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@Configuration
public class JacksonConfig {
	//配置文件里属性
   @Value("${spring.jackson.local-date-time-format:yyyy-MM-dd HH:mm:ss}")
   String localDateTimeFormat;
	//配置文件里属性
   @Value("${spring.jackson.local-date-format:yyyy-MM-dd}")
   String localDateFormat;
	//配置文件里属性
   @Value("${spring.jackson.local-time-format:HH:mm:ss}")
   String localTimeFormat;

   @Bean
   public ObjectMapper objectMapper() {
       ObjectMapper om = new ObjectMapper();
       JavaTimeModule javaTimeModule = new JavaTimeModule();
       //序列化
       javaTimeModule.addSerializer(LocalDateTime.class,
               new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(localDateTimeFormat)));
       javaTimeModule.addSerializer(LocalDate.class,
               new LocalDateSerializer(DateTimeFormatter.ofPattern(localDateFormat)));
       javaTimeModule.addSerializer(LocalTime.class,
               new LocalTimeSerializer(DateTimeFormatter.ofPattern(localTimeFormat)));
		//反序列化
       javaTimeModule.addDeserializer(LocalDateTime.class,
               new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(localDateTimeFormat)));
       javaTimeModule.addDeserializer(LocalDate.class,
               new LocalDateDeserializer(DateTimeFormatter.ofPattern(localDateFormat)));
       javaTimeModule.addDeserializer(LocalTime.class,
               new LocalTimeDeserializer(DateTimeFormatter.ofPattern(localTimeFormat)));
       om.registerModule(javaTimeModule);
       return om;
   }

}

实体类 不能加上@JsonFormat 注解

@Data
@TableName("am_contract")
@EqualsAndHashCode(callSuper = true)
@ApiModel(value = "合同信息")
public class AmContract extends BaseEntity<AmContract> {
   private static final long serialVersionUID = 1L;

   /**
    * 主键
    */
   @TableId(type = IdType.ASSIGN_ID)
   @ApiModelProperty(value = "主键")
   private Long id;
   /**
    * 合同号
    */
   @ApiModelProperty(value = "合同号")
   private String no;
   /**
    * 签订时间
    */
   @ApiModelProperty(value = "签订时间")
   //不能加上@JsonFormat 注解
   //@JsonFormat(shape = JsonFormat.Shape.STRING,pattern = "yyyy-MM-dd", timezone = "GMT+8")
   private LocalDateTime signTime;
   /**
    * 到期时间
    */
   @ApiModelProperty(value = "到期时间")
//    @JsonFormat(shape = JsonFormat.Shape.STRING,pattern = "yyyy-MM-dd", timezone = "GMT+8")
//    @JsonSerialize(using = LocalDateTimeSerializer.class)
//    @JsonDeserialize(using = LocalDateTimeDeserializer.class)
   private LocalDateTime expireTime;
   /**
    * 录入时间
    */
   @ApiModelProperty(value = "录入时间")
//    @JsonFormat(shape = JsonFormat.Shape.STRING,pattern = "yyyy-MM-dd", timezone = "GMT+8")
   private LocalDateTime recordTime;
   /**
    * 发货时间
    */
   @ApiModelProperty(value = "发货时间")
//    @JsonFormat(shape = JsonFormat.Shape.STRING,pattern = "yyyy-MM-dd", timezone = "GMT+8")
   private LocalDateTime deliveryTime;

}