如何在多个子报表上使用相同的 JRBeanCollectionDataSource？
How to use same JRBeanCollectionDataSource on multiple sub reports?
我调用了两个具有相同数据源的子报表，但是当我打印此报表时，只有第一个子报表填充了 table。
这就是我通过 statsData1 进行报告的方式。
List<BasicStats> summaryList = new ArrayList<>();
summaryList.add(new BasicStats("A", 5d, 6.5d, 25d));
summaryList.add(new BasicStats("B", 1.47d, 2.7d, 72d));
summaryList.add(new BasicStats("c", .39d, 9.5d, 91d));
summaryList.add(new BasicStats("D", 8.2d, 1.3d, 37d));
summaryList.add(new BasicStats("E", 6.8d, 4.5d, 19d));
Map<String, Object> paramsMap = new HashMap<>();
JRBeanCollectionDataSource jbcdSummary = new JRBeanCollectionDataSource(summaryList);
paramsMap.put("statsData1", jbcdSummary);
不过，我注意到如果我像下面这样传递 2 个不同的对象，它会起作用（对下面的 jrxml 进行相关修改）我得到两个子报告 tables。
paramsMap.put("statsData1", new JRBeanCollectionDataSource(summaryList));
paramsMap.put("statsData2", new JRBeanCollectionDataSource(summaryList));
这和JRBeanCollectionDataSource是消耗品什么的有关系吗？
这是我的主要jrxml
<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.6.0.final using JasperReports Library version 6.6.0 -->
<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="main" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="0" rightMargin="0" topMargin="0" bottomMargin="0" uuid="6a63a79b-6f04-46c7-b3b9-a067e835ea4d">
<parameter name="subRptTitle" class="java.lang.String"/>
<parameter name="statsData1" class="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource"/>
<background>
<band splitType="Stretch"/>
</background>
<title>
<band height="79" splitType="Stretch">
<textField>
<reportElement x="250" y="20" width="100" height="30" uuid="42f86896-5b37-4ee3-8f0c-29bf90eb3846"/>
<textFieldExpression><![CDATA[$P{subRptTitle}]]></textFieldExpression>
</textField>
</band>
</title>
<summary>
<band height="203" splitType="Stretch">
<subreport>
<reportElement x="10" y="31" width="281" height="161" uuid="73d60b1f-1b66-44b1-a8a5-d9738067aaf1"/>
<subreportParameter name="statsData">
<subreportParameterExpression><![CDATA[$P{statsData1}]]></subreportParameterExpression>
</subreportParameter>
<dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.JREmptyDataSource()]]></dataSourceExpression>
<subreportExpression><![CDATA["sub-table.jasper"]]></subreportExpression>
</subreport>
<subreport>
<reportElement x="310" y="31" width="273" height="161" uuid="686bb10d-7018-4cf1-b72b-c17e534ec5e0"/>
<subreportParameter name="statsData">
<subreportParameterExpression><![CDATA[$P{statsData1}]]></subreportParameterExpression>
</subreportParameter>
<dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.JREmptyDataSource()]]></dataSourceExpression>
<subreportExpression><![CDATA["sub-table.jasper"]]></subreportExpression>
</subreport>
</band>
</summary>
</jasperReport>
这是我的子报告，sub-table.jrxml
<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.6.0.final using JasperReports Library version 6.6.0 -->
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="main" pageWidth="200" pageHeight="842" columnWidth="200" leftMargin="0" rightMargin="0" topMargin="0" bottomMargin="0" uuid="6a63a79b-6f04-46c7-b3b9-a067e835ea4d">
<style name="Table_TH" mode="Opaque" backcolor="#F0F8FF">
<box>
<pen lineWidth="0.5" lineColor="#000000"/>
<topPen lineWidth="0.5" lineColor="#000000"/>
<leftPen lineWidth="0.5" lineColor="#000000"/>
<bottomPen lineWidth="0.5" lineColor="#000000"/>
<rightPen lineWidth="0.5" lineColor="#000000"/>
</box>
</style>
<style name="Table_CH" mode="Opaque" backcolor="#BFE1FF">
<box>
