如何为嵌套列表中的奇数列表项着色？
How to color odd list items in nested list?
我得到了以下json
{
"data": [
{
"name": "apple",
"sorts": [
{ "name": "green", "number": "6", "comment": "green apples are nice" },
{ "name": "yellow", "number": "1" },
{ "name": "red", "number": "2" }
]
},
{
"name": "banana",
"sorts": [
]
},
{
"name": "pear",
"sorts": [
{ "name": "green", "number": "6", "comment": "green pears are sour" },
{ "name": "purple", "number": "0", "comment": "so far we haven't seen purple pears" }
]
}
]
}
这是我想要的结果：
我用 2 个嵌套列表创建了这个并将名称传递给嵌套列表。
这很好用，但现在我想给奇数列表项上色。那就是黄苹果和绿梨。我在一个简单的列表上找到了一些关于如何执行此操作的示例，但我有一个嵌套列表，所以它不起作用。
JRXML:
<?xml version="1.0" encoding="UTF-8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="Blank_A4" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20">
<subDataset name="DatasetFruits">
<queryString language="JSON">
<![CDATA[data]]>
</queryString>
<field name="name" class="java.lang.String">
<property name="net.sf.jasperreports.json.field.expression" value="name"/>
<fieldDescription><![CDATA[name]]></fieldDescription>
</field>
<field name="sorts" class="java.lang.String">
<property name="net.sf.jasperreports.json.field.expression" value="sorts"/>
<fieldDescription><![CDATA[sorts]]></fieldDescription>
</field>
</subDataset>
<subDataset name="DatasetFruitsSort">
<parameter name="FRUIT_NAME" class="java.lang.String"/>
<queryString language="JSON">
<![CDATA[data.sorts]]>
</queryString>
<field name="name" class="java.lang.String">
<property name="net.sf.jasperreports.json.field.expression" value="name"/>
<fieldDescription><![CDATA[name]]></fieldDescription>
</field>
<field name="number" class="java.lang.Integer">
<property name="net.sf.jasperreports.json.field.expression" value="number"/>
<fieldDescription><![CDATA[number]]></fieldDescription>
</field>
<field name="comment" class="java.lang.String">
<property name="net.sf.jasperreports.json.field.expression" value="comment"/>
<fieldDescription><![CDATA[comment]]></fieldDescription>
</field>
</subDataset>
<detail>
<band height="125" splitType="Stretch">
<componentElement>
<reportElement x="-20" y="43" width="595" height="30"/>
<jr:list xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd">
<datasetRun subDataset="DatasetFruits">
<dataSourceExpression><![CDATA[((net.sf.jasperreports.engine.data.JsonDataSource)$P{REPORT_DATA_SOURCE}).subDataSource("data")]]></dataSourceExpression>
</datasetRun>
<jr:listContents height="30" width="595">
<componentElement>
<reportElement x="0" y="0" width="595" height="30" isRemoveLineWhenBlank="true">
<printWhenExpression><![CDATA[!$F{sorts}.equals("[]")]]></printWhenExpression>
</reportElement>
<jr:list>
<datasetRun subDataset="DatasetFruitsSort">
<datasetParameter name="FRUIT_NAME">
<datasetParameterExpression><![CDATA[$F{name}]]></datasetParameterExpression>
</datasetParameter>
<dataSourceExpression><![CDATA[((net.sf.jasperreports.engine.data.JsonDataSource)$P{REPORT_DATA_SOURCE}).subDataSource("sorts")]]></dataSourceExpression>
</datasetRun>
<jr:listContents height="30" width="595">
<textField>
<reportElement x="0" y="0" width="100" height="30"/>
<textFieldExpression><![CDATA[$P{FRUIT_NAME}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="180" y="0" width="100" height="30"/>
<textFieldExpression><![CDATA[$F{number}]]></textFieldExpression>
</textField>
<textField isBlankWhenNull="true">
<reportElement x="400" y="0" width="190" height="30"/>
<textFieldExpression><![CDATA[$F{comment}]]></textFieldExpression>
</textField>
</jr:listContents>
</jr:list>
</componentElement>
</jr:listContents>
</jr:list>
</componentElement>
</band>
</detail>
</jasperReport>
如果您使用的是 JasperReports 6.3.1 或更新版本，最简单的解决方案是切换到 JSONQL 并使用单个列表而不是嵌套列表。您可以阅读有关 JSONQL 数据源的信息 here.
