如何使用JSON作为数据源创建子组？

时间：2016-11-18 17:41:47

标签： java json jasper-reports

我希望有一个报告显示我的Orders按Currency和Country分类，分组。

它应该是这样的：

EUR
 - Germany
   - (only orders with EUR as currency and order made in Germany)
 - France
   - (only orders with EUR as currency and order made in France)

US
  - USA
   - (only orders with US as currency and order made in USA)

所以，我想创建一个master报告，其中有2个subreports：

master
  - subreport grouping orders by currency
    - subreport grouping orders by country
      - subreport listing the orders

所以我这样做了：

master.jrxml 

<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.1.0.final using JasperReports Library version 6.1.0  -->
<!-- 2016-11-18T18:37:36 -->
<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="master" pageWidth="595" pageHeight="842" columnWidth="515" leftMargin="40" rightMargin="40" topMargin="50" bottomMargin="50" uuid="bbe115b5-a5a0-4b39-9b73-7092dc59ab6d">
    <property name="com.jaspersoft.studio.data.defaultdataadapter" value="Demo JSON Data Adapter "/>
    <property name="net.sf.jasperreports.json.source" value="/home/vasi/git/valter/reports/Demo/data/northwind.json"/>
    <style name="Sans_Normal" isDefault="true" fontName="DejaVu Sans" fontSize="12" isBold="false" isItalic="false" isUnderline="false" isStrikeThrough="false"/>
    <style name="Sans_Normal_8" style="Sans_Normal" fontSize="8"/>
    <style name="Sans_Bold" fontName="DejaVu Sans" fontSize="12" isBold="true" isItalic="false" isUnderline="false" isStrikeThrough="false"/>
    <style name="Sans_Bold_8" style="Sans_Bold" fontSize="8"/>
    <queryString language="json">
        <![CDATA[Northwind]]>
    </queryString>
    <field name="Customers" class="java.lang.String">
        <fieldDescription><![CDATA[Customers]]></fieldDescription>
    </field>
    <field name="Orders" class="java.lang.String">
        <fieldDescription><![CDATA[Orders]]></fieldDescription>
    </field>
    <title>
        <band height="50">
            <line>
                <reportElement x="0" y="0" width="515" height="1" uuid="fc148b4e-50df-4a12-aa14-8505a4cfa6e1"/>
            </line>
            <staticText>
                <reportElement style="Sans_Normal" x="0" y="10" width="515" height="30" uuid="5bf7651c-cd6b-4eaf-b65a-1413d60faab0"/>
                <textElement textAlignment="Center">
                    <font size="22"/>
                </textElement>
                <text><![CDATA[Orders sorted by currency and country]]></text>
            </staticText>
        </band>
    </title>
    <detail>
        <band height="70">
            <subreport isUsingCache="true">
                <reportElement x="0" y="0" width="515" height="70" uuid="ebd4e147-b294-4367-a072-dc1954980232"/>
                <subreportParameter name="REPORT_DATA_SOURCE">
                    <subreportParameterExpression><![CDATA[((net.sf.jasperreports.engine.data.JsonDataSource)$P{REPORT_DATA_SOURCE}).subDataSource("Orders")]]></subreportParameterExpression>
                </subreportParameter>
                <subreportExpression><![CDATA["reports/orders/subreport/currency.jasper"]]></subreportExpression>
            </subreport>
        </band>
    </detail>
</jasperReport>

