java - 在 jaspersoft studio 中处理多个数据源

Question

在能够根据Add custom data source to Jaspersoft Studio将自定义数据源从 java bean 添加到报告后，我使用 jasper 进行报告的第二点。

我有一个使用数据库作为数据源的主报告。然后我在报表中添加一个 bean.xml 数据源，并在主报表中添加一个表，该表使用这个 bean.xml 数据源来获取 Java bean。

我的目标是从主报告中获取一个字段值并操作它的值，然后用这些值填充 bean，最后用 bean 填充表。

为此，我编写了 3 个类，我在表数据集中用作Scriptlet：

这是我需要做的说明：

问题出在 FillTable 类中，当我String kNFormelGG = (String) this.getParameterValue("gg");使用创建的 bean.xml 时，测试连接失败java.lang.reflect.InvocationTargetException

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

如果我分配一个固定值String kNFormelGG ="Test me"，例如 bean 连接没有遇到错误，并且在将 bean.xml 分配为 Dataset1 中的默认数据适配器的值之后，它会用静态值填充表。如何从主报表数据源动态获取参数或值的数据并在 bean 中使用？我假设在从我的适配器调用静态工厂类时，这些字段仍然是空的。也许我错了，但我没有找到任何其他关于这个问题的声明。

BeanFactory 类

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;
}

}

豆类

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
}

准备和创建 bean 的类

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;
}
}

JRXML

<?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>

Answer 1

我的目标是从主报告中获取一个字段值并操作它的值，然后用这些值填充 bean，最后用 bean 填充表。

我将忽略您所有的脚本和其他代码，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。

例如，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

我们要拆分:并创建行（bean 列表），然后拆分_以创建列（bean 上的属性）并将其显示在jr:table组件中。

java代码（或Bean）

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;
    }
}

正如您已经在这个 bean 类中看到的那样，我添加了一个静态方法，该方法返回一个JRBeanCollectionDataSource取决于作为参数传递的值。

基本上，您将 a 传递fieldValue给此方法，它会执行一些逻辑，创建TableCellBean，将它们添加到列表并返回 aJRBeanCollectionDataSource

注意：该方法不需要是静态的，也不需要在这个类内部，而且不考虑异常处理。

报告 - jrxml

在示例中，我们将在第 1 行和第 2 行 field1包含内容。Test1_1.23:Test2_4.32:Test3_1.08Test1_2.12:Test2_5.12:Test3_2.13

我们定义了一个子数据集，表示TableCellsBean

<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>

作为数据源，我们调用静态方法传递field1当前行中的内容。

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

完整的jrxml

<?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>

测试示例

添加主要方法以导出为pdf

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();
}

输出

结论

根据运行报告值（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