使用 JSONQL，您可以拥有一个遍历所有 data.sorts.* 节点的列表，并通过树上的字段获取水果名称。然后使用单个列表，您可以使用简单的条件样式来为奇数行着色。
整个事情看起来像这样：
<?xml version="1.0" encoding="UTF-8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="Blank_A4" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="af456afc-4615-4564-8841-81929ce2447f">
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="Adapter"/>
<style name="listRow">
<conditionalStyle>
<conditionExpression><![CDATA[$V{REPORT_COUNT} % 2 == 0]]></conditionExpression>
<style mode="Opaque" backcolor="#FFFF00"/>
</conditionalStyle>
</style>
<subDataset name="DatasetFruitsSortAll" uuid="5961129e-70f0-4d98-8d4e-524f2bbb28f9">
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="Adapter"/>
<queryString language="JSONQL">
<![CDATA[data.sorts]]>
</queryString>
<field name="fruitName" class="java.lang.String">
<property name="net.sf.jasperreports.jsonql.field.expression" value="^^.name"/>
<fieldDescription><![CDATA[fruitName]]></fieldDescription>
</field>
<field name="name" class="java.lang.String">
<property name="net.sf.jasperreports.json.field.expression" value="name"/>
<fieldDescription><![CDATA[name]]></fieldDescription>
</field>
<field name="number" class="java.lang.Integer">
<property name="net.sf.jasperreports.json.field.expression" value="number"/>
<fieldDescription><![CDATA[number]]></fieldDescription>
</field>
<field name="comment" class="java.lang.String">
<property name="net.sf.jasperreports.json.field.expression" value="comment"/>
<fieldDescription><![CDATA[comment]]></fieldDescription>
</field>
</subDataset>
<queryString language="JSONQL">
<![CDATA[]]>
</queryString>
<detail>
<band height="125" splitType="Stretch">
<componentElement>
<reportElement x="0" y="0" width="595" height="30" isRemoveLineWhenBlank="true" uuid="c4206620-ee0d-4e50-9336-1e1be2723c6f"/>
<jr:list xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd" printOrder="Vertical">
<datasetRun subDataset="DatasetFruitsSortAll" uuid="b9df9d8f-7ada-47eb-84e6-4870547e7bd9">
<dataSourceExpression><![CDATA[((net.sf.jasperreports.engine.data.JsonQLDataSource)$P{REPORT_DATA_SOURCE}).subDataSource("data.sorts.*")]]></dataSourceExpression>
</datasetRun>
<jr:listContents height="30" width="595">
<frame>
<reportElement style="listRow" x="0" y="0" width="590" height="30" uuid="3b3fba3d-e4c5-499c-a752-b6caa847a448"/>
<textField>
<reportElement x="0" y="0" width="100" height="30" uuid="bd3ac2b2-1803-4e0f-afa8-a0bdcc54e6fb"/>
<textFieldExpression><![CDATA[$F{fruitName}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="180" y="0" width="100" height="30" uuid="be871dcb-61a0-49bd-b565-af8aa27bc7f4"/>
<textFieldExpression><![CDATA[$F{number}]]></textFieldExpression>
</textField>
<textField isBlankWhenNull="true">
<reportElement x="400" y="0" width="190" height="30" uuid="bea6dae7-bca2-4c0a-a0b5-443a859c20ac"/>
<textFieldExpression><![CDATA[$F{comment}]]></textFieldExpression>
</textField>
</frame>
</jr:listContents>
</jr:list>
</componentElement>
</band>
</detail>
</jasperReport>
如果出于某种原因 JSONQL 或单个列表不适合您，您可以通过在嵌套列表中添加 运行 行号来为嵌套列表中的奇数行着色。为此，您需要通过参数和 return 值来回传递值 to/from 嵌套子数据集。
这就是整个报告的样子。嵌套子数据集有一个名为 subRowCount 的变量，它保留先前嵌套子数据集运行的行数。变量通过参数传递给嵌套子数据集；子数据集将其添加到当前行号并在条件样式中使用结果。然后最后的行计数 return 返回 subRowCount 变量。
