JacksonのPropertyNamingStrategyまとめ ref: https://qiita.com/Shoone/items/5d23dfcc8687ba2305fe

file0.txt

    @SneakyThrows
    public static void main(String[] args) {
        ObjectMapper mapper = new ObjectMapper();
        print("PropertyNamingStrategy", mapper.writeValueAsString(new CamelCase()));
        print("UpperCamelCaseStrategy", mapper.writeValueAsString(new PascalCase()));
        print("SnakeCaseStrategy", mapper.writeValueAsString(new SnakeCase()));
        print("KebabCaseStrategy", mapper.writeValueAsString(new KebabCase()));
        print("LowerCaseStrategy", mapper.writeValueAsString(new LowerCase()));
    }

    private static void print(String strategy, String json) {
        String format = "%-23s: %s";
        System.out.println(String.format(format, strategy, json));
    }

    @Getter
    // デフォルトはこれ。アノテーションを省略しても同じ
    @JsonNaming(PropertyNamingStrategy.class)
    static class CamelCase {
        private String testString = "hoge";
    }

    @Getter
    @JsonNaming(PropertyNamingStrategy.UpperCamelCaseStrategy.class)
    static class PascalCase {
        private String testString = "fuga";
    }

    @Getter
    @JsonNaming(PropertyNamingStrategy.SnakeCaseStrategy.class)
    static class SnakeCase {
        private String testString = "piyo";
    }

    @Getter
    @JsonNaming(PropertyNamingStrategy.KebabCaseStrategy.class)
    static class KebabCase {
        private String testString = "hogera";
    }

    @Getter
    @JsonNaming(PropertyNamingStrategy.LowerCaseStrategy.class)
    static class LowerCase {
        private String testString = "hogehoge";
    }

file1.txt

PropertyNamingStrategy : {"testString":"hoge"}
UpperCamelCaseStrategy : {"TestString":"fuga"}
SnakeCaseStrategy      : {"test_string":"piyo"}
KebabCaseStrategy      : {"test-string":"hogera"}
LowerCaseStrategy      : {"teststring":"hogehoge"}