# 如何處理Long類型精度丟失問題? >[info] 當實體類中的字段為`Long`類型，且值超過前端`js`顯示的長度范圍時會導致前端回顯錯誤。 ### 方法1 使用@JsonSerialize注解的時候把Long自動轉為String ``` @JsonSerialize(using = ToStringSerializer.class) private Long id; ``` ### 方法2 使用@JsonFormat注解的時候把Long自動轉為String ``` @JsonFormat(shape = JsonFormat.Shape.STRING) private Long id; ``` ### 方法3 全局配置org.jeecg.config.WebMvcConfiguration中添加如下代碼 ``` builder.serializerByType(Long.class, ToStringSerializer.instance); builder.serializerByType(Long.TYPE, ToStringSerializer.instance); ``` 具體配置如下 ``` @Bean public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() { return builder -> { DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"); //返回時間數據序列化 builder.serializerByType(LocalDateTime.class, new LocalDateTimeSerializer(formatter)); //接收時間數據反序列化 builder.deserializerByType(LocalDateTime.class, new LocalDateTimeDeserializer(formatter)); //序列化Long builder.serializerByType(Long.class, ToStringSerializer.instance); builder.serializerByType(Long.TYPE, ToStringSerializer.instance); }; } ```