java代码（或Bean）

Question

根据Add custom data source to Jaspersoft Studio能够将java bean中的自定义数据源添加到报表后，我将使用jasper进入报表的第二点。

我有一个主报告，它使用数据库作为其数据源。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，该报表使用此bean.xml数据源来获取java bean。

我的目标是从主报告中获取字段值并进行操作它的值，然后用这些值填充bean，最后填充表与豆。

为此，我编写了3个类，我在表数据集中用作 Scriptlet ：

这是我需要做的事情的说明：

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

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

如果我分配一个像String kNFormelGG ="Test me"这样的修复值，则bean连接不会遇到错误，并且在将bean.xml指定为Dataset1中的Default Data Adapter的值后，它会使用静态值填充表。如何从主报表数据源动态获取参数或值中的数据并在bean中使用它？我有这样的假设：在从我的适配器调用静态工厂类时，字段仍然是空的。也许我错了，但我没有找到任何其他声明来解决这个问题。

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;
}

}

Bean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字段值并进行操作它的值，然后用这些值填充bean，最后填充桌上的豆子。

我将忽略所有的scriplet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）中包含这些String值

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

我们想要在:上拆分并创建行（Bean列表），然后在_上拆分以创建列（bean上的属性）并在jr:table组件中显示它。

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;
    }
}

正如您在此bean类中已经看到的那样，我添加了一个静态方法，该方法根据作为参数传递的值返回JRBeanCollectionDataSource。

基本上你将fieldValue传递给这个方法，它会做一些逻辑，创建TableCellBean，将它们添加到列表并返回JRBeanCollectionDataSource

注意：该方法不需要是静态的，也不需要在此类中，此外不考虑异常处理。

报告 - jrxml

例如，我们会在第1行field1和第2行包含Test1_1.23:Test2_4.32:Test3_1.08。

我们定义一个代表Test1_2.12:Test2_5.12:Test3_2.13

的子数据集

TableCellsBean

作为数据源，我们调用静态方法传递当前行中的<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>内容。

field1

完整jrxml

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

测试示例

添加要导出为pdf的主要方法

<?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>

输出

结论

根据运行的报告值（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(); }

中调用它

在jaspersoft studio中使用多个数据源

1 个答案:

java代码（或Bean）

报告 - jrxml

测试示例

输出

结论