<?xml version="1.0" encoding="UTF-8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="Blank_A4" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="af456afc-4615-4564-8841-81929ce2447f">
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="Adapter"/>
<style name="listRow">
<conditionalStyle>
<conditionExpression><![CDATA[$V{runningRowCount} % 2 == 0]]></conditionExpression>
<style mode="Opaque" backcolor="#FFFF00"/>
</conditionalStyle>
</style>
<subDataset name="DatasetFruits" uuid="5824cf79-a97e-4cf1-954b-cc0c327c8405">
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="Adapter"/>
<queryString language="JSON">
<![CDATA[data]]>
</queryString>
<field name="name" class="java.lang.String">
<property name="net.sf.jasperreports.json.field.expression" value="name"/>
<fieldDescription><![CDATA[name]]></fieldDescription>
</field>
<field name="sorts" class="java.lang.String">
<property name="net.sf.jasperreports.json.field.expression" value="sorts"/>
<fieldDescription><![CDATA[sorts]]></fieldDescription>
</field>
<variable name="subRowCount" class="java.lang.Integer" calculation="System">
<initialValueExpression><![CDATA[0]]></initialValueExpression>
</variable>
</subDataset>
<subDataset name="DatasetFruitsSort" uuid="5961129e-70f0-4d98-8d4e-524f2bbb28f9">
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="Adapter"/>
<parameter name="FRUIT_NAME" class="java.lang.String"/>
<parameter name="prevRowCount" class="java.lang.Integer"/>
<queryString language="JSON">
<![CDATA[data.sorts]]>
</queryString>
<field name="name" class="java.lang.String">
<property name="net.sf.jasperreports.json.field.expression" value="name"/>
<fieldDescription><![CDATA[name]]></fieldDescription>
</field>
<field name="number" class="java.lang.Integer">
<property name="net.sf.jasperreports.json.field.expression" value="number"/>
<fieldDescription><![CDATA[number]]></fieldDescription>
</field>
<field name="comment" class="java.lang.String">
<property name="net.sf.jasperreports.json.field.expression" value="comment"/>
<fieldDescription><![CDATA[comment]]></fieldDescription>
</field>
<variable name="runningRowCount" class="java.lang.Integer">
<variableExpression><![CDATA[$P{prevRowCount} + $V{REPORT_COUNT}]]></variableExpression>
</variable>
</subDataset>
<queryString language="json">
<![CDATA[]]>
</queryString>
<detail>
<band height="125" splitType="Stretch">
<componentElement>
<reportElement x="-20" y="43" width="595" height="30" uuid="da841d21-e910-4ce3-b415-1c68cade0981"/>
<jr:list xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd" printOrder="Vertical">
<datasetRun subDataset="DatasetFruits" uuid="4baf7682-130d-4b12-a973-8ab6084373de">
<dataSourceExpression><![CDATA[((net.sf.jasperreports.engine.data.JsonDataSource)$P{REPORT_DATA_SOURCE}).subDataSource("data")]]></dataSourceExpression>
</datasetRun>
<jr:listContents height="30" width="595">
<componentElement>
<reportElement x="0" y="0" width="595" height="30" isRemoveLineWhenBlank="true" uuid="c4206620-ee0d-4e50-9336-1e1be2723c6f">
<printWhenExpression><![CDATA[!$F{sorts}.equals("[]")]]></printWhenExpression>
</reportElement>
<jr:list printOrder="Vertical">
<datasetRun subDataset="DatasetFruitsSort" uuid="b9df9d8f-7ada-47eb-84e6-4870547e7bd9">
