JRBeanCollectionDataSource：如何从 JavaBean 显示来自 java.util.List 的数据？
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【中文标题】JRBeanCollectionDataSource：如何从 JavaBean 显示来自 java.util.List 的数据？【英文标题】：JRBeanCollectionDataSource: How to show data from the java.util.List from JavaBean? 【发布时间】：2012-08-25 21:57:18 【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波段显示这个List的数据？
【问题讨论】：
你能帮我解决这个问题吗？ ***.com/questions/55262894/… 【参考方案1】：这是工作示例。
本示例的要点：
使用_THIS表达式；
在 Detail 波段中使用 List (jr:list) 组件
生成报告的代码sn-p：
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：
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 splitType="Stretch">
<staticText>
<reportElement x="138" y="28" />
<textElement textAlignment="Center" verticalAlignment="Middle">
<font isBold="true" isItalic="true"/>
</textElement>
<text><![CDATA[Bean with List sample]]></text>
</staticText>
</band>
</title>
<columnHeader>
<band >
<staticText>
<reportElement x="0" y="0" />
<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" />
<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 splitType="Stretch">
<textField>
<reportElement stretchType="RelativeToTallestObject" x="0" y="0" />
<box leftPadding="10">
<topPen lineWidth="1.0"/>
<leftPen lineWidth="1.0"/>
<bottomPen lineWidth="1.0"/>
<rightPen lineWidth="1.0"/>
</box>
<textElement/>
<textFieldExpression><![CDATA[$Fid]]></textFieldExpression>
</textField>
<componentElement>
<reportElement x="100" y="0" />
<jr:list xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd" printOrder="Vertical">
<datasetRun subDataset="dataset1">
<dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($Fcities)]]></dataSourceExpression>
</datasetRun>
<jr:listContents >
<textField>
<reportElement x="0" y="0" />
<box leftPadding="10">
<topPen lineWidth="1.0"/>
<leftPen lineWidth="1.0"/>
<bottomPen lineWidth="1.0"/>
<rightPen lineWidth="1.0"/>
</box>
<textElement/>
<textFieldExpression><![CDATA[$Fcity]]></textFieldExpression>
</textField>
</jr:listContents>
</jr:list>
</componentElement>
</band>
</detail>
</jasperReport>
结果将是：
其他相关问题是How do I print a list of strings contained within another list in iReport? 问题和Passing the List of primitive type objects as datasource for subreport 问题。
【讨论】：
您有城市列表，但在public List<String> getCities()。这意味着您可以使用cities名称
我在上次编辑时将其切换为此语法，以使其更清晰，如果您不喜欢它，请随时回滚。【参考方案2】：
public void generisiIzvestaj(HttpServletRequest request, HttpServletResponse response) throws Exception
List<Predstava> predstave = (List<Predstava>)request.getSession().getAttribute("predstaveR");
JRBeanCollectionDataSource dataSource = new JRBeanCollectionDataSource(predstave);
InputStream inputStream = this.getClass().getResourceAsStream("/reports/Predstave.jrxml");
JasperReport jasperReport = JasperCompileManager.compileReport(inputStream);
Map<String, Object> params = new HashMap<String, Object>();
JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, params, dataSource);
inputStream.close();
response.setContentType("application/x-download");
response.addHeader("Content-disposition", "attachment; filename=PredstaveRezisera.pdf");
ServletOutputStream out = response.getOutputStream();
JasperExportManager.exportReportToPdfStream(jasperPrint,out);
【讨论】：
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