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使用 Java 數據源的帶有餅圖的 Jasper 報告創建為空白

[英]Jasper report with pie chart using Datasource from java is created blank

 原文  2017-01-31 06:04:38  6   1    java/ charts/ jasper-reports/ datasource

問題描述

我正在使用帶有餅圖的 Jasper Report 並使用 java 代碼推送數據。 這是我的java代碼

data1、data2、data3是Data.java的對象，有一些字段和值。

ArrayList<Data> selectedDataList = new ArrayList<Data>();
selectedDataList.add(data1);
selectedDataList.add(data2);
selectedDataList.add(data3);

      URL in = CampaignReport.class.getResource("Report.jrxml");
      // Compile jrxml file.
      JasperReport jasperReport = JasperCompileManager.compileReport(in.getPath());

      //Parameters for report
      Map<String, Object> parameters = new HashMap<String, Object>();

      // DataSource
      // This is simple example, no database.
      // then using empty datasource.
      JRDataSource dataSource = new JREmptyDataSource();
      JRBeanCollectionDataSource beanColDataSource = new JRBeanCollectionDataSource(selectedDataList);
      parameters.put("ItemDataSource", beanColDataSource);


      JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, beanColDataSource);
      // Make sure the output directory exists.
      File outDir = new File(folderUrl);
      outDir.mkdirs();

     JasperExportManager.exportReportToPdfFile(jasperPrint, fileName);