<datasetParameter name="FRUIT_NAME">
<datasetParameterExpression><![CDATA[$F{name}]]></datasetParameterExpression>
</datasetParameter>
<datasetParameter name="prevRowCount">
<datasetParameterExpression><![CDATA[$V{subRowCount}]]></datasetParameterExpression>
</datasetParameter>
<dataSourceExpression><![CDATA[((net.sf.jasperreports.engine.data.JsonDataSource)$P{REPORT_DATA_SOURCE}).subDataSource("sorts")]]></dataSourceExpression>
<returnValue fromVariable="runningRowCount" toVariable="subRowCount"/>
</datasetRun>
<jr:listContents height="30" width="595">
<frame>
<reportElement style="listRow" x="0" y="0" width="590" height="30" uuid="3b3fba3d-e4c5-499c-a752-b6caa847a448"/>
<textField>
<reportElement x="0" y="0" width="100" height="30" uuid="bd3ac2b2-1803-4e0f-afa8-a0bdcc54e6fb"/>
<textFieldExpression><![CDATA[$P{FRUIT_NAME}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="180" y="0" width="100" height="30" uuid="be871dcb-61a0-49bd-b565-af8aa27bc7f4"/>
<textFieldExpression><![CDATA[$F{number}]]></textFieldExpression>
</textField>
<textField isBlankWhenNull="true">
<reportElement x="400" y="0" width="190" height="30" uuid="bea6dae7-bca2-4c0a-a0b5-443a859c20ac"/>
<textFieldExpression><![CDATA[$F{comment}]]></textFieldExpression>
</textField>
</frame>
</jr:listContents>
</jr:list>
</componentElement>
</jr:listContents>
</jr:list>
</componentElement>
</band>
</detail>
</jasperReport>
我得到了以下json
{
"data": [
{
"name": "apple",
"sorts": [
{ "name": "green", "number": "6", "comment": "green apples are nice" },
{ "name": "yellow", "number": "1" },
{ "name": "red", "number": "2" }
]
},
{
"name": "banana",
"sorts": [
]
},
{
"name": "pear",
"sorts": [
{ "name": "green", "number": "6", "comment": "green pears are sour" },
{ "name": "purple", "number": "0", "comment": "so far we haven't seen purple pears" }
]
}
]
}
这是我想要的结果：
我用 2 个嵌套列表创建了这个并将名称传递给嵌套列表。
这很好用，但现在我想给奇数列表项上色。那就是黄苹果和绿梨。我在一个简单的列表上找到了一些关于如何执行此操作的示例，但我有一个嵌套列表，所以它不起作用。
JRXML:
<?xml version="1.0" encoding="UTF-8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="Blank_A4" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20">
<subDataset name="DatasetFruits">
<queryString language="JSON">
<![CDATA[data]]>
</queryString>
<field name="name" class="java.lang.String">
<property name="net.sf.jasperreports.json.field.expression" value="name"/>
<fieldDescription><![CDATA[name]]></fieldDescription>
</field>
<field name="sorts" class="java.lang.String">
<property name="net.sf.jasperreports.json.field.expression" value="sorts"/>
<fieldDescription><![CDATA[sorts]]></fieldDescription>
</field>
</subDataset>
<subDataset name="DatasetFruitsSort">
<parameter name="FRUIT_NAME" class="java.lang.String"/>
<queryString language="JSON">
<![CDATA[data.sorts]]>
</queryString>
<field name="name" class="java.lang.String">
<property name="net.sf.jasperreports.json.field.expression" value="name"/>
<fieldDescription><![CDATA[name]]></fieldDescription>
</field>
<field name="number" class="java.lang.Integer">
<property name="net.sf.jasperreports.json.field.expression" value="number"/>
<fieldDescription><![CDATA[number]]></fieldDescription>
</field>
<field name="comment" class="java.lang.String">
<property name="net.sf.jasperreports.json.field.expression" value="comment"/>
