如何使用模式格式化java.time.LocalDateTime和java.time.LocalDate？ [英] How to format java.time.LocalDateTime and java.time.LocalDate with pattern?

问题描述

在下面的剪辑中，属性 $ F 属于类 java.time.LocalDateTime 或 java.time.LocalDate 。

In the following snipped the property $F is of class java.time.LocalDateTime or java.time.LocalDate.

<textField pattern="EE. dd.MM.yyyy">
    <reportElement...>
    </reportElement>
    <textFieldExpression><![CDATA[$F{theLocalDateTime}]]></textFieldExpression>
</textField>

如何使用textField pattern 在jasper报告中？

How can I format this property with textField pattern in jasper reports?

推荐答案

在当前版本的jasper-report中使用模式属性您需要的日期/时间对象 java.util.Date 类或其中一个子类。

To use the pattern attribute in current version of jasper-report for Date/Time object you need a java.util.Date class or one of it's subclasses.

解决方案是转换 java.time.LocalDate 和 java.time.LocalDateTime

来自 java.time.LocalDate

<textField pattern="EE. dd.MM.yyyy">
    <reportElement...>
    </reportElement>
    <textFieldExpression><![CDATA[java.util.Date.from($F{theLocalDate}.atStartOfDay(java.time.ZoneId.systemDefault()).toInstant())]]></textFieldExpression>
</textField>

来自 java.time.LocalDateTime

<textField pattern="EE. dd.MM.yyyy">
    <reportElement...>
    </reportElement>
    <textFieldExpression><![CDATA[java.util.Date.from($F{theLocalDateTime}.atZone(java.time.ZoneId.systemDefault()).toInstant())]]></textFieldExpression>
</textField>

转换为 java.sql.Timestamp

来自 java.time.LocalDate

Converting to java.sql.Timestamp

from java.time.LocalDate

<textField pattern="EE. dd.MM.yyyy">
    <reportElement...>
    </reportElement>
    <textFieldExpression><![CDATA[java.sql.Timestamp.valueOf($F{theLocalDate}.atStartOfDay())]]></textFieldExpression>
</textField>

来自 java.time.LocalDateTime

from java.time.LocalDateTime

<textField pattern="EE. dd.MM.yyyy">
    <reportElement...>
    </reportElement>
    <textFieldExpression><![CDATA[java.sql.Timestamp.valueOf($F{theLocalDateTime})]]></textFieldExpression>
</textField>

注意：应用模式总是更可取解决方案，特别是当
导出到excel时，因为正确的类将被传递给poi（因此
excel会将列识别为日期并应用与
模式相同的格式）

Note: Applying pattern is always preferable solution, specially when exporting to excel since correct class will be passed to poi (hence excel will recognize column as a date and apply same formatting as in pattern)

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