這是 Report.jrxml 的代碼

<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.3.1.final using JasperReports Library version 6.3.1  -->
<!-- 2017-01-30T17:53:54 -->
<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="template_Table" pageWidth="842" pageHeight="595" orientation="Landscape" whenNoDataType="NoPages" columnWidth="802" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="1a0aa80b-dc07-4dca-bdbc-aa78eeb0d12b">
    <property name="com.jaspersoft.studio.data.defaultdataadapter" value="One Empty Record"/>
    <property name="com.jaspersoft.studio.unit." value="pixel"/>
    <style name="Row" mode="Transparent" fontName="Calibri" pdfFontName="Times-Roman">
        <conditionalStyle>
            <conditionExpression><![CDATA[$V{REPORT_COUNT}%2 == 0]]></conditionExpression>
            <style mode="Opaque" backcolor="#F0EFEF"/>
        </conditionalStyle>
    </style>
    <style name="Table 1_TH" mode="Opaque" backcolor="#D0EBF7">
        <box>
            <pen lineWidth="0.5" lineColor="#FFFFFF"/>
            <topPen lineWidth="0.5" lineColor="#FFFFFF"/>
            <leftPen lineWidth="0.5" lineColor="#FFFFFF"/>
            <bottomPen lineWidth="0.5" lineColor="#FFFFFF"/>
            <rightPen lineWidth="0.5" lineColor="#FFFFFF"/>
        </box>
    </style>
    <style name="Table 1_CH" mode="Opaque" backcolor="#FAFCFE">
        <box>
            <pen lineWidth="0.5" lineColor="#FFFFFF"/>
            <topPen lineWidth="0.5" lineColor="#FFFFFF"/>
            <leftPen lineWidth="0.5" lineColor="#FFFFFF"/>
            <bottomPen lineWidth="0.5" lineColor="#FFFFFF"/>
            <rightPen lineWidth="0.5" lineColor="#FFFFFF"/>
        </box>
    </style>
    <style name="Table 1_TD" mode="Opaque" backcolor="#FAFCFE">
        <box>
            <pen lineWidth="0.5" lineColor="#FFFFFF"/>
            <topPen lineWidth="0.5" lineColor="#FFFFFF"/>
            <leftPen lineWidth="0.5" lineColor="#FFFFFF"/>
            <bottomPen lineWidth="0.5" lineColor="#FFFFFF"/>
            <rightPen lineWidth="0.5" lineColor="#FFFFFF"/>
        </box>
        <conditionalStyle>
            <conditionExpression><![CDATA[new Boolean($V{REPORT_COUNT}.intValue()%2==0)]]></conditionExpression>
            <style backcolor="#D5E3E2"/>
        </conditionalStyle>
    </style>
    <subDataset name="Dataset1" uuid="7a7c32a6-b47a-4839-afad-3aeaed61363e">
        <queryString>
            <![CDATA[]]>
        </queryString>
        <field name="subject" class="java.lang.String"/>
        <field name="marks" class="java.lang.Integer"/>
    </subDataset>
    <parameter name="ItemDataSource" class="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource"/>
    <field name="subject" class="java.lang.String"/>
    <field name="marks" class="java.lang.Integer"/>
    <group name="Group1">
        <groupExpression><![CDATA[(int)($V{REPORT_COUNT}/15)]]></groupExpression>
    </group>
    <group name="Group2">
        <groupExpression><![CDATA[(int)($V{REPORT_COUNT}/5)]]></groupExpression>
    </group>
    <pageHeader>
        <band splitType="Stretch"/>
    </pageHeader>
    <detail>
        <band height="120" splitType="Stretch">
            <property name="com.jaspersoft.studio.layout" value="com.jaspersoft.studio.editor.layout.FreeLayout"/>
            <componentElement>
                <reportElement stretchType="RelativeToTallestObject" mode="Transparent" x="0" y="0" width="800" height="120" forecolor="#FFFFFF" backcolor="#424242" uuid="7786bb05-503a-4b6a-991a-a7bcf3abad07">
                    <property name="com.jaspersoft.studio.layout" value="com.jaspersoft.studio.editor.layout.grid.JSSGridBagLayout"/>
                    <property name="com.jaspersoft.studio.table.style.table_header" value="Table 1_TH"/>
                    <property name="com.jaspersoft.studio.table.style.column_header" value="Table 1_CH"/>
                    <property name="com.jaspersoft.studio.table.style.detail" value="Table 1_TD"/>
                    <property name="net.sf.jasperreports.export.headertoolbar.table.name" value=""/>
                    <property name="com.jaspersoft.studio.components.autoresize.proportional" value="true"/>
                    <property name="com.jaspersoft.studio.components.autoresize.next" 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">
                    <datasetRun subDataset="Dataset1" uuid="d3e1e03a-2c83-4436-9e50-79518bc3d337">
                        <dataSourceExpression><![CDATA[$P{ItemDataSource}]]></dataSourceExpression>
                    </datasetRun>
                    <jr:column width="52" uuid="dca8961f-ce2d-47ac-879c-b15847d170a9">
                        <property name="com.jaspersoft.studio.components.table.model.column.name" value="Column1"/>
                        <property name="com.jaspersoft.studio.unit.height" value="pixel"/>
                        <property name="com.jaspersoft.studio.unit.width" value="pixel"/>
                        <jr:tableHeader style="Table 1_TH" height="70">
                            <property name="com.jaspersoft.studio.layout" value="com.jaspersoft.studio.editor.layout.VerticalRowLayout"/>
                            <property name="com.jaspersoft.studio.unit.height" value="px"/>
                            <property name="com.jaspersoft.studio.unit.width" value="px"/>
                            <staticText>
                                <reportElement x="0" y="0" width="52" height="70" uuid="f60d1675-6fb6-4569-93ca-de32b3a8e861"/>
                                <box leftPadding="3"/>
                                <textElement textAlignment="Left" verticalAlignment="Middle" markup="html">
                                    <font fontName="Verdana" size="9"/>
                                </textElement>
                                <text><![CDATA[Subject]]></text>
                            </staticText>
                        </jr:tableHeader>
                        <jr:detailCell style="Table 1_TD" height="50">
                            <property name="com.jaspersoft.studio.layout" value="com.jaspersoft.studio.editor.layout.VerticalRowLayout"/>
                            <property name="com.jaspersoft.studio.unit.height" value="px"/>
                            <property name="com.jaspersoft.studio.unit.width" value="px"/>
                            <textField>
                                <reportElement x="0" y="0" width="52" height="50" uuid="f1de366a-b36f-4200-9b1e-7a0009be5373"/>
                                <box leftPadding="6"/>
                                <textElement textAlignment="Left" verticalAlignment="Middle">
                                    <font fontName="Verdana"/>
                                </textElement>
                                <textFieldExpression><![CDATA[$F{subject}]]></textFieldExpression>
                            </textField>
                        </jr:detailCell>
                    </jr:column>