<fieldDescription><![CDATA[comment]]></fieldDescription>
</field>
</subDataset>
<detail>
<band height="125" splitType="Stretch">
<componentElement>
<reportElement x="-20" y="43" width="595" height="30"/>
<jr:list xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd">
<datasetRun subDataset="DatasetFruits">
<dataSourceExpression><![CDATA[((net.sf.jasperreports.engine.data.JsonDataSource)$P{REPORT_DATA_SOURCE}).subDataSource("data")]]></dataSourceExpression>
</datasetRun>
<jr:listContents height="30" width="595">
<componentElement>
<reportElement x="0" y="0" width="595" height="30" isRemoveLineWhenBlank="true">
<printWhenExpression><![CDATA[!$F{sorts}.equals("[]")]]></printWhenExpression>
</reportElement>
<jr:list>
<datasetRun subDataset="DatasetFruitsSort">
<datasetParameter name="FRUIT_NAME">
<datasetParameterExpression><![CDATA[$F{name}]]></datasetParameterExpression>
</datasetParameter>
<dataSourceExpression><![CDATA[((net.sf.jasperreports.engine.data.JsonDataSource)$P{REPORT_DATA_SOURCE}).subDataSource("sorts")]]></dataSourceExpression>
</datasetRun>
<jr:listContents height="30" width="595">
<textField>
<reportElement x="0" y="0" width="100" height="30"/>
<textFieldExpression><![CDATA[$P{FRUIT_NAME}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="180" y="0" width="100" height="30"/>
<textFieldExpression><![CDATA[$F{number}]]></textFieldExpression>
</textField>
<textField isBlankWhenNull="true">
<reportElement x="400" y="0" width="190" height="30"/>
<textFieldExpression><![CDATA[$F{comment}]]></textFieldExpression>
</textField>
</jr:listContents>
</jr:list>
</componentElement>
</jr:listContents>
</jr:list>
</componentElement>
</band>
</detail>
</jasperReport>
如果您使用的是 JasperReports 6.3.1 或更新版本，最简单的解决方案是切换到 JSONQL 并使用单个列表而不是嵌套列表。您可以阅读有关 JSONQL 数据源的信息 here.
使用 JSONQL，您可以拥有一个遍历所有 data.sorts.* 节点的列表，并通过树上的字段获取水果名称。然后使用单个列表，您可以使用简单的条件样式来为奇数行着色。
整个事情看起来像这样：
<?xml version="1.0" encoding="UTF-8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="Blank_A4" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="af456afc-4615-4564-8841-81929ce2447f">
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="Adapter"/>
<style name="listRow">
<conditionalStyle>
<conditionExpression><![CDATA[$V{REPORT_COUNT} % 2 == 0]]></conditionExpression>
<style mode="Opaque" backcolor="#FFFF00"/>
</conditionalStyle>
</style>
<subDataset name="DatasetFruitsSortAll" uuid="5961129e-70f0-4d98-8d4e-524f2bbb28f9">
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="Adapter"/>
<queryString language="JSONQL">
<![CDATA[data.sorts]]>
</queryString>
<field name="fruitName" class="java.lang.String">
<property name="net.sf.jasperreports.jsonql.field.expression" value="^^.name"/>
<fieldDescription><![CDATA[fruitName]]></fieldDescription>
</field>
<field name="name" class="java.lang.String">
<property name="net.sf.jasperreports.json.field.expression" value="name"/>
<fieldDescription><![CDATA[name]]></fieldDescription>
</field>
<field name="number" class="java.lang.Integer">
<property name="net.sf.jasperreports.json.field.expression" value="number"/>
<fieldDescription><![CDATA[number]]></fieldDescription>
</field>
<field name="comment" class="java.lang.String">
