Bagaimana untuk Memaparkan Data daripada java.util.List JavaBean dalam Jalur Butiran JasperReports?

JRBeanCollectionDataSource: Bagaimana untuk menunjukkan data daripada java.util.List daripada JavaBean?

Soalan:

Dalam JavaBean, terdapat ahli data iaitu java.util.List. Bagaimanakah anda memaparkan data dalam Senarai itu dalam jalur Butiran laporan?

Jawapan:

Begini cara melakukannya:

Sampel berfungsi

Kunci mata:

• Menggunakan ungkapan _THIS
• Menggunakan komponen Senarai (jr:list) dalam band Detail

Kod untuk menjana laporan:

public static void testBuildPdf() {
    try {
        Map<String, Object> params = new HashMap<>();
        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<>();
    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);
}

Kod 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;
    }
}

Fail 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>

Keputusan:

---

Soalan berkaitan:

• Bagaimanakah cara saya mencetak senarai rentetan yang terkandung dalam senarai lain dalam iReport?
• Lulus Senarai objek jenis primitif sebagai sumber data untuk sublaporan

Atas ialah kandungan terperinci Bagaimana untuk Memaparkan Data daripada java.util.List JavaBean dalam Jalur Butiran JasperReports?. Untuk maklumat lanjut, sila ikut artikel berkaitan lain di laman web China PHP!