子报表/ currency.jrxml 

    <?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.1.0.final using JasperReports Library version 6.1.0  -->
<!-- 2016-11-18T18:38:23 -->
<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="currency" pageWidth="515" pageHeight="742" columnWidth="515" leftMargin="0" rightMargin="0" topMargin="0" bottomMargin="0" uuid="bbe115b5-a5a0-4b39-9b73-7092dc59ab6d">
    <style name="Sans_Normal" isDefault="true" fontName="DejaVu Sans" fontSize="12" isBold="false" isItalic="false" isUnderline="false" isStrikeThrough="false"/>
    <style name="Sans_Normal_8" style="Sans_Normal" fontSize="8"/>
    <style name="Sans_Bold" fontName="DejaVu Sans" fontSize="12" isBold="true" isItalic="false" isUnderline="false" isStrikeThrough="false"/>
    <style name="Sans_Bold_8" style="Sans_Bold" fontSize="8"/>
    <field name="Currency" class="java.lang.String">
        <property name="net.sf.jasperreports.json.field.expression" value="Currency"/>
    </field>
    <sortField name="Currency"/>
    <group name="CurrencyGroup" isReprintHeaderOnEachPage="true">
        <groupExpression><![CDATA[$F{Currency}]]></groupExpression>
        <groupHeader>
            <band height="21">
                <textField>
                    <reportElement style="Sans_Bold" x="5" y="5" width="100" height="15" isPrintWhenDetailOverflows="true" uuid="0aaeed6e-7ba1-4ab9-be59-d6ca702995fc"/>
                    <textFieldExpression><![CDATA[$F{Currency}]]></textFieldExpression>
                </textField>
                <line>
                    <reportElement x="0" y="20" width="515" height="1" isPrintWhenDetailOverflows="true" uuid="6d76c22c-329f-4e77-a886-8580d3cb6bc1"/>
                </line>
            </band>
        </groupHeader>
        <groupFooter>
            <band height="31"/>
        </groupFooter>
    </group>
    <pageHeader>
        <band height="21">
            <staticText>
                <reportElement style="Sans_Bold" mode="Opaque" x="0" y="5" width="515" height="15" forecolor="#FFFFFF" backcolor="#333333" uuid="da0f1cad-f552-424b-bf19-b41cabbfa4ac"/>
                <text><![CDATA[Currency]]></text>
            </staticText>
        </band>
    </pageHeader>
    <detail>
        <band height="60">
            <subreport>
                <reportElement x="10" y="10" width="490" height="40" uuid="d181a0e1-1a31-4723-abe7-8f2f3dc09bce"/>
                <subreportParameter name="REPORT_DATA_SOURCE">
                    <subreportParameterExpression><![CDATA[((net.sf.jasperreports.engine.data.JsonDataSource)$P{REPORT_DATA_SOURCE}).subDataSource()]]></subreportParameterExpression>
                </subreportParameter>
                <subreportExpression><![CDATA["reports/orders/subreport/subreport/countries.jasper"]]></subreportExpression>
            </subreport>
        </band>
    </detail>
</jasperReport>