<property name="net.sf.jasperreports.json.field.expression" value="comment"/>
<fieldDescription><![CDATA[comment]]></fieldDescription>
</field>
</subDataset>
<queryString language="JSONQL">
<![CDATA[]]>
</queryString>
<detail>
<band height="125" splitType="Stretch">
<componentElement>
<reportElement x="0" y="0" width="595" height="30" isRemoveLineWhenBlank="true" uuid="c4206620-ee0d-4e50-9336-1e1be2723c6f"/>
<jr:list xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd" printOrder="Vertical">
<datasetRun subDataset="DatasetFruitsSortAll" uuid="b9df9d8f-7ada-47eb-84e6-4870547e7bd9">
<dataSourceExpression><![CDATA[((net.sf.jasperreports.engine.data.JsonQLDataSource)$P{REPORT_DATA_SOURCE}).subDataSource("data.sorts.*")]]></dataSourceExpression>
</datasetRun>
<jr:listContents height="30" width="595">
<frame>
<reportElement style="listRow" x="0" y="0" width="590" height="30" uuid="3b3fba3d-e4c5-499c-a752-b6caa847a448"/>
<textField>
<reportElement x="0" y="0" width="100" height="30" uuid="bd3ac2b2-1803-4e0f-afa8-a0bdcc54e6fb"/>
<textFieldExpression><![CDATA[$F{fruitName}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="180" y="0" width="100" height="30" uuid="be871dcb-61a0-49bd-b565-af8aa27bc7f4"/>
<textFieldExpression><![CDATA[$F{number}]]></textFieldExpression>
</textField>
<textField isBlankWhenNull="true">
<reportElement x="400" y="0" width="190" height="30" uuid="bea6dae7-bca2-4c0a-a0b5-443a859c20ac"/>
<textFieldExpression><![CDATA[$F{comment}]]></textFieldExpression>
</textField>
</frame>
</jr:listContents>
</jr:list>
</componentElement>
</band>
</detail>
</jasperReport>
如果出于某种原因 JSONQL 或单个列表不适合您，您可以通过在嵌套列表中添加 运行 行号来为嵌套列表中的奇数行着色。为此，您需要通过参数和 return 值来回传递值 to/from 嵌套子数据集。
这就是整个报告的样子。嵌套子数据集有一个名为 subRowCount 的变量，它保留先前嵌套子数据集运行的行数。变量通过参数传递给嵌套子数据集；子数据集将其添加到当前行号并在条件样式中使用结果。然后最后的行计数 return 返回 subRowCount 变量。
<?xml version="1.0" encoding="UTF-8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="Blank_A4" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="af456afc-4615-4564-8841-81929ce2447f">
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="Adapter"/>
<style name="listRow">
<conditionalStyle>
<conditionExpression><![CDATA[$V{runningRowCount} % 2 == 0]]></conditionExpression>
<style mode="Opaque" backcolor="#FFFF00"/>
</conditionalStyle>
</style>
<subDataset name="DatasetFruits" uuid="5824cf79-a97e-4cf1-954b-cc0c327c8405">
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="Adapter"/>
<queryString language="JSON">
<![CDATA[data]]>
</queryString>
<field name="name" class="java.lang.String">
<property name="net.sf.jasperreports.json.field.expression" value="name"/>
<fieldDescription><![CDATA[name]]></fieldDescription>
</field>
<field name="sorts" class="java.lang.String">
<property name="net.sf.jasperreports.json.field.expression" value="sorts"/>
<fieldDescription><![CDATA[sorts]]></fieldDescription>
</field>
<variable name="subRowCount" class="java.lang.Integer" calculation="System">
<initialValueExpression><![CDATA[0]]></initialValueExpression>
</variable>
</subDataset>
<subDataset name="DatasetFruitsSort" uuid="5961129e-70f0-4d98-8d4e-524f2bbb28f9">
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="Adapter"/>
<parameter name="FRUIT_NAME" class="java.lang.String"/>
