问题：

在jaspersoft studio中使用多个数据源

欧阳嘉

2023-03-14

在能够根据add custom data source to Jaspersoft Studio将自定义数据源从java bean添加到报表中之后，我将进入使用Jasper报告的第二点。

我有一个主要的报告，它使用一个数据库作为它的数据源。然后，我将一个bean.xml数据源添加到报表中，并将一个表添加到主报表中，主报表使用这个bean.xml数据源来获取java Beans。

我的目标是从主报表中获取一个字段值并操纵它的值，然后用这些值填充bean，最后用bean填充表。

Caused by: java.lang.NullPointerException
at net.sf.jasperreports.engine.JRAbstractScriptlet.getParameterValue(JRAbstractScriptlet.java:95)
at net.sf.jasperreports.engine.JRAbstractScriptlet.getParameterValue(JRAbstractScriptlet.java:86)
at org.iqtig.reporting.dataSource.bean.dataSourceXML.FillTable.fillTable(FillTable.java:45)
at org.iqtig.reporting.dataSource.bean.dataSourceXML.JRDataSourceFactory.createCollection(JRDataSourceFactory.java:27)
... 34 more

import java.util.Collection;
import net.sf.jasperreports.engine.JRDefaultScriptlet;
import net.sf.jasperreports.engine.JRScriptletException;

/**
 * Factory for TableCellsBean Klasse
 *
 * @author iman.gharib
 */

public class JRDataSourceFactory extends JRDefaultScriptlet {

/**
 * @return collection der TableCellsBean Objekten
 * @throws JRScriptletException
 */
public static Collection<TableCellsBean> createCollection()
        throws JRScriptletException {
    FillTable ft = new FillTable();
    Collection<TableCellsBean> reportRows = ft.fillTable();
    return reportRows;
}

}

public class TableCellsBean {

private String fieldName;
private String keyFormel;
private String mK;
private String notation;
private String item;

/**
 * Constructor.
 *
 * @param fieldName
 * @param keyFormel
 * @param mK
 * @param notation
 * @param item
 */
public TableCellsBean(final String fieldName, final String keyFormel, final String mK, final String notation, final String item) {
    this.fieldName = fieldName;
    this.keyFormel = keyFormel;
    this.mK = mK;
    this.notation = notation;
    this.item = item;
}

/**
 * Constructo Leer
 */
public TableCellsBean() {

}
public TableCellsBean getme() {
    return this;
}
// getter and setters
}

public class FillTable extends JRDefaultScriptlet {
@Override
public void afterColumnInit()
        throws JRScriptletException {
    fillTable();
}
public ArrayList<String> splitGGArray(final String kNFormelGG) {
    ArrayList<String> fieldNames = new ArrayList<>();
    String[] array = (kNFormelGG.split(" "));
    for (String sub : array) {
        fieldNames.add(sub);
    }
    return fieldNames;
}
public Collection<TableCellsBean> fillTable()
        throws JRScriptletException {
 // gg is a parameter for table dataset. It is mapped to KN_FormelGG
 // which comes from the main report data base 
    String kNFormelGG = (String) this.getParameterValue("gg");
    List<TableCellsBean> listTableCells = new ArrayList<>();
    // TableCellsBean tableCell = new TableCellsBean();
    for (String fn : splitGGArray(kNFormelGG)) {
        listTableCells.add(new TableCellsBean(fn, fn, fn, fn, fn));
        // listTableCells.add(tableCell);
    }
    // JRBeanCollectionDataSource tableCellJRBean = new JRBeanCollectionDataSource(listTableCells);
    // Map<String, Object> parameters = new HashMap<>();
    // parameters.put("FieldDataSource", tableCellJRBean);
    return listTableCells;
}
}