但是，我不知道如何将我的数据源从子报表传递到子报表。从master报告到我的子报告，这没关系，但我坚持这个例外：

net.sf.jasperreports.engine.JRException: net.sf.jasperreports.engine.JRRuntimeException: net.sf.jasperreports.engine.fill.JRExpressionEvalException: Error evaluating expression for source text: ((net.sf.jasperreports.engine.data.JsonDataSource)$P{REPORT_DATA_SOURCE}).subDataSource()
    at com.jaspersoft.studio.editor.preview.view.control.ReportControler.fillReport(ReportControler.java:506)
    at com.jaspersoft.studio.editor.preview.view.control.ReportControler.access$20(ReportControler.java:481)
    at com.jaspersoft.studio.editor.preview.view.control.ReportControler$5.run(ReportControler.java:362)
    at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused by: net.sf.jasperreports.engine.JRRuntimeException: net.sf.jasperreports.engine.fill.JRExpressionEvalException: Error evaluating expression for source text: ((net.sf.jasperreports.engine.data.JsonDataSource)$P{REPORT_DATA_SOURCE}).subDataSource()
    at net.sf.jasperreports.engine.fill.JRFillSubreport.prepare(JRFillSubreport.java:872)
    at net.sf.jasperreports.engine.fill.JRFillElementContainer.prepareElements(JRFillElementContainer.java:330)
    at net.sf.jasperreports.engine.fill.JRFillBand.fill(JRFillBand.java:382)
    at net.sf.jasperreports.engine.fill.JRFillBand.fill(JRFillBand.java:357)
    at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillColumnBand(JRVerticalFiller.java:2031)
    at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillDetail(JRVerticalFiller.java:755)
    at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReportStart(JRVerticalFiller.java:262)
    at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(JRVerticalFiller.java:122)
    at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:551)
    at net.sf.jasperreports.engine.fill.BaseFillHandle$ReportFill.run(BaseFillHandle.java:119)
    at java.lang.Thread.run(Unknown Source)
Caused by: net.sf.jasperreports.engine.fill.JRExpressionEvalException: Error evaluating expression for source text: ((net.sf.jasperreports.engine.data.JsonDataSource)$P{REPORT_DATA_SOURCE}).subDataSource()
    at net.sf.jasperreports.engine.fill.JREvaluator.evaluate(JREvaluator.java:264)
    at net.sf.jasperreports.engine.fill.JRCalculator.evaluate(JRCalculator.java:610)
    at net.sf.jasperreports.engine.fill.JRCalculator.evaluate(JRCalculator.java:578)
    at net.sf.jasperreports.engine.fill.JRFillSubreport.getParameterValues(JRFillSubreport.java:680)
    at net.sf.jasperreports.engine.fill.JRFillSubreport.evaluateParameterValues(JRFillSubreport.java:478)
    at net.sf.jasperreports.engine.fill.JRFillSubreport.evaluateSubreport(JRFillSubreport.java:458)
    at net.sf.jasperreports.engine.fill.JRFillSubreport.evaluate(JRFillSubreport.java:345)
    at net.sf.jasperreports.engine.fill.JRFillElementContainer.evaluate(JRFillElementContainer.java:258)
    at net.sf.jasperreports.engine.fill.JRFillBand.evaluate(JRFillBand.java:454)
    at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillColumnBand(JRVerticalFiller.java:2029)
    at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillDetail(JRVerticalFiller.java:755)
    at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReportStart(JRVerticalFiller.java:262)
    at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(JRVerticalFiller.java:122)
    at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:551)
    at net.sf.jasperreports.engine.fill.JRFillSubreport.fillSubreport(JRFillSubreport.java:736)
    at net.sf.jasperreports.engine.fill.JRSubreportRunnable.run(JRSubreportRunnable.java:58)
    at net.sf.jasperreports.engine.fill.AbstractThreadSubreportRunner.run(AbstractThreadSubreportRunner.java:216)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    ... 1 more
Caused by: java.lang.ClassCastException: net.sf.jasperreports.engine.fill.SortedDataSource cannot be cast to net.sf.jasperreports.engine.data.JsonDataSource
    at currency_1479490219429_385194.evaluate(currency_1479490219429_385194:195)
    at net.sf.jasperreports.engine.fill.JREvaluator.evaluate(JREvaluator.java:251)
    ... 19 more

我created a branch只针对这个问题。这is my json data source。

我还尝试了this suggestion，但是，我不知道如何获取我的数据源作为我子报表的参数，以及如何重新发送它。 ：（

任何想法或想法都会非常感激！

1 个答案:

答案 0 :(得分：0)