<pen lineWidth="0.5" lineColor="#000000"/>
<topPen lineWidth="0.5" lineColor="#000000"/>
<leftPen lineWidth="0.5" lineColor="#000000"/>
<bottomPen lineWidth="0.5" lineColor="#000000"/>
<rightPen lineWidth="0.5" lineColor="#000000"/>
</box>
</style>
<style name="Table_TD" mode="Opaque" backcolor="#FFFFFF">
<box>
<pen lineWidth="0.5" lineColor="#000000"/>
<topPen lineWidth="0.5" lineColor="#000000"/>
<leftPen lineWidth="0.5" lineColor="#000000"/>
<bottomPen lineWidth="0.5" lineColor="#000000"/>
<rightPen lineWidth="0.5" lineColor="#000000"/>
</box>
<conditionalStyle>
<conditionExpression><![CDATA[new Boolean($V{REPORT_COUNT}.intValue()%2==0)]]></conditionExpression>
<style backcolor="#FBFDFF"/>
</conditionalStyle>
</style>
<subDataset name="tableDataSet" uuid="2914f7c6-c2d7-448b-b0c1-090970e18ed6">
<field name="subEntity" class="java.lang.String"/>
<field name="total" class="java.lang.Double"/>
<field name="pending" class="java.lang.Double"/>
<field name="percentage" class="java.lang.Double"/>
<variable name="vTotalSum" class="java.lang.Double" calculation="Sum">
<variableExpression><![CDATA[$F{total}]]></variableExpression>
</variable>
<variable name="vPendingSum" class="java.lang.Double" calculation="Sum">
<variableExpression><![CDATA[$F{pending}]]></variableExpression>
</variable>
<variable name="vPercentageSum" class="java.lang.Double" calculation="Sum">
<variableExpression><![CDATA[$F{percentage}]]></variableExpression>
</variable>
</subDataset>
<parameter name="subRptTitle" class="java.lang.String"/>
<parameter name="statsData" class="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource"/>
<background>
<band splitType="Stretch"/>
</background>
<title>
<band height="79" splitType="Stretch">
<textField>
<reportElement x="50" y="30" width="100" height="30" uuid="42f86896-5b37-4ee3-8f0c-29bf90eb3846"/>
<textFieldExpression><![CDATA[$P{subRptTitle}]]></textFieldExpression>
</textField>
</band>
</title>
<summary>
<band height="203" splitType="Stretch">
<componentElement>
<reportElement x="9" y="11" width="182" height="181" uuid="7451c7aa-8532-471e-ad02-eb98ca21d171">
<property name="com.jaspersoft.studio.layout" value="com.jaspersoft.studio.editor.layout.VerticalRowLayout"/>
<property name="com.jaspersoft.studio.table.style.table_header" value="Table_TH"/>
<property name="com.jaspersoft.studio.table.style.column_header" value="Table_CH"/>
<property name="com.jaspersoft.studio.table.style.detail" value="Table_TD"/>
</reportElement>
<jr:table 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="tableDataSet" uuid="eecbe24c-593f-42fa-a7ab-2fbe8b59cb34">
<dataSourceExpression><![CDATA[$P{statsData}]]></dataSourceExpression>
</datasetRun>
<jr:column width="45" uuid="6ea97833-5ba6-48f1-9096-66bb2d6d5978">
<jr:tableHeader style="Table_TH" height="30"/>
<jr:tableFooter style="Table_TH" height="30"/>
<jr:columnHeader style="Table_CH" height="30">
<staticText>
<reportElement x="0" y="0" width="45" height="30" uuid="afce87c3-7a33-4b79-9627-2c2f37d78609"/>
<text><![CDATA[subEntity]]></text>
</staticText>
</jr:columnHeader>
<jr:columnFooter style="Table_CH" height="30"/>
<jr:detailCell style="Table_TD" height="30">
<textField>
<reportElement x="0" y="0" width="45" height="30" uuid="f312e4dc-bd65-4cf6-8c2c-27c1d88940b9"/>
<textFieldExpression><![CDATA[$F{subEntity}]]></textFieldExpression>
</textField>
</jr:detailCell>
</jr:column>
<jr:column width="45" uuid="89672e7b-ee57-4a0d-8f6e-885c189a9c1d">
<jr:tableHeader style="Table_TH" height="30"/>