                    <jr:column width="53" uuid="dca8961f-ce2d-47ac-879c-b15847d170a9">
                        <property name="com.jaspersoft.studio.components.table.model.column.name" value="Column1"/>
                        <jr:tableHeader style="Table 1_TH" height="70">
                            <property name="com.jaspersoft.studio.layout" value="com.jaspersoft.studio.editor.layout.FreeLayout"/>
                            <property name="com.jaspersoft.studio.unit.height" value="px"/>
                            <property name="com.jaspersoft.studio.unit.width" value="px"/>
                            <staticText>
                                <reportElement x="0" y="0" width="53" height="70" uuid="f60d1675-6fb6-4569-93ca-de32b3a8e861"/>
                                <box leftPadding="3"/>
                                <textElement textAlignment="Left" verticalAlignment="Middle" markup="html">
                                    <font fontName="Verdana" size="9"/>
                                </textElement>
                                <text><![CDATA[Marks]]></text>
                            </staticText>
                        </jr:tableHeader>
                        <jr:detailCell style="Table 1_TD" height="50">
                            <property name="com.jaspersoft.studio.layout" value="com.jaspersoft.studio.editor.layout.VerticalRowLayout"/>
                            <property name="com.jaspersoft.studio.unit.height" value="px"/>
                            <property name="com.jaspersoft.studio.unit.width" value="px"/>
                            <textField>
                                <reportElement x="0" y="0" width="53" height="50" uuid="f1de366a-b36f-4200-9b1e-7a0009be5373"/>
                                <textElement textAlignment="Center" verticalAlignment="Middle"/>
                                <textFieldExpression><![CDATA[$F{marks}]]></textFieldExpression>
                            </textField>
                        </jr:detailCell>
                    </jr:column>

                </jr:table>
            </componentElement>
        </band>
    </detail>
    <summary>
        <band height="440" splitType="Stretch">
            <pieChart>
                <chart evaluationTime="Report">
                    <reportElement x="10" y="40" width="270" height="300" uuid="08e2ac0f-0059-4037-b77e-521d78434987"/>
                    <chartTitle>
                        <titleExpression><![CDATA["My First JR Pie Chart"]]></titleExpression>
                    </chartTitle>
                    <chartSubtitle/>
                    <chartLegend/>
                </chart>
                <pieDataset>
                    <keyExpression><![CDATA[$F{subject}]]></keyExpression>
                    <valueExpression><![CDATA[$F{marks}]]></valueExpression>
                </pieDataset>
                <piePlot>
                    <plot/>
                    <itemLabel/>
                </piePlot>
            </pieChart>
        </band>
    </summary>
</jasperReport>

使用這些代碼圖表是用數據創建的，但報告（表格）是空白的不顯示數據。

我該怎么辦 ？ 是不是代碼有問題。

1 個解決方案

解決方案1
 1 已采納  

數據源存在問題，您對表和圖表等實體使用相同的數據源。

因此，創建兩個不同的數據源。

JRBeanCollectionDataSource beanColDataSource = new JRBeanCollectionDataSource(selectedDataList);
      parameters.put("ItemDataSource", beanColDataSource);

JRBeanCollectionDataSource chartColDataSource = new JRBeanCollectionDataSource(selectedDataList);

      JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, chartColDataSource);

這是您將值傳遞給 jrmxl 的方式。 現在兩者都可以正確訪問數據，即圖表和表格。

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