对于那些可能有同样问题的人。解决方案比我原先想象的要容易。根据我想要分组的字段，有必要仅创建第二个组。

    <?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.3.1.final using JasperReports Library version 6.3.1  -->
<!-- 2016-11-21T16:51:47 -->
<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="currency" pageWidth="515" pageHeight="742" columnWidth="515" leftMargin="0" rightMargin="0" topMargin="0" bottomMargin="0" uuid="bbe115b5-a5a0-4b39-9b73-7092dc59ab6d">
    <style name="Sans_Normal" isDefault="true" fontName="DejaVu Sans" fontSize="12" isBold="false" isItalic="false" isUnderline="false" isStrikeThrough="false"/>
    <style name="Sans_Normal_8" style="Sans_Normal" fontSize="8"/>
    <style name="Sans_Bold" fontName="DejaVu Sans" fontSize="12" isBold="true" isItalic="false" isUnderline="false" isStrikeThrough="false"/>
    <style name="Sans_Bold_8" style="Sans_Bold" fontSize="8"/>
    <queryString>
        <![CDATA[]]>
    </queryString>
    <field name="Currency" class="java.lang.String">
        <property name="net.sf.jasperreports.json.field.expression" value="Currency"/>
    </field>
    <field name="ShipCountry" class="java.lang.String">
        <property name="net.sf.jasperreports.json.field.expression" value="ShipCountry"/>
    </field>
    <field name="Id" class="java.lang.String">
        <property name="net.sf.jasperreports.json.field.expression" value="OrderID"/>
    </field>
    <field name="OrderDate" class="java.lang.String">
        <property name="net.sf.jasperreports.json.field.expression" value="OrderDate"/>
    </field>
    <field name="ShipCity" class="java.lang.String">
        <property name="net.sf.jasperreports.json.field.expression" value="ShipCity"/>
    </field>
    <field name="Freight" class="java.lang.Float">
        <property name="net.sf.jasperreports.json.field.expression" value="Freight"/>
    </field>
    <group name="CurrencyGroup" isReprintHeaderOnEachPage="true">
        <groupExpression><![CDATA[$F{Currency}]]></groupExpression>
        <groupHeader>
            <band height="26">
                <textField>
                    <reportElement style="Sans_Bold" x="5" y="6" width="124" height="15" isPrintWhenDetailOverflows="true" uuid="0aaeed6e-7ba1-4ab9-be59-d6ca702995fc"/>
                    <textElement>
                        <font size="10"/>
                    </textElement>
                    <textFieldExpression><![CDATA[$F{Currency}]]></textFieldExpression>
                </textField>
                <line>
                    <reportElement x="0" y="20" width="515" height="1" isPrintWhenDetailOverflows="true" uuid="6d76c22c-329f-4e77-a886-8580d3cb6bc1"/>
                </line>
                <line>
                    <reportElement x="1" y="6" width="515" height="1" isPrintWhenDetailOverflows="true" uuid="533d7e0a-969c-44c7-8114-eabe53fe2bde"/>
                </line>
            </band>
        </groupHeader>
    </group>
    <group name="ShipCountryGroup" isReprintHeaderOnEachPage="true">
        <groupExpression><![CDATA[$F{ShipCountry}]]></groupExpression>
        <groupHeader>
            <band height="20">
                <textField>
                    <reportElement style="Sans_Bold" x="22" y="3" width="124" height="15" isPrintWhenDetailOverflows="true" uuid="03b06cb9-2565-47fa-845a-9585c2dd2056"/>
                    <textElement>
                        <font size="10"/>
                    </textElement>
                    <textFieldExpression><![CDATA[$F{ShipCountry}]]></textFieldExpression>
                </textField>
            </band>
        </groupHeader>
    </group>
    <pageHeader>
        <band height="21">
            <staticText>
                <reportElement style="Sans_Bold" mode="Opaque" x="0" y="5" width="515" height="15" forecolor="#FFFFFF" backcolor="#333333" uuid="da0f1cad-f552-424b-bf19-b41cabbfa4ac"/>
                <text><![CDATA[Currency]]></text>
            </staticText>
        </band>
    </pageHeader>
    <detail>
        <band height="50">
            <textField>
                <reportElement style="Sans_Normal_8" x="0" y="2" width="51" height="10" uuid="ec54687d-3c95-4647-9db5-fa71a6e81009"/>
                <textElement textAlignment="Right"/>
                <textFieldExpression><![CDATA[$F{Id}]]></textFieldExpression>
            </textField>
            <textField isStretchWithOverflow="true" pattern="yyyy, MMM dd">
                <reportElement style="Sans_Normal_8" positionType="Float" x="54" y="2" width="87" height="10" uuid="a112ba7b-c321-467c-91ec-ffb513c23338"/>
                <textElement textAlignment="Center"/>
                <textFieldExpression><![CDATA[$F{OrderDate}]]></textFieldExpression>
            </textField>
            <textField isStretchWithOverflow="true">
                <reportElement style="Sans_Normal_8" positionType="Float" x="146" y="2" width="108" height="10" uuid="6a61edb3-239e-4791-a046-a6459343ac07"/>
                <textFieldExpression><![CDATA[$F{ShipCity}]]></textFieldExpression>
            </textField>
            <textField isStretchWithOverflow="true" pattern="¤ #,##0.00">
                <reportElement style="Sans_Normal_8" positionType="Float" x="259" y="2" width="92" height="10" uuid="61a8a117-6a43-46a7-9b96-10c5beb578ab"/>
                <textElement textAlignment="Right"/>
                <textFieldExpression><![CDATA[$F{Freight}]]></textFieldExpression>
            </textField>
        </band>
    </detail>
</jasperReport>

我已经created a branch获得了这个答案。我希望它有所帮助！ ：）

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