<jr:tableFooter style="Table_TH" height="30">
<textField>
<reportElement x="0" y="0" width="45" height="30" uuid="c8ef39c5-ea48-41e4-a069-9d07e1ce301b"/>
<textFieldExpression><![CDATA[$V{vTotalSum}]]></textFieldExpression>
</textField>
</jr:tableFooter>
<jr:columnHeader style="Table_CH" height="30">
<staticText>
<reportElement x="0" y="0" width="45" height="30" uuid="c57bbc8c-b840-45fd-b21a-3b7121c29f71"/>
<text><![CDATA[total]]></text>
</staticText>
</jr:columnHeader>
<jr:columnFooter style="Table_CH" height="30"/>
<jr:detailCell style="Table_TD" height="30">
<textField>
<reportElement x="0" y="0" width="45" height="30" uuid="bf1068c6-42f2-4cb4-b1f0-8b195d362247"/>
<textFieldExpression><![CDATA[$F{total}]]></textFieldExpression>
</textField>
</jr:detailCell>
</jr:column>
<jr:column width="45" uuid="4b3eea40-3cca-48a8-961f-6fbe9edfb973">
<jr:tableHeader style="Table_TH" height="30"/>
<jr:tableFooter style="Table_TH" height="30">
<textField>
<reportElement x="0" y="0" width="45" height="30" uuid="f4787fdd-5f5b-4f03-97e7-05e4c2c34f0f"/>
<textFieldExpression><![CDATA[$V{vPendingSum}]]></textFieldExpression>
</textField>
</jr:tableFooter>
<jr:columnHeader style="Table_CH" height="30">
<staticText>
<reportElement x="0" y="0" width="45" height="30" uuid="5aa2afde-3b32-480e-b115-9ffddf95ab64"/>
<text><![CDATA[pending]]></text>
</staticText>
</jr:columnHeader>
<jr:columnFooter style="Table_CH" height="30"/>
<jr:detailCell style="Table_TD" height="30">
<textField>
<reportElement x="0" y="0" width="45" height="30" uuid="89a528bc-2e09-467f-b709-7434bc6732da"/>
<textFieldExpression><![CDATA[$F{pending}]]></textFieldExpression>
</textField>
</jr:detailCell>
</jr:column>
<jr:column width="45" uuid="a7c26c8f-361f-4d33-820a-abd2cb3268ad">
<jr:tableHeader style="Table_TH" height="30"/>
<jr:tableFooter style="Table_TH" height="30">
<textField>
<reportElement x="0" y="0" width="45" height="30" uuid="7e1115c0-35fb-48d2-b0bd-b36e5a782d67"/>
<textFieldExpression><![CDATA[$V{vPercentageSum}]]></textFieldExpression>
</textField>
</jr:tableFooter>
<jr:columnHeader style="Table_CH" height="30">
<staticText>
<reportElement x="0" y="0" width="45" height="30" uuid="20743d33-811c-411a-b7d1-c78e57ccd018"/>
<text><![CDATA[percentage]]></text>
</staticText>
</jr:columnHeader>
<jr:columnFooter style="Table_CH" height="30"/>
<jr:detailCell style="Table_TD" height="30">
<textField>
<reportElement x="0" y="0" width="45" height="30" uuid="ebeb9419-af5d-4475-a8f7-ab13ab4a7b9f"/>
<textFieldExpression><![CDATA[$F{percentage}]]></textFieldExpression>
</textField>
</jr:detailCell>
</jr:column>
</jr:table>
</componentElement>
</band>
</summary>
</jasperReport>
更改 sub-table.jrxml 以使其使用 2 个参数
<parameter name="statsData1" class="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource"/>
<parameter name="statsData2" class="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource"/>
<subreport>
<reportElement x="310" y="31" width="273" height="161" uuid="686bb10d-7018-4cf1-b72b-c17e534ec5e0"/>
<subreportParameter name="statsData">
<subreportParameterExpression><![CDATA[$P{statsData2}]]></subreportParameterExpression>
</subreportParameter>
<dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.JREmptyDataSource()]]></dataSourceExpression>
<subreportExpression><![CDATA["sub-table.jasper"]]></subreportExpression>
</subreport>
对此有什么更好的解决方法？
JRBeanCollectionDataSource as you can see in api implements both JRDataSource and JRRewindableDataSource.
