koltin 如何使用Jackson的ObjectMapper()获取json中的值

最新推荐文章于 2024-11-14 10:41:26 发布

原创最新推荐文章于 2024-11-14 10:41:26 发布 · 416 阅读

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#maven #jar #java

本文介绍如何使用Java的Jackson库定制ObjectMapper，实现LocalDateTime和ZonedDateTime的自定义序列化，以及如何将对象转换为PDF并保存。重点在于时间序列处理和文件操作的简化方法。

	fun getObjectMapper(): ObjectMapper {
		return ObjectMapper().registerModule(
			JavaTimeModule().addSerializer(
				LocalDateTime::class, LocalDateTimeSerializer(DateTimeFormatter.ISO_LOCAL_DATE_TIME)
			).addSerializer(
				ZonedDateTime::class, ZonedDateTimeSerializer(DateTimeFormatter.ISO_OFFSET_DATE_TIME)
			).addSerializer(YearMonth::class, YearMonthSerializer(DateTimeFormatter.ofPattern("yyyy-MM")))
		).configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true)
	}

inline fun <reified T> ObjectMapper.objectToMap(obj: T): Map<String, Any> =
	this.readValue(this.writeValueAsString(obj), object : com.fasterxml.jackson.core.type.TypeReference<Map<String, Any>>() {})

	fun outputPdfFile(bill: Any): File {
		val jsonNode= getObjectMapper().objectToMap(bill)
		val customerName = BillingStackConfig.getConfig().fastoneBilling.customer.name
		return Path.of(
			PathConst.OUTPUT_PATH,
			PathConst.BILL_FOLDER,
			jsonNode["billingCycle"].toString(),
			"$customerName-${jsonNode.get("billingCycle")}-bill.pdf"
		).toFile()
	}