Answer 1

以下代码解决了我的问题:

String genericParameterClassName = "this.is.a.class.name.read.at.runtime";
Class clazz = Class.forName(genericParameterClassName);
JavaType = mapper.getTypeFactory().constructParametrizedType(GenericClass.class,GenericClass.class,clazz);
GenericClass m = mapper.readValue(jsonPayload, type);