JRDataSource 是一个可使用的数据源（只有 next() 方法），但是 JRRewindableDataSource 添加了一个 moveFirst() 方法，可以倒回数据源。
但是，这在 jrxml 文件（设计文件）中并不简单，我不建议这样做。
在您的情况下，最简单的解决方案是不传递 JRBeanCollectionDataSource，而是传递 List（您的 summaryList），并在您的 jrxml 中创建 JRBeanCollectionDataSource 作为多次即可。
例子
在java
paramsMap.put("statsData", summaryList);
在jrxml中
<parameter name="statsData" class="java.util.List"/>
...
<subreportParameter name="statsData">
<subreportParameterExpression><![CDATA[new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($P{statsData})]]></subreportParameterExpression>
</subreportParameter>
...
Note for future readers: This subreport is particular it passes a datasource as a parameter (that will be used to populate a jr:table in the subreport), normally you would pass the datasource in the <dataSourceExpression>
我调用了两个具有相同数据源的子报表，但是当我打印此报表时，只有第一个子报表填充了 table。
这就是我通过 statsData1 进行报告的方式。
List<BasicStats> summaryList = new ArrayList<>();
summaryList.add(new BasicStats("A", 5d, 6.5d, 25d));
summaryList.add(new BasicStats("B", 1.47d, 2.7d, 72d));
summaryList.add(new BasicStats("c", .39d, 9.5d, 91d));
summaryList.add(new BasicStats("D", 8.2d, 1.3d, 37d));
summaryList.add(new BasicStats("E", 6.8d, 4.5d, 19d));
Map<String, Object> paramsMap = new HashMap<>();
JRBeanCollectionDataSource jbcdSummary = new JRBeanCollectionDataSource(summaryList);
paramsMap.put("statsData1", jbcdSummary);
不过，我注意到如果我像下面这样传递 2 个不同的对象，它会起作用（对下面的 jrxml 进行相关修改）我得到两个子报告 tables。
paramsMap.put("statsData1", new JRBeanCollectionDataSource(summaryList));
paramsMap.put("statsData2", new JRBeanCollectionDataSource(summaryList));
这和JRBeanCollectionDataSource是消耗品什么的有关系吗？
这是我的主要jrxml
<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.6.0.final using JasperReports Library version 6.6.0 -->
<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="main" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="0" rightMargin="0" topMargin="0" bottomMargin="0" uuid="6a63a79b-6f04-46c7-b3b9-a067e835ea4d">
<parameter name="subRptTitle" class="java.lang.String"/>
<parameter name="statsData1" class="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource"/>
<background>
<band splitType="Stretch"/>
</background>
<title>
<band height="79" splitType="Stretch">
<textField>
<reportElement x="250" y="20" width="100" height="30" uuid="42f86896-5b37-4ee3-8f0c-29bf90eb3846"/>
<textFieldExpression><![CDATA[$P{subRptTitle}]]></textFieldExpression>
</textField>
</band>
</title>
<summary>
<band height="203" splitType="Stretch">
<subreport>
<reportElement x="10" y="31" width="281" height="161" uuid="73d60b1f-1b66-44b1-a8a5-d9738067aaf1"/>
<subreportParameter name="statsData">
<subreportParameterExpression><![CDATA[$P{statsData1}]]></subreportParameterExpression>
</subreportParameter>
<dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.JREmptyDataSource()]]></dataSourceExpression>
<subreportExpression><![CDATA["sub-table.jasper"]]></subreportExpression>
</subreport>
<subreport>
