Java泛型 | Jackson TypeReference获取泛型类型信息

前言

Jackson是一个比较流行的Json序列化和反序列化框架。本文以Jackson为例介绍TypeReference实现涉及泛型的反序列化，及TypeReference的实现原理。对于获取泛型类型信息的场景，TypeReference是一个可以参考的通用解决方案。

实例

Jackson ObjectMapper的readValue可以将Json字符串反序列化为Java对象。如下例中将 [{"id":null,"name":" ","age":500,"gender":false,"email":"email","employed":true,"salary":10}] 反序列化为 List<UserResource> 类型。

Json字符串：

[{
    "id": null,
    "name": " ",
    "age": 500,
    "gender": false,
    "email": "email",
    "employed": true,
    "salary": 10
}]

UserResource实体类：

@Builder
@Data
@NoArgsConstructor
@AllArgsConstructor
public class UserResource {
    private UUID id;
    private String name;
    private int age;
    private boolean gender;
    private String email;
    private boolean employed;
    private BigDecimal salary;