html prettyprint-override"><?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.3.0.final using JasperReports Library version 6.3.0  -->
<!-- 2016-08-08T14:30:03 -->
<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="main" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="4f1480cf-f8f9-420f-96b4-7fc1e41e791b">
    <property name="com.jaspersoft.studio.data.sql.tables" value=""/>
    <property name="com.jaspersoft.studio.data.defaultdataadapter" value="QIDBReport"/>
    <style name="Table_TH" mode="Opaque" backcolor="#F0F8FF">
        <box>
            <pen lineWidth="0.5" lineColor="#000000"/>
            <topPen lineWidth="0.5" lineColor="#000000"/>
            <leftPen lineWidth="0.5" lineColor="#000000"/>
            <bottomPen lineWidth="0.5" lineColor="#000000"/>
            <rightPen lineWidth="0.5" lineColor="#000000"/>
        </box>
    </style>
    <style name="Table_CH" mode="Opaque" backcolor="#BFE1FF">
        <box>
            <pen lineWidth="0.5" lineColor="#000000"/>
            <topPen lineWidth="0.5" lineColor="#000000"/>
            <leftPen lineWidth="0.5" lineColor="#000000"/>
            <bottomPen lineWidth="0.5" lineColor="#000000"/>
            <rightPen lineWidth="0.5" lineColor="#000000"/>
        </box>
    </style>
    <style name="Table_TD" mode="Opaque" backcolor="#FFFFFF">
        <box>
            <pen lineWidth="0.5" lineColor="#000000"/>
            <topPen lineWidth="0.5" lineColor="#000000"/>
            <leftPen lineWidth="0.5" lineColor="#000000"/>
            <bottomPen lineWidth="0.5" lineColor="#000000"/>
            <rightPen lineWidth="0.5" lineColor="#000000"/>
        </box>
    </style>
    <subDataset name="Dataset1" uuid="5677929d-813b-4d39-828c-de966a9d7689">
        <property name="com.jaspersoft.studio.data.defaultdataadapter" value="bean.xml"/>
        <property name="net.sf.jasperreports.data.adapter" value="bean.xml"/>
        <scriptlet name="Scriptlet_1" class="org.iqtig.reporting.dataSource.bean.mapBeanAsDatasource.JRDataSourceFactory"/>
        <parameter name="gg" class="java.lang.String"/>
        <field name="item" class="java.lang.String">
            <fieldDescription><![CDATA[item]]></fieldDescription>
        </field>
        <field name="fieldName" class="java.lang.String">
            <fieldDescription><![CDATA[fieldName]]></fieldDescription>
        </field>
        <field name="me" class="org.iqtig.reporting.dataSource.bean.dataSourceXML.TableCellsBean">
            <fieldDescription><![CDATA[me]]></fieldDescription>
        </field>
        <field name="keyFormel" class="java.lang.String">
            <fieldDescription><![CDATA[keyFormel]]></fieldDescription>
        </field>
        <field name="mK" class="java.lang.String">
            <fieldDescription><![CDATA[mK]]></fieldDescription>
        </field>
    </subDataset>
    <parameter name="LB_ID" class="java.lang.Integer">
        <defaultValueExpression><![CDATA[62]]></defaultValueExpression>
    </parameter>
    <parameter name="KN_OffeziellGruppe" class="java.lang.Integer">
        <defaultValueExpression><![CDATA[3]]></defaultValueExpression>
    </parameter>
    <parameter name="FieldDataSource" class="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource" isForPrompting="false"/>
    <parameter name="KN_FormelGG" class="java.lang.String" isForPrompting="false"/>
    <queryString>
        <![CDATA[select * from "KennzahlReferenz2015_QIBericht",  "Images" 
where LB_ID =  $P{LB_ID} 
and KN_OffiziellGruppe =  $P{KN_OffeziellGruppe}
and  IMG_ID = 1]]>
    </queryString>
    <field name="QI_Praefix" class="java.lang.String"/>
    <field name="KN_Id" class="java.lang.Integer"/>
    <field name="bewertungsArtTypNameKurz" class="java.lang.String"/>
    <field name="refbereich" class="java.lang.String"/>
    <field name="refbereichVorjahres" class="java.lang.String"/>
    <field name="KN_GGAlleinstehend" class="java.lang.String"/>
    <field name="erlaueterungDerRechregeln" class="java.lang.String"/>
    <field name="teildatensatzbezug" class="java.lang.String"/>
    <field name="mindesanzahlZaeler" class="java.lang.Integer"/>
    <field name="mindesanzahlNenner" class="java.lang.Integer"/>
    <field name="KN_FormelZ" class="java.lang.String"/>
    <field name="KN_FormelGG" class="java.lang.String"/>
    <field name="verwendeteFunktionen" class="java.lang.String"/>
    <field name="idLb" class="java.lang.String"/>
    <field name="LB_LangBezeichnung" class="java.lang.String"/>
    <field name="LB_ID" class="java.lang.Integer"/>
    <field name="nameAlleinstehend" class="java.lang.String"/>
    <field name="KN_BezeichnungAlleinstehendKurz" class="java.lang.String"/>
    <field name="QI_ID" class="java.lang.Integer"/>
    <field name="IMG_ID" class="java.lang.Integer"/>
    <field name="Name" class="java.lang.String"/>
    <field name="Image" class="java.lang.Object"/>
    <group name="id" isStartNewPage="true">
        <groupExpression><![CDATA[$F{KN_Id}]]></groupExpression>
        <groupHeader>
            <band height="44"/>
        </groupHeader>
        <groupFooter>
            <band height="50"/>
        </groupFooter>
    </group>
    <background>
        <band splitType="Stretch"/>
    </background>
    <title>
        <band height="44" splitType="Stretch"/>
    </title>
    <pageHeader>
        <band height="35" splitType="Stretch"/>
    </pageHeader>
    <columnHeader>
        <band height="34" splitType="Stretch"/>
    </columnHeader>
    <detail>
        <band height="149" splitType="Stretch">
            <componentElement>
                <reportElement x="170" y="20" width="350" height="100" uuid="38d917fb-dfc2-4c08-890a-09cfe6e2214d">
                    <property name="com.jaspersoft.studio.layout" value="com.jaspersoft.studio.editor.layout.VerticalRowLayout"/>
