【发布时间】：2016-05-25 14:41:20
【问题描述】：
我想使用 jasperreport 生成带有表格的 pdf 文件，我的 java 代码如下：
JasperReport report = JasperCompileManager.compileReport("src/main/resources/report1.jrxml");
Map<String,Object> params = new HashMap<String,Object>();
List<Info> infos = new ArrayList<Info>();
for(int i=0;i<10;i++) {
Info info = new Info();
info.setAccountCode("abc");
info.setAccountName("test");
infos.add(info);
}
JRBeanCollectionDataSource beans = new JRBeanCollectionDataSource(infos);
params.put("tableSource", infos);
JasperPrint print = JasperFillManager.fillReport(report , params, beans);
JasperExportManager.exportReportToPdfFile(print,"jasper.pdf");
在jrxml文件中，我创建了一个参数tableSource（它的类型是List），添加了两个字段accountName和accountCode，添加了一个'Table'报表元素，也创建了
new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($P{tableSource})
在表属性中，完整的 jrxml 文件是：
<?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="6fa4b189-7e18-456b-9307-710a8d6972c1">
<property name="ireport.zoom" value="1.0"/>
<property name="ireport.x" value="0"/>
<property name="ireport.y" value="20"/>
<style name="table">
<box>
<pen lineWidth="1.0" lineColor="#000000"/>
</box>
</style>
<style name="table_TH" mode="Opaque" backcolor="#F0F8FF">
<box>
<pen lineWidth="0.5" lineColor="#000000"/>
</box>
</style>
<style name="table_CH" mode="Opaque" backcolor="#BFE1FF">
<box>
<pen lineWidth="0.5" lineColor="#000000"/>
</box>
</style>
<style name="table_TD" mode="Opaque" backcolor="#FFFFFF">
<box>
<pen lineWidth="0.5" lineColor="#000000"/>
</box>
</style>
<style name="table 1">
<box>
<pen lineWidth="1.0" lineColor="#000000"/>
</box>
</style>
<style name="table 1_TH" mode="Opaque" backcolor="#F0F8FF">
<box>
<pen lineWidth="0.5" lineColor="#000000"/>
</box>
</style>
<style name="table 1_CH" mode="Opaque" backcolor="#BFE1FF">
<box>
<pen lineWidth="0.5" lineColor="#000000"/>
</box>
</style>
<style name="table 1_TD" mode="Opaque" backcolor="#FFFFFF">
<box>
<pen lineWidth="0.5" lineColor="#000000"/>
</box>
</style>
<subDataset name="Table Dataset 1" uuid="6d5cf195-8b52-4dfe-9f53-9e3eb5be5db3">
<field name="accountCode" class="java.lang.String"/>
<field name="accountName" class="java.lang.String"/>
</subDataset>
<parameter name="tableSource" class="java.util.List"/>
<field name="accountCode" class="java.lang.String"/>
<background>
<band splitType="Stretch"/>
</background>
<title>
<band height="79" splitType="Stretch"/>
</title>
<pageHeader>
<band height="35" splitType="Stretch"/>
</pageHeader>
<columnHeader>
<band height="61" splitType="Stretch"/>
</columnHeader>
<detail>
<band height="125" splitType="Stretch">
<componentElement>
<reportElement key="table 1" style="table 1" x="108" y="30" width="450" height="50" uuid="c7628262-8e54-4c62-b977-175f6aea984e"/>
<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="Table Dataset 1" uuid="8beea930-93ae-4fa8-826b-cebfebef3a86">
<dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($P{tableSource})]]></dataSourceExpression>
</datasetRun>
<jr:column width="90" uuid="0155325f-f82b-4b89-849c-dff724c771a9">
<jr:tableHeader style="table 1_TH" height="30" rowSpan="1">
<staticText>
<reportElement x="0" y="0" width="90" height="30" uuid="ea43a2ac-624e-4c44-a53c-60f79a2a4cd3"/>
<text><![CDATA[Account Code]]></text>
</staticText>
</jr:tableHeader>
<jr:detailCell style="table 1_TD" height="30" rowSpan="1">
<textField isStretchWithOverflow="true">
<reportElement x="0" y="0" width="90" height="20" uuid="28ac521c-37bf-4cfc-80ad-35a380e32d9a"/>
<textElement>
<font fontName="Arial" pdfFontName="STSong-Light" pdfEncoding="UniGB-UCS2-H" isPdfEmbedded="true"/>
</textElement>
<textFieldExpression><![CDATA[$F{accountCode}]]></textFieldExpression>
</textField>
</jr:detailCell>
</jr:column>
<jr:column width="90" uuid="9249d41a-f7af-4abf-9163-0a15d0a621a8">
<jr:tableHeader style="table 1_TH" height="30" rowSpan="1">
<staticText>
<reportElement x="0" y="0" width="90" height="30" uuid="81274afc-cb28-4251-8e9d-8ffe2466d2dc"/>
<text><![CDATA[Account Name]]></text>
</staticText>
</jr:tableHeader>
<jr:detailCell style="table 1_TD" height="30" rowSpan="1">
<textField isStretchWithOverflow="true">
<reportElement x="0" y="0" width="90" height="20" uuid="5876bb0e-cc9d-4d34-a2ba-483016846752"/>
<textElement>
<font fontName="Arial" pdfFontName="STSong-Light" pdfEncoding="UniGB-UCS2-H" isPdfEmbedded="true"/>
</textElement>
<textFieldExpression><![CDATA[$F{accountName}]]></textFieldExpression>
</textField>
</jr:detailCell>
</jr:column>
</jr:table>
</componentElement>
</band>
</detail>
<columnFooter>
<band height="45" splitType="Stretch"/>
</columnFooter>
<pageFooter>
<band height="54" splitType="Stretch"/>
</pageFooter>
<summary>
<band height="42" splitType="Stretch"/>
</summary>
</jasperReport>
我希望它会生成一张像下一张这样的表：
Account Code Account Name
abc test
abc test
然而，真正的结果是生成了 2 个表格，如下所示：
Account Code Account Name
abc test
abc test
Account Code Account Name
abc test
abc test
为什么会生成两个相同的表？
我正在使用 iReport 5.6.0，jasperreport 6.2.2
【问题讨论】：
-
您在主报告（详细带）中有 2 轮迭代
-
将新的 JREmptyDataSource(1) 传递给报表。
-
@PetterFriberg，谢谢你的提示，它有效，请问为什么我应该传递 JREmptyDataSource 而不是 JRCollectionDataSource？这是否意味着如果我在 jrxml 中使用 Table 组件，我总是传递 JREmptyDataSource？
-
@frank，我已经发布了一个答案来解释原因
标签： java jasper-reports