<reportElement x="310" y="31" width="273" height="161" uuid="686bb10d-7018-4cf1-b72b-c17e534ec5e0"/>
<subreportParameter name="statsData">
<subreportParameterExpression><![CDATA[$P{statsData1}]]></subreportParameterExpression>
</subreportParameter>
<dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.JREmptyDataSource()]]></dataSourceExpression>
<subreportExpression><![CDATA["sub-table.jasper"]]></subreportExpression>
</subreport>
</band>
</summary>
</jasperReport>
这是我的子报告，sub-table.jrxml
<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.6.0.final using JasperReports Library version 6.6.0 -->
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="main" pageWidth="200" pageHeight="842" columnWidth="200" leftMargin="0" rightMargin="0" topMargin="0" bottomMargin="0" uuid="6a63a79b-6f04-46c7-b3b9-a067e835ea4d">
<style name="Table_TH" mode="Opaque" backcolor="#F0F8FF">
<box>
<pen lineWidth="0.5" lineColor="#000000"/>
<topPen lineWidth="0.5" lineColor="#000000"/>
<leftPen lineWidth="0.5" lineColor="#000000"/>
<bottomPen lineWidth="0.5" lineColor="#000000"/>
<rightPen lineWidth="0.5" lineColor="#000000"/>
</box>
</style>
<style name="Table_CH" mode="Opaque" backcolor="#BFE1FF">
<box>
<pen lineWidth="0.5" lineColor="#000000"/>
<topPen lineWidth="0.5" lineColor="#000000"/>
<leftPen lineWidth="0.5" lineColor="#000000"/>
<bottomPen lineWidth="0.5" lineColor="#000000"/>
<rightPen lineWidth="0.5" lineColor="#000000"/>
</box>
</style>
<style name="Table_TD" mode="Opaque" backcolor="#FFFFFF">
<box>
<pen lineWidth="0.5" lineColor="#000000"/>
<topPen lineWidth="0.5" lineColor="#000000"/>
<leftPen lineWidth="0.5" lineColor="#000000"/>
<bottomPen lineWidth="0.5" lineColor="#000000"/>
<rightPen lineWidth="0.5" lineColor="#000000"/>
</box>
<conditionalStyle>
<conditionExpression><![CDATA[new Boolean($V{REPORT_COUNT}.intValue()%2==0)]]></conditionExpression>
<style backcolor="#FBFDFF"/>
</conditionalStyle>
</style>
<subDataset name="tableDataSet" uuid="2914f7c6-c2d7-448b-b0c1-090970e18ed6">
<field name="subEntity" class="java.lang.String"/>
<field name="total" class="java.lang.Double"/>
<field name="pending" class="java.lang.Double"/>
<field name="percentage" class="java.lang.Double"/>
<variable name="vTotalSum" class="java.lang.Double" calculation="Sum">
<variableExpression><![CDATA[$F{total}]]></variableExpression>
</variable>
<variable name="vPendingSum" class="java.lang.Double" calculation="Sum">
<variableExpression><![CDATA[$F{pending}]]></variableExpression>
</variable>
<variable name="vPercentageSum" class="java.lang.Double" calculation="Sum">
<variableExpression><![CDATA[$F{percentage}]]></variableExpression>
</variable>
</subDataset>
<parameter name="subRptTitle" class="java.lang.String"/>
<parameter name="statsData" class="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource"/>
<background>
<band splitType="Stretch"/>
</background>
<title>
<band height="79" splitType="Stretch">
<textField>
<reportElement x="50" y="30" width="100" height="30" uuid="42f86896-5b37-4ee3-8f0c-29bf90eb3846"/>