                    <property name="com.jaspersoft.studio.table.style.table_header" value="Table_TH"/>
                    <property name="com.jaspersoft.studio.table.style.column_header" value="Table_CH"/>
                    <property name="com.jaspersoft.studio.table.style.detail" value="Table_TD"/>
                    <property name="net.sf.jasperreports.export.headertoolbar.table.name" value=""/>
                    <property name="com.jaspersoft.studio.components.autoresize.proportional" value="true"/>
                </reportElement>
                <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" whenNoDataType="AllSectionsNoDetail">
                    <datasetRun subDataset="Dataset1" uuid="1b3548f6-7d6b-4070-bb8e-aaefbabdc7c9">
                        <datasetParameter name="gg">
                            <datasetParameterExpression><![CDATA[$F{KN_FormelGG}]]></datasetParameterExpression>
                        </datasetParameter>
                    </datasetRun>
                    <jr:column width="70" uuid="048812d7-0ed1-4db8-a09a-e6242f77c6ce">
                        <property name="com.jaspersoft.studio.components.table.model.column.name" value="Column1"/>
                        <jr:tableHeader style="Table_TH" height="30" rowSpan="1"/>
                        <jr:detailCell style="Table_TD" height="30">
                            <textField>
                                <reportElement x="0" y="0" width="70" height="30" uuid="c5aaea84-1367-41df-be8d-7f71e3ea5153"/>
                                <textFieldExpression><![CDATA[$F{item}]]></textFieldExpression>
                            </textField>
                        </jr:detailCell>
                    </jr:column>
                    <jr:column width="70" uuid="11b85ada-c9fe-42b6-a646-8bd1697cdec2">
                        <property name="com.jaspersoft.studio.components.table.model.column.name" value="Column2"/>
                        <jr:tableHeader style="Table_TH" height="30" rowSpan="1"/>
                        <jr:detailCell style="Table_TD" height="30">
                            <textField>
                                <reportElement x="0" y="0" width="70" height="30" uuid="728ff44d-1dbd-404c-b8b3-7cc0e1f07f60"/>
                                <textFieldExpression><![CDATA[$F{fieldName}]]></textFieldExpression>
                            </textField>
                        </jr:detailCell>
                    </jr:column>
                    <jr:column width="70" uuid="892f30cb-fb41-444f-889b-1e005484c35e">
                        <property name="com.jaspersoft.studio.components.table.model.column.name" value="Column3"/>
                        <jr:tableHeader style="Table_TH" height="30" rowSpan="1"/>
                        <jr:detailCell style="Table_TD" height="30">
                            <textField>
                                <reportElement x="0" y="0" width="70" height="30" uuid="e38ac951-71bc-45a6-8ed2-313805a77050"/>
                                <textFieldExpression><![CDATA[$F{keyFormel}]]></textFieldExpression>
                            </textField>
                        </jr:detailCell>
                    </jr:column>
                    <jr:column width="70" uuid="7d0d700a-5a75-4c26-94c0-9ef7c53bd719">
                        <property name="com.jaspersoft.studio.components.table.model.column.name" value="Column4"/>
                        <jr:tableHeader style="Table_TH" height="30" rowSpan="1">
                            <textField>
                                <reportElement x="0" y="0" width="70" height="30" uuid="68577007-0344-406c-8aa2-3127d1da1c65"/>
                            </textField>
                        </jr:tableHeader>
                        <jr:detailCell style="Table_TD" height="30">
                            <textField>
                                <reportElement x="0" y="0" width="70" height="30" uuid="873d63c1-1b91-4441-b7bd-f67db7729e7f"/>
                                <textFieldExpression><![CDATA[$F{mK}]]></textFieldExpression>
                            </textField>
                        </jr:detailCell>
                    </jr:column>
                    <jr:column width="70" uuid="cf5a1a2f-594d-429f-8925-62d001e1dd00">
                        <property name="com.jaspersoft.studio.components.table.model.column.name" value="Column5"/>
                        <jr:tableHeader style="Table_TH" height="30" rowSpan="1">
                            <textField>
                                <reportElement x="0" y="0" width="70" height="30" uuid="7fb46eb8-d0e1-44ab-89f9-ec31d49b8109"/>
                                <textFieldExpression><![CDATA[$P{gg}]]></textFieldExpression>
                            </textField>
                        </jr:tableHeader>
                        <jr:detailCell style="Table_TD" height="30"/>
                    </jr:column>
                </jr:table>
            </componentElement>
            <textField>
                <reportElement x="20" y="80" width="100" height="30" uuid="b89cd04c-2569-43ef-9730-445b874855dd"/>
                <textFieldExpression><![CDATA[$F{KN_FormelGG}]]></textFieldExpression>
            </textField>
            <staticText>
                <reportElement x="20" y="32" width="100" height="30" uuid="e91b4461-5e53-4f85-8992-14e69a1aa05f"/>
                <text><![CDATA[KN_FormelGG]]></text>
            </staticText>
        </band>
    </detail>
    <columnFooter>
        <band height="45" splitType="Stretch"/>
    </columnFooter>
    <pageFooter>
        <band height="54" splitType="Stretch"/>
    </pageFooter>
    <summary>
        <band height="42" splitType="Stretch"/>
    </summary>
</jasperReport>

