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我想用JasperReports创建一个xls报表。 为此我使用JasperReports 5.5.0（和iReport在同一版本）和apache poi 3.9。JasperReports子报表Streching
基本结构是带有子报表的主报表，此子报表还包含另一个子报表。为了更好地理解一些代码示例：
Masterreport：
<?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="report1" language="groovy" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="ada06392-98fc-4512-99d3-a4008c86ed40">
<property name="net.sf.jasperreports.export.xls.remove.empty.space.between.rows" value="true"/>
<property name="net.sf.jasperreports.export.xls.remove.empty.space.between.columns" value="true"/>
<property name="net.sf.jasperreports.export.xls.create.custom.palette" value="true"/>
<property name="net.sf.jasperreports.style.evaluation.time.enabled" value="true"/>
<property name="net.sf.jasperreports.export.xls.wrap.text" value="true"/>
<property name="net.sf.jasperreports.print.keep.full.text" value="true"/>
<property name="ireport.zoom" value="3.1384283767210035"/>
<property name="ireport.x" value="34"/>
<property name="ireport.y" value="0"/>
<parameter name="subreportDisLayer" class="net.sf.jasperreports.engine.JasperReport" isForPrompting="false"/>
<field name="nextLayerList" class="java.util.List"/>
<field name="field1" class="java.lang.String"/>
<field name="field2" class="java.lang.String"/>
<background>
<band splitType="Stretch"/>
</background>
<columnHeader>
<band height="42" splitType="Stretch"/>
</columnHeader>
<detail>
<band height="13" splitType="Stretch">
<subreport isUsingCache="true" runToBottom="true">
<reportElement x="0" y="0" width="555" height="13" isPrintWhenDetailOverflows="true" uuid="222f19ef-c9f7-40a9-ae44-11ef6e15f1ad"/>
<subreportParameter name="subsubreportLayer">
<subreportParameterExpression><![CDATA[$P{subsubreportLayer}]]></subreportParameterExpression>
</subreportParameter>
<dataSourceExpression><![CDATA[new JRBeanCollectionDataSource($F{nextLayerList})]]></dataSourceExpression>
<subreportExpression><![CDATA[$P{subreportLayer}]]></subreportExpression>
</subreport>
<textField isStretchWithOverflow="true" isBlankWhenNull="true">
<reportElement stretchType="RelativeToTallestObject" mode="Opaque" x="40" y="0" width="30" height="13" isPrintWhenDetailOverflows="true" uuid="ab260763-72ff-47ff-ad53-dfedde447908"/>
<box>
<topPen lineWidth="0.5" lineColor="#000000"/>
<leftPen lineWidth="0.5" lineColor="#000000"/>
<bottomPen lineWidth="0.5" lineColor="#000000"/>
<rightPen lineWidth="0.5" lineColor="#000000"/>
</box>
<textElement>
<font size="8"/>
<paragraph leftIndent="2" tabStopWidth="4"/>
</textElement>
<textFieldExpression><![CDATA[$F{field1}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true" isBlankWhenNull="true">
<reportElement stretchType="RelativeToTallestObject" mode="Opaque" x="70" y="0" width="50" height="13" isPrintWhenDetailOverflows="true" uuid="c408ac05-ee11-4e49-9609-179429b76e20"/>
<box>
<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>
<textElement>
<font size="8"/>
<paragraph leftIndent="2" tabStopWidth="4"/>
</textElement>
<textFieldExpression><![CDATA[$F{field2}]]></textFieldExpression>
</textField>
</band>
</detail>
子报表1：
<?xml version="1.0" encoding="UTF-8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="report1" language="groovy" pageWidth="595" pageHeight="842" columnWidth="595" leftMargin="0" rightMargin="0" topMargin="0" bottomMargin="0" uuid="ada06392-98fc-4512-99d3-a4008c86ed40">
<property name="net.sf.jasperreports.export.xls.remove.empty.space.between.rows" value="true"/>
<property name="net.sf.jasperreports.export.xls.remove.empty.space.between.columns" value="true"/>
<property name="net.sf.jasperreports.export.xls.create.custom.palette" value="true"/>
<property name="net.sf.jasperreports.style.evaluation.time.enabled" value="true"/>
<property name="net.sf.jasperreports.export.xls.wrap.text" value="true"/>
<property name="net.sf.jasperreports.print.keep.full.text" value="true"/>
<property name="ireport.zoom" value="3.1384283767210035"/>
<property name="ireport.x" value="34"/>
<property name="ireport.y" value="0"/>
<parameter name="subsubreportLayer" class="net.sf.jasperreports.engine.JasperReport" isForPrompting="false"/>
<field name="nextLayerList" class="java.util.List"/>
<field name="field3" class="java.lang.String"/>
<background>
<band splitType="Stretch"/>
</background>
<detail>
<band height="13" splitType="Stretch">
<subreport isUsingCache="true" >
<reportElement x="0" y="0" width="555" height="13" isPrintWhenDetailOverflows="true" uuid="222f19ef-c9f7-40a9-ae44-11ef6e15f1ad"/>
<dataSourceExpression><![CDATA[new JRBeanCollectionDataSource($F{nextLayerList})]]></dataSourceExpression>
<subreportExpression><![CDATA[$P{subsubreportLayer}]]></subreportExpression>
</subreport>
<textField isStretchWithOverflow="true" isBlankWhenNull="true">
<reportElement stretchType="RelativeToBandHeight" mode="Opaque" x="274" y="0" width="100" height="13" isPrintWhenDetailOverflows="true" uuid="7fae7678-55c7-4308-9977-f71e215b38c9"/>
<box>
<topPen lineWidth="0.5" lineColor="#000000"/>
<leftPen lineWidth="0.5" lineColor="#000000"/>
<bottomPen lineWidth="0.5" lineColor="#000000"/>
<rightPen lineWidth="0.5" lineColor="#000000"/>
</box>
<textElement>
<font size="8"/>
<paragraph leftIndent="2" tabStopWidth="4"/>
</textElement>
<textFieldExpression><![CDATA[$F{field3}]]></textFieldExpression>
</textField>
</band>
</detail>
第二报表看起来几乎同样喜欢第一个。
我的问题是，如果主人的行高度大于子报表的整个乐队高度，则子报表不会将其乐队高度伸展到主人行高度。 我知道它只是一个简单的设置组合，但我找不到它。 感谢您的帮助！
奥利弗