<textFieldExpression><![CDATA[$P{subRptTitle}]]></textFieldExpression>
</textField>
</band>
</title>
<summary>
<band height="203" splitType="Stretch">
<componentElement>
<reportElement x="9" y="11" width="182" height="181" uuid="7451c7aa-8532-471e-ad02-eb98ca21d171">
<property name="com.jaspersoft.studio.layout" value="com.jaspersoft.studio.editor.layout.VerticalRowLayout"/>
<property name="com.jaspersoft.studio.table.style.table_header" value="Table_TH"/>
<property name="com.jaspersoft.studio.table.style.column_header" value="Table_CH"/>
<property name="com.jaspersoft.studio.table.style.detail" value="Table_TD"/>
</reportElement>
<jr:table 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="tableDataSet" uuid="eecbe24c-593f-42fa-a7ab-2fbe8b59cb34">
<dataSourceExpression><![CDATA[$P{statsData}]]></dataSourceExpression>
</datasetRun>
<jr:column width="45" uuid="6ea97833-5ba6-48f1-9096-66bb2d6d5978">
<jr:tableHeader style="Table_TH" height="30"/>
<jr:tableFooter style="Table_TH" height="30"/>
<jr:columnHeader style="Table_CH" height="30">
<staticText>
<reportElement x="0" y="0" width="45" height="30" uuid="afce87c3-7a33-4b79-9627-2c2f37d78609"/>
<text><![CDATA[subEntity]]></text>
</staticText>
</jr:columnHeader>
<jr:columnFooter style="Table_CH" height="30"/>
<jr:detailCell style="Table_TD" height="30">
<textField>
<reportElement x="0" y="0" width="45" height="30" uuid="f312e4dc-bd65-4cf6-8c2c-27c1d88940b9"/>
<textFieldExpression><![CDATA[$F{subEntity}]]></textFieldExpression>
</textField>
</jr:detailCell>
</jr:column>
<jr:column width="45" uuid="89672e7b-ee57-4a0d-8f6e-885c189a9c1d">
<jr:tableHeader style="Table_TH" height="30"/>
<jr:tableFooter style="Table_TH" height="30">
<textField>
<reportElement x="0" y="0" width="45" height="30" uuid="c8ef39c5-ea48-41e4-a069-9d07e1ce301b"/>
<textFieldExpression><![CDATA[$V{vTotalSum}]]></textFieldExpression>
</textField>
</jr:tableFooter>
<jr:columnHeader style="Table_CH" height="30">
<staticText>
<reportElement x="0" y="0" width="45" height="30" uuid="c57bbc8c-b840-45fd-b21a-3b7121c29f71"/>
<text><![CDATA[total]]></text>
</staticText>
</jr:columnHeader>
<jr:columnFooter style="Table_CH" height="30"/>
<jr:detailCell style="Table_TD" height="30">
<textField>
<reportElement x="0" y="0" width="45" height="30" uuid="bf1068c6-42f2-4cb4-b1f0-8b195d362247"/>
<textFieldExpression><![CDATA[$F{total}]]></textFieldExpression>
</textField>
</jr:detailCell>
</jr:column>
<jr:column width="45" uuid="4b3eea40-3cca-48a8-961f-6fbe9edfb973">
<jr:tableHeader style="Table_TH" height="30"/>
<jr:tableFooter style="Table_TH" height="30">
<textField>
<reportElement x="0" y="0" width="45" height="30" uuid="f4787fdd-5f5b-4f03-97e7-05e4c2c34f0f"/>
<textFieldExpression><![CDATA[$V{vPendingSum}]]></textFieldExpression>
</textField>
</jr:tableFooter>
<jr:columnHeader style="Table_CH" height="30">
<staticText>
<reportElement x="0" y="0" width="45" height="30" uuid="5aa2afde-3b32-480e-b115-9ffddf95ab64"/>
