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@see RestTemplate getForObject 方法获取List,Map 对象时 返回错误的LinkedHashMap
注意 jackson只知道您想要一个List,但对类型没有任何限制。
默认情况下,Jackson将JSON对象反序列化为LinkedHashMap,因此这就是为什么要获取的原因ClassCastException。
(必须用exchange 方法 + ParameterizedTypeReference + 映射类泛型化 指定泛型进行调用)
https://stackoverflow.com/questions/19463372
https://www.cnblogs.com/silentdoer/p/9012599.html