我在 iReports 中构建图表，当我在 Eclipse 中编译时出现以下错误：
net.sf.jasperreports.engine.JRException: Errors were encountered when compiling report expressions class file:
1. net.sf.jasperreports.engine.JRBeanCollectionDataSource cannot be resolved to a type
value = new net.sf.jasperreports.engine.JRBeanCollectionDataSource(((java.lang.String)field_chartData46xAxis.getValue())); //$JR_EXPR_ID=11$
<---------------------------------------------------->
2. net.sf.jasperreports.engine.JRBeanCollectionDataSource cannot be resolved to a type
value = new net.sf.jasperreports.engine.JRBeanCollectionDataSource(((java.lang.String)field_chartData46xAxis.getOldValue())); //$JR_EXPR_ID=11$
<---------------------------------------------------->
3. net.sf.jasperreports.engine.JRBeanCollectionDataSource cannot be resolved to a type
value = new net.sf.jasperreports.engine.JRBeanCollectionDataSource(((java.lang.String)field_chartData46xAxis.getValue())); //$JR_EXPR_ID=11$
<---------------------------------------------------->3 errors
at net.sf.jasperreports.engine.design.JRAbstractCompiler.compileReport(JRAbstractCompiler.java:204)
at net.sf.jasperreports.engine.JasperCompileManager.compile(JasperCompileManager.java:240)
at net.sf.jasperreports.engine.JasperCompileManager.compile(JasperCompileManager.java:173)
at net.sf.jasperreports.engine.JasperCompileManager.compileReport(JasperCompileManager.java:448)
at org.reportprotojava.protosheet.Program.main(Program.java:122)
我将 ProtoReport 的ArrayList （我现在测试时只有一个）传递给 jasper 编译器。ProtoReport类包含一个ChartData类，该类又具有两个Double 类型的ArrayList，一个用于 X 轴，一个用于 Y 轴。ProtoReport、ChartData类和主程序的
定义如下（略删）：
原型报告类：
package org.reportprotojava.protosheet;
import java.util.ArrayList;
public class ProtoReport {
private String outputFileName;
private String title;
private String logoLocation;
private String paragraphText;
private ArrayList<String> tableData;
private String picLocation;
private int[][] graphData; //TODO decide how to store chart data
private ChartData chartData;
private String path;
//default constructor
public ProtoReport() {
// Initialize object fields
outputFileName = "PrototypeReport";
title = "Prototype Report";
paragraphText = "Default text";
tableData = new ArrayList<String>();
chartData = new ChartData();
//set path to working directory
path = System.getProperty("user.dir");
//default to assumed report location
//(ie same folder as .jrxml and .jasper files)
logoLocation = path + "\\reports\\logo.jpg";
picLocation = path + "\\reports\\pic.jpg";
}
图表数据类：
package org.reportprotojava.protosheet;
import java.util.ArrayList;
public class ChartData {
private ArrayList<Double> xAxis;
private ArrayList<Double> yAxis;
/**
* @param xAxis
* @param yAxis
*/
//default constructor
public ChartData(){
xAxis = new ArrayList<Double>();
yAxis = new ArrayList<Double>();
}
//constructor
public ChartData(ArrayList<Double> xAxis, ArrayList<Double> yAxis) {
super();
this.xAxis = xAxis;
this.yAxis = yAxis;
}
主程序
public class Program {
/**
* @param args
*
*Program runs our ProtoReport class and its supporting classes
* In the end we will have generated a .pdf from the
* previously defined .jrxml file
*/
//Generate some random data for the chart
public static ArrayList<Double> randomData(int size) {
ArrayList<Double> arrayList = new ArrayList<Double>();
double randNumber;
for (int i = 0; i < size; i++) {
randNumber = Math.random();
arrayList.add(randNumber);
}
return arrayList;
}
public static void main(String[] args) {
ArrayList<ProtoReport> listOfReports = new ArrayList<ProtoReport>();
ProtoReport protoReport1 = new ProtoReport();
ProtoReport protoReport2 = new ProtoReport();
//Simple Fields and text
protoReport1.setTitle("Example<br/>Fact Sheet");
protoReport1.setLogoLocation(protoReport1.getPath() + "\\reports\\logo.gif");
ChartData chartData = new ChartData();
chartData.setYAxis(randomData(20));
for (Double i = (double) 0; i < chartData.getYAxis().size(); i++) {
chartData.getXAxis().add(i);
}
protoReport1.setChartData(chartData);
