Jacksonã使ã£ã¦ãJava Objectãjsonã«å¤æããå ´åã®ã³ã¼ãã§ããJava Objectã¯publicã®ãã£ã¼ã«ããããã°getterã¯ãªãã¦ãããã§ãã ObjectMapper mapper = new ObjectMapper(); String json = mapper.writeValueAsString(bean); jsonã«ã¯ãbeanã®ããããã£åããã¼ã¨ããã¤ã¡ã¼ã¸ãåºåããã¾ããããããã£åã¨ç°ãªããã¼ã«ããå ´åã«ã¯ã@JsonPropertyã使ç¨ãããã¨ãã§ãã¾ãã public class Bean { @JsonProperty("user_id") public Integer id; public String name; } ãã®Beanã¯ã©ã¹ããjsonã«å¤æããã¤ã¡ã¼ã¸ã¯ä¸ã®ããã«ãªãã¾ãã {"user_id":null,"na


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