<parameter name="prevRowCount" class="java.lang.Integer"/>
<queryString language="JSON">
<![CDATA[data.sorts]]>
</queryString>
<field name="name" class="java.lang.String">
<property name="net.sf.jasperreports.json.field.expression" value="name"/>
<fieldDescription><![CDATA[name]]></fieldDescription>
</field>
<field name="number" class="java.lang.Integer">
<property name="net.sf.jasperreports.json.field.expression" value="number"/>
<fieldDescription><![CDATA[number]]></fieldDescription>
</field>
<field name="comment" class="java.lang.String">
<property name="net.sf.jasperreports.json.field.expression" value="comment"/>
<fieldDescription><![CDATA[comment]]></fieldDescription>
</field>
<variable name="runningRowCount" class="java.lang.Integer">
<variableExpression><![CDATA[$P{prevRowCount} + $V{REPORT_COUNT}]]></variableExpression>
</variable>
</subDataset>
<queryString language="json">
<![CDATA[]]>
</queryString>
<detail>
<band height="125" splitType="Stretch">
<componentElement>
<reportElement x="-20" y="43" width="595" height="30" uuid="da841d21-e910-4ce3-b415-1c68cade0981"/>
<jr:list xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd" printOrder="Vertical">
<datasetRun subDataset="DatasetFruits" uuid="4baf7682-130d-4b12-a973-8ab6084373de">
<dataSourceExpression><![CDATA[((net.sf.jasperreports.engine.data.JsonDataSource)$P{REPORT_DATA_SOURCE}).subDataSource("data")]]></dataSourceExpression>
</datasetRun>
<jr:listContents height="30" width="595">
<componentElement>
<reportElement x="0" y="0" width="595" height="30" isRemoveLineWhenBlank="true" uuid="c4206620-ee0d-4e50-9336-1e1be2723c6f">
<printWhenExpression><![CDATA[!$F{sorts}.equals("[]")]]></printWhenExpression>
</reportElement>
<jr:list printOrder="Vertical">
<datasetRun subDataset="DatasetFruitsSort" uuid="b9df9d8f-7ada-47eb-84e6-4870547e7bd9">
<datasetParameter name="FRUIT_NAME">
<datasetParameterExpression><![CDATA[$F{name}]]></datasetParameterExpression>
</datasetParameter>
<datasetParameter name="prevRowCount">
<datasetParameterExpression><![CDATA[$V{subRowCount}]]></datasetParameterExpression>
</datasetParameter>
<dataSourceExpression><![CDATA[((net.sf.jasperreports.engine.data.JsonDataSource)$P{REPORT_DATA_SOURCE}).subDataSource("sorts")]]></dataSourceExpression>
<returnValue fromVariable="runningRowCount" toVariable="subRowCount"/>
</datasetRun>
<jr:listContents height="30" width="595">
<frame>
<reportElement style="listRow" x="0" y="0" width="590" height="30" uuid="3b3fba3d-e4c5-499c-a752-b6caa847a448"/>
<textField>
<reportElement x="0" y="0" width="100" height="30" uuid="bd3ac2b2-1803-4e0f-afa8-a0bdcc54e6fb"/>
<textFieldExpression><![CDATA[$P{FRUIT_NAME}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="180" y="0" width="100" height="30" uuid="be871dcb-61a0-49bd-b565-af8aa27bc7f4"/>
<textFieldExpression><![CDATA[$F{number}]]></textFieldExpression>
</textField>
<textField isBlankWhenNull="true">
<reportElement x="400" y="0" width="190" height="30" uuid="bea6dae7-bca2-4c0a-a0b5-443a859c20ac"/>
<textFieldExpression><![CDATA[$F{comment}]]></textFieldExpression>
</textField>
</frame>
</jr:listContents>
</jr:list>
</componentElement>
</jr:listContents>
</jr:list>
</componentElement>
</band>
</detail>
</jasperReport>