通过从JavaBean传递值来生成报告及其子报表
我正在使用 iReport 和 JasperReports 通过传递来自 JavaBean 类
的值来生成报告和子报告运行文件时出现以下错误
net.sf.jasperreports.engine.JRException: Could not load object from location : nullemailReport.jasper
at net.sf.jasperreports.engine.util.JRLoader.loadObjectFromLocation(JRLoader.java:267)
at net.sf.jasperreports.engine.fill.JRFillSubreport.evaluateSubreport(JRFillSubreport.java:310)
at net.sf.jasperreports.engine.fill.JRFillSubreport.evaluate(JRFillSubreport.java:259)
at net.sf.jasperreports.engine.fill.JRFillElementContainer.evaluate(JRFillElementContainer.java:275)
at net.sf.jasperreports.engine.fill.JRFillBand.evaluate(JRFillBand.java:426)
at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillColumnBand(JRVerticalFiller.java:1380)
at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillDetail(JRVerticalFiller.java:692)
at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReportStart(JRVerticalFiller.java:255)
at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(JRVerticalFiller.java:113)
at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:879)
at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:801)
at net.sf.jasperreports.engine.fill.JRFiller.fillReport(JRFiller.java:89)
at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:601)
at com.f1soft.exportpdf.exportpdf.ExportUser.setAttachment(ExportUser.java:58)
at com.f1soft.exportpdf.exportpdf.ExportUser.main(ExportUser.java:119)
我的.jrxml报告代码是这样的
<?xml version="1.0" encoding="UTF-8" ?>
<!-- Created with iReport - A designer for JasperReports -->
<!DOCTYPE jasperReport PUBLIC "//JasperReports//DTD Report Design//EN" "http://jasperreports.sourceforge.net/dtds/jasperreport.dtd">
<jasperReport
name="userReport"
columnCount="1"
printOrder="Vertical"
orientation="Portrait"
pageWidth="595"
pageHeight="842"
columnWidth="535"
columnSpacing="0"
leftMargin="30"
rightMargin="30"
topMargin="20"
bottomMargin="20"
whenNoDataType="NoPages"
isFloatColumnFooter="true"
isTitleNewPage="true"
isSummaryNewPage="true"
isIgnorePagination="true">
<property name="ireport.scriptlethandling" value="0" />
<property name="ireport.encoding" value="UTF-8" />
<import value="java.util.*" />
<import value="net.sf.jasperreports.engine.*" />
<import value="net.sf.jasperreports.engine.data.*" />
<parameter name="imgLogoimgLogoimgLogo" isForPrompting="false" class="java.lang.String"/>
<parameter name="SUBREPORT_DIR" isForPrompting="false" class="net.sf.jasperreports.engine.JasperReport"/>
<field name="id" class="java.lang.Integer"/>
<field name="name" class="java.lang.String"/>
<field name="city" class="java.lang.String"/>
<background>
<band height="10" isSplitAllowed="true" >
</band>
</background>
<title>
<band height="11" isSplitAllowed="true" >
</band>
</title>
<pageHeader>
<band height="41" isSplitAllowed="true" >
<image evaluationTime="Now" hyperlinkType="None" hyperlinkTarget="Self" >
<reportElement
x="4"
y="4"
width="114"
height="34"
key="image-1"/>
<box></box>
<graphicElement stretchType="NoStretch"/>
<imageExpression class="java.lang.String"><![CDATA[]]></imageExpression>
</image>
</band>
</pageHeader>
<columnHeader>
<band height="10" isSplitAllowed="true" >
</band>
</columnHeader>
<detail>
<band height="130" isSplitAllowed="true" >
<rectangle>
<reportElement
x="4"
y="4"
width="455"
height="24"
backcolor="#990000"
key="rectangle-1"/>
<graphicElement stretchType="NoStretch"/>
</rectangle>
<staticText>
<reportElement
x="9"
y="7"
width="41"
height="17"
forecolor="#FFFFFF"
key="staticText-1"/>
<box></box>
<textElement verticalAlignment="Middle">
<font size="12"/>
</textElement>
<text><![CDATA[ID]]></text>
</staticText>
<staticText>
<reportElement
x="57"
y="7"
width="114"
height="17"
forecolor="#FFFFFF"
key="staticText-2"/>
<box></box>
<textElement verticalAlignment="Middle">
<font size="12"/>
</textElement>
<text><![CDATA[Name]]></text>
</staticText>
<staticText>
<reportElement
x="179"
y="7"
width="114"
height="17"
forecolor="#FFFFFF"
key="staticText-3"/>
<box></box>
<textElement verticalAlignment="Middle">
<font size="12"/>
</textElement>
<text><![CDATA[City]]></text>
</staticText>
<textField isStretchWithOverflow="false" isBlankWhenNull="false" evaluationTime="Now" hyperlinkType="None" hyperlinkTarget="Self" >
<reportElement
x="9"
y="31"
width="41"
height="15"
key="textField-1"/>
<box></box>
<textElement>
<font/>
</textElement>
<textFieldExpression class="java.lang.Integer"><![CDATA[$F{id}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="false" isBlankWhenNull="false" evaluationTime="Now" hyperlinkType="None" hyperlinkTarget="Self" >
<reportElement
x="57"
y="31"
width="114"
height="15"
key="textField-2"/>
<box></box>
<textElement>
<font/>
</textElement>
<textFieldExpression class="java.lang.String"><![CDATA[$F{name}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="false" isBlankWhenNull="false" evaluationTime="Now" hyperlinkType="None" hyperlinkTarget="Self" >
<reportElement
x="179"
y="31"
width="114"
height="15"
key="textField-3"/>
<box></box>
<textElement>
<font/>
</textElement>
<textFieldExpression class="java.lang.String"><![CDATA[$F{city}]]></textFieldExpression>
</textField>
<line direction="TopDown">
<reportElement
x="4"
y="114"
width="516"
height="0"
backcolor="#0000CC"
key="line-1"/>
<graphicElement stretchType="NoStretch"/>
</line>
<subreport isUsingCache="true">
<reportElement
x="4"
y="56"
width="381"
height="43"
key="subreport-1"/>
<subreportParameter name="userid">
<subreportParameterExpression><![CDATA[$F{id}]]></subreportParameterExpression>
</subreportParameter>