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JRBeanCollectionDataSource: Comment afficher les données de Java.util.List à partir de JavaBean?

Mon JavaBean contient le Java.util.List.

Userinfo {
    private String username;
    private String password;
    List<Address> listAddress;
}

Comment afficher les données de cette Liste dans la bande Détail?

javajasper-reports
25
Gaohongyan

Voici l'exemple de travail.

Les points clés de cet échantillon:

  • utilisation de _THIS expression;
  • en utilisant List (jr: list) composant dans Detail band

L'extrait de code pour générer un rapport:

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);
}

Le code JavaBean:

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;
    }
}

Le fichier jrxml:

<?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>

Le résultat sera:

The resulting report in PDF format

Les autres questions connexes sont la question Comment imprimer une liste de chaînes contenues dans une autre liste dans iReport? et Passer la liste des objets de type primitif comme source de données pour le sous-rapport question.

45
Alex K