使用Jackson将JSON中一个字段的不同类型的值映射到java对象。

import com.fasterxml.jackson.annotation.JsonAlias;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.ObjectMapper;

public class MyObject {
    @JsonProperty("field")
    @JsonAlias({"fieldInt", "fieldString"})
    private Object field;

    // Getters and setters

    public static void main(String[] args) {
        String json = "{\"field\": 123}";

        try {
            ObjectMapper objectMapper = new ObjectMapper();
            MyObject myObject = objectMapper.readValue(json, MyObject.class);

            System.out.println(myObject.getField()); // Output: 123
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}