String jrxmlLocation = protoReport1.getPath()
+ "\\reports\\ReportPrototype.jrxml";
String outputFileName = protoReport1.getPath()
+ "\\reports\\generated\\" + protoReport1.getOutputFileName() + ".pdf";
listOfReports.add(protoReport1);
//and wrap the ArrayList in a JRBeanCollectionDataSource
JRBeanCollectionDataSource beanBurritoWrap = new JRBeanCollectionDataSource(listOfReports);
//build the jasper report
JasperReport jasperReport;
JasperPrint jasperPrint;
HashMap<String, Object> hashMap = new HashMap<>();
boolean reportCreated;
try {
jasperReport = JasperCompileManager.compileReport(jrxmlLocation);
jasperPrint = JasperFillManager.fillReport(jasperReport, hashMap, beanBurritoWrap);
JasperExportManager.exportReportToPdfFile(jasperPrint, outputFileName);
reportCreated=true;
}
catch (JRException e) {
e.printStackTrace();
reportCreated=false;
}
}
我已经用谷歌搜索了这个问题并提出了这个和这个，并阅读了jasper sourceforge 上的数据源部分，但这些都没有帮助解决这个问题，我确定我已经使用过
new net.sf.jasperreports.engine.JRBeanCollectionDataSource($F{chartData.xAxis})
在我的图表数据源表达式中（并在我更改字段名称时更新它）并且字段设置为 iReport 属性中的列表类型。
这是我的.jrxml
<?xml version="1.0" encoding="UTF-8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="ReportPrototype.jrxml" pageWidth="595" pageHeight="842" columnWidth="495" leftMargin="57" rightMargin="43" topMargin="43" bottomMargin="43" uuid="10825c57-f953-4166-bf03-8ecabe8a8f47">
<property name="ireport.zoom" value="0.75"/>
<property name="ireport.x" value="0"/>
<property name="ireport.y" value="232"/>
<subDataset name="ChartData" uuid="fc9ec0af-3e1a-40a7-8eb4-9ad30a266dee">
<field name="chartData.xAxis" class="java.lang.String"/>
</subDataset>
<queryString language="SQL">
<![CDATA[]]>
</queryString>
<field name="title" class="java.lang.String"/>
<field name="logoLocation" class="java.lang.String"/>
<field name="picLocation" class="java.lang.String"/>
<field name="chartData.xAxis" class="java.lang.String"/>
<detail>
<band height="740" splitType="Stretch">
<textField isStretchWithOverflow="true" pattern="">
<reportElement uuid="519c6bb5-72f9-4c25-8e91-47865ae0c9df" mode="Opaque" x="39" y="75" width="378" height="45" forecolor="#000099"/>
<textElement textAlignment="Center" verticalAlignment="Middle" markup="html">
<font size="26"/>
</textElement>
<textFieldExpression><![CDATA[$F{title}]]></textFieldExpression>
</textField>
<image onErrorType="Icon">
<reportElement uuid="3759a707-32a4-49ef-a9c6-b0ad7136f738" x="216" y="264" width="279" height="246"/>
<imageExpression><![CDATA[$F{picLocation}]]></imageExpression>
</image>
<image onErrorType="Icon">
<reportElement uuid="f989f871-32ea-4f13-ae3f-3f487cde76dd" x="295" y="0" width="200" height="42"/>
<imageExpression><![CDATA[$F{logoLocation}]]></imageExpression>
</image>
<xyLineChart>
<chart>
<reportElement uuid="ae87fc13-b92e-4a2a-b218-d395343f6028" x="0" y="537" width="495" height="203"/>
<chartTitle/>
<chartSubtitle/>
<chartLegend/>
</chart>
<xyDataset>
<dataset>
<datasetRun subDataset="ChartData" uuid="de7fb84d-17ea-4e5e-82bf-2015e72e4982">
<dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.JRBeanCollectionDataSource($F{chartData.xAxis})]]></dataSourceExpression>
</datasetRun>
</dataset>
</xyDataset>
<linePlot>
<plot/>
</linePlot>
</xyLineChart>
</band>
</detail>
<pageFooter>
<band height="16">
<break>
<reportElement uuid="0d30dea4-a6af-4e41-b7be-c288f3188dbf" x="0" y="11" width="100" height="1"/>
</break>
</band>
</pageFooter>
在我尝试过的 iReports 中： -在字段下
创建和命名字段ProtoReport.ChartData.xAxis和ProtoReport.ChartData.yAxis以及我添加的ChartData源下的字段-将字段重命名
为ChartData.xAxis和ChartData.yAxis
-重
命名字段到chartData.xAxis和chartData.yAxis
- 仅
使用 Field 下的字段- 仅
使用 ChartData 下的字段 - Fields
都给我一个错误。任何想法我做错了什么？
其他问题：
-就目前而言，我的图表可能只会产生 xAxis 数据点。如何将一个ArrayList的内容用于 X 轴，另一个用于 Y 轴？即我在ChartData对象中的xAxis和yAxis字段。
-我在main之前声明的 randomData() 方法在我声明它为static之前不会运行，这是为什么呢？
编辑
更清楚地说明我的问题：如何命名我的字段、设置我的数据源和配置我的数据集以解决这个问题？
我正在关注评论中列出的教程（对不起非超链接；作为一个新用户，我已经使用了我所有的超链接），并根据我的需要对其进行了更改，但他的数据结构比我的更简单我想学习如何处理 jasper 报告中更复杂的对象和数据集。