共有1个答案

郭麒

2023-03-14

我的目标是从主报表中获取一个字段值并操纵它的值，然后用这些值填充bean，最后用bean填充表。

我将忽略您的所有脚本和其他代码，并向您展示使用当前字段、变量或参数值为另一个组件创建动态数据源的最简单方法。

作为示例，我们将在field1(row1，row2)中有这些字符串值

Test1_1.23:Test2_4.32:Test3_1.08
Test1_2.12:Test2_5.12:Test3_2.13

public class TableCellsBean {

    private String name;
    private double value;

    public TableCellsBean(String name,double value){
        this.name = name;
        this.value = value;
    }
    public static JRBeanCollectionDataSource getDatasource(String fieldValue){
        List<TableCellsBean> retList = new ArrayList<>();
        String[] values = fieldValue.split(":");
        for (String v : values) {
            String[] sp = v.split("_");
            retList.add(new TableCellsBean(sp[0], Double.parseDouble(sp[1])));
        }
        return new JRBeanCollectionDataSource(retList);
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public double getValue() {
        return value;
    }
    public void setValue(double value) {
        this.value = value;
    }
}

<subDataset name="table_dataset" uuid="4dc1b0fb-2588-4f98-8c8d-f0afefbb2fd1">
    <field name="name" class="java.lang.String"/>
    <field name="value" class="java.lang.Double"/>
 </subDataset>

<dataSourceExpression><![CDATA[my.package.TableCellsBean.getDatasource($F{field1})]]></dataSourceExpression>