<text><![CDATA[pending]]></text>
</staticText>
</jr:columnHeader>
<jr:columnFooter style="Table_CH" height="30"/>
<jr:detailCell style="Table_TD" height="30">
<textField>
<reportElement x="0" y="0" width="45" height="30" uuid="89a528bc-2e09-467f-b709-7434bc6732da"/>
<textFieldExpression><![CDATA[$F{pending}]]></textFieldExpression>
</textField>
</jr:detailCell>
</jr:column>
<jr:column width="45" uuid="a7c26c8f-361f-4d33-820a-abd2cb3268ad">
<jr:tableHeader style="Table_TH" height="30"/>
<jr:tableFooter style="Table_TH" height="30">
<textField>
<reportElement x="0" y="0" width="45" height="30" uuid="7e1115c0-35fb-48d2-b0bd-b36e5a782d67"/>
<textFieldExpression><![CDATA[$V{vPercentageSum}]]></textFieldExpression>
</textField>
</jr:tableFooter>
<jr:columnHeader style="Table_CH" height="30">
<staticText>
<reportElement x="0" y="0" width="45" height="30" uuid="20743d33-811c-411a-b7d1-c78e57ccd018"/>
<text><![CDATA[percentage]]></text>
</staticText>
</jr:columnHeader>
<jr:columnFooter style="Table_CH" height="30"/>
<jr:detailCell style="Table_TD" height="30">
<textField>
<reportElement x="0" y="0" width="45" height="30" uuid="ebeb9419-af5d-4475-a8f7-ab13ab4a7b9f"/>
<textFieldExpression><![CDATA[$F{percentage}]]></textFieldExpression>
</textField>
</jr:detailCell>
</jr:column>
</jr:table>
</componentElement>
</band>
</summary>
</jasperReport>
更改 sub-table.jrxml 以使其使用 2 个参数
<parameter name="statsData1" class="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource"/>
<parameter name="statsData2" class="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource"/>
<subreport>
<reportElement x="310" y="31" width="273" height="161" uuid="686bb10d-7018-4cf1-b72b-c17e534ec5e0"/>
<subreportParameter name="statsData">
<subreportParameterExpression><![CDATA[$P{statsData2}]]></subreportParameterExpression>
</subreportParameter>
<dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.JREmptyDataSource()]]></dataSourceExpression>
<subreportExpression><![CDATA["sub-table.jasper"]]></subreportExpression>
</subreport>
对此有什么更好的解决方法？
JRBeanCollectionDataSource as you can see in api implements both JRDataSource and JRRewindableDataSource.
JRDataSource 是一个可使用的数据源（只有 next() 方法），但是 JRRewindableDataSource 添加了一个 moveFirst() 方法，可以倒回数据源。
但是，这在 jrxml 文件（设计文件）中并不简单，我不建议这样做。
在您的情况下，最简单的解决方案是不传递 JRBeanCollectionDataSource，而是传递 List（您的 summaryList），并在您的 jrxml 中创建 JRBeanCollectionDataSource 作为多次即可。
例子
在java
paramsMap.put("statsData", summaryList);
在jrxml中
<parameter name="statsData" class="java.util.List"/>
...
<subreportParameter name="statsData">
<subreportParameterExpression><![CDATA[new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($P{statsData})]]></subreportParameterExpression>
</subreportParameter>
...
Note for future readers: This subreport is particular it passes a datasource as a parameter (that will be used to populate a
jr:tablein the subreport), normally you would pass the datasource in the<dataSourceExpression>