JRBeanCollectionDataSource:如何显示来自 JavaBean 的 java.util.List 中的数据? [英] JRBeanCollectionDataSource: How to show data from the java.util.List from JavaBean?
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问题描述
我的 JavaBean 包含 java.util.List.
Userinfo {
private String username;
private String password;
List<Address> listAddress;
}
如何在Detail区域显示这个List的数据?
How to show the data of this List in the Detail band?
推荐答案
这是工作示例.
这个样本的要点:
Here is the working sample.
The key points of this sample:
_THIS
表达式的使用;- 在Detail带 中使用List (jr:list)组件
生成报告的代码片段:
public static void testBuildPdf() {
try {
Map<String, Object> params = new HashMap<String, Object>();
JasperReport jasperReport = JasperCompileManager.compileReport(reportSource);
JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, params, getDataSource());
JasperExportManager.exportReportToPdfFile(jasperPrint, outputFileName);
} catch (Exception e) {
e.printStackTrace();
}
}
private static JRDataSource getDataSource() {
Collection<BeanWithList> coll = new ArrayList<BeanWithList>();
coll.add(new BeanWithList(Arrays.asList("London", "Paris"), 1));
coll.add(new BeanWithList(Arrays.asList("London", "Madrid", "Moscow"), 2));
coll.add(new BeanWithList(Arrays.asList("Rome"), 3));
return new JRBeanCollectionDataSource(coll);
}
JavaBean 代码:
The JavaBean code:
public class BeanWithList {
// The member's name can be any. The JR engine is using public getter for extracting field's value
private List<String> cities;
private Integer id;
public BeanWithList(List<String> cities, Integer id) {
this.cities = cities;
this.id = id;
}
// getter should be public
public List<String> getCities() {
return this.cities;
}
public Integer getId() {
return this.id;
}
}
jrxml 文件:
<?xml version="1.0" encoding="UTF-8"?>
<jasperReport ...>
<subDataset name="dataset1">
<field name="city" class="java.lang.String">
<fieldDescription><![CDATA[_THIS]]></fieldDescription>
</field>
</subDataset>
<field name="id" class="java.lang.Integer"/>
<field name="cities" class="java.util.Collection"/>
<title>
<band height="103" splitType="Stretch">
<staticText>
<reportElement x="138" y="28" width="258" height="20"/>
<textElement textAlignment="Center" verticalAlignment="Middle">
<font isBold="true" isItalic="true"/>
</textElement>
<text><![CDATA[Bean with List sample]]></text>
</staticText>
</band>
</title>
<columnHeader>
<band height="20">
<staticText>
<reportElement x="0" y="0" width="100" height="20"/>
<box>
<topPen lineWidth="1.0"/>
<leftPen lineWidth="1.0"/>
<bottomPen lineWidth="1.0"/>
<rightPen lineWidth="1.0"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle">
<font isBold="true" isItalic="true" isUnderline="false"/>
</textElement>
<text><![CDATA[Id]]></text>
</staticText>
<staticText>
<reportElement x="100" y="0" width="100" height="20"/>
<box>
<topPen lineWidth="1.0"/>
<leftPen lineWidth="1.0"/>
<bottomPen lineWidth="1.0"/>
<rightPen lineWidth="1.0"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle">
<font isBold="true" isItalic="true" isUnderline="false"/>
</textElement>
<text><![CDATA[City name]]></text>
</staticText>
</band>
</columnHeader>
<detail>
<band height="20" splitType="Stretch">
<textField>
<reportElement stretchType="RelativeToTallestObject" x="0" y="0" width="100" height="20"/>
<box leftPadding="10">
<topPen lineWidth="1.0"/>
<leftPen lineWidth="1.0"/>
<bottomPen lineWidth="1.0"/>
<rightPen lineWidth="1.0"/>
</box>
<textElement/>
<textFieldExpression><![CDATA[$F{id}]]></textFieldExpression>
</textField>
<componentElement>
<reportElement x="100" y="0" width="400" height="20"/>
<jr:list xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd" printOrder="Vertical">
<datasetRun subDataset="dataset1">
<dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($F{cities})]]></dataSourceExpression>
</datasetRun>
<jr:listContents height="20" width="400">
<textField>
<reportElement x="0" y="0" width="100" height="20"/>
<box leftPadding="10">
<topPen lineWidth="1.0"/>
<leftPen lineWidth="1.0"/>
<bottomPen lineWidth="1.0"/>
<rightPen lineWidth="1.0"/>
</box>
<textElement/>
<textFieldExpression><![CDATA[$F{city}]]></textFieldExpression>
</textField>
</jr:listContents>
</jr:list>
</componentElement>
</band>
</detail>
</jasperReport>
结果将是:
其他相关问题是 如何在 iReport 中打印包含在另一个列表中的字符串列表? 问题和 传递原始列表类型对象作为子报表的数据源 问题.
Other related questions are the How do I print a list of strings contained within another list in iReport? question and Passing the List of primitive type objects as datasource for subreport question.
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