<?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="test" language="java" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="886a547e-11bd-434b-a330-d93ee5e4a280">
    <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>
    <subDataset name="table_dataset" uuid="4dc1b0fb-2588-4f98-8c8d-f0afefbb2fd1">
        <field name="name" class="java.lang.String"/>
        <field name="value" class="java.lang.Double"/>
    </subDataset>
    <field name="field1" class="java.lang.String">
        <fieldDescription><![CDATA[_THIS]]></fieldDescription>
    </field>
    <detail>
        <band height="40" splitType="Stretch">
            <textField>
                <reportElement x="0" y="0" width="555" height="20" uuid="a73343b1-ccb2-4a59-b882-381b98efd664"/>
                <textElement verticalAlignment="Middle"/>
                <textFieldExpression><![CDATA[$F{field1}]]></textFieldExpression>
            </textField>
            <componentElement>
                <reportElement key="table" style="table" x="0" y="20" width="555" height="20" uuid="09a9a5b8-499b-40d2-b391-ece25772a31e"/>
                <jr:table xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd">
                    <datasetRun subDataset="table_dataset" uuid="05601bdb-5579-4253-90f7-6742739d9714">
                        <dataSourceExpression><![CDATA[bounty.TableCellsBean.getDatasource($F{field1})]]></dataSourceExpression>
                    </datasetRun>
                    <jr:column width="90" uuid="afbbb3d0-573a-495d-ab51-0ae4d601e6fb">
                        <jr:tableHeader style="table_TH" height="20" rowSpan="1">
                            <staticText>
                                <reportElement x="0" y="0" width="90" height="20" uuid="e476f026-bbec-4b19-9bd4-f4b21f3377ef"/>
                                <textElement textAlignment="Center" verticalAlignment="Middle"/>
                                <text><![CDATA[Name]]></text>
                            </staticText>
                        </jr:tableHeader>
                        <jr:detailCell style="table_TD" height="20" rowSpan="1">
                            <textField>
                                <reportElement x="0" y="0" width="90" height="20" uuid="49cac181-b16b-4ab3-b600-78a56fb0f42b"/>
                                <box leftPadding="3" rightPadding="3"/>
                                <textElement verticalAlignment="Middle"/>
                                <textFieldExpression><![CDATA[$F{name}]]></textFieldExpression>
                            </textField>
                        </jr:detailCell>
                    </jr:column>
                    <jr:column width="90" uuid="4a1b0759-c347-4294-82c5-3aed4762f0c4">
                        <jr:tableHeader style="table_TH" height="20" rowSpan="1">
                            <staticText>
                                <reportElement x="0" y="0" width="90" height="20" uuid="bfa965b5-b5a4-484d-bfbd-d8bc753718b1"/>
                                <textElement textAlignment="Center" verticalAlignment="Middle"/>
                                <text><![CDATA[Value]]></text>
                            </staticText>
                        </jr:tableHeader>
                        <jr:detailCell style="table_TD" height="20" rowSpan="1">
                            <textField>
                                <reportElement x="0" y="0" width="90" height="20" uuid="925192bc-a761-48f5-bad5-097d15587198"/>
                                <box leftPadding="3" rightPadding="3"/>
                                <textElement textAlignment="Right" verticalAlignment="Middle"/>
                                <textFieldExpression><![CDATA[$F{value}]]></textFieldExpression>
                            </textField>
                        </jr:detailCell>
                    </jr:column>
                </jr:table>
            </componentElement>
        </band>
    </detail>
</jasperReport>

添加导出到pdf的主方法

public static void main(String[] args) throws JRException {
    //Compile report
    JasperReport report = JasperCompileManager.compileReport("myJasperReport.jrxml");
    //Setting up some arbitrary data to test the auto creation of datasource
    List<String> someData = new ArrayList<>();
    someData.add("Test1_1.23:Test2_4.32:Test3_1.08");
    someData.add("Test1_2.12:Test2_5.12:Test3_2.13");
    //Fill report
    JasperPrint jasperPrint = JasperFillManager.fillReport(report, new HashMap<>(),new JRBeanCollectionDataSource(someData));
    //Export to pdf
    JRPdfExporter exporter = new JRPdfExporter();       
    exporter.setExporterInput(new SimpleExporterInput(jasperPrint));
    exporter.setExporterOutput(new SimpleOutputStreamExporterOutput("myJasperReport.pdf"));
    SimplePdfExporterConfiguration configuration = new SimplePdfExporterConfiguration();
    exporter.setConfiguration(configuration);
    exporter.exportReport();
}

根据正在运行的报表值（字段、变量、参数）为组件提供自定义数据源的最简单方法是创建一个生成数据源的方法，并在DatasourceExpression中调用该方法

类似资料：

在Spring中使用多个数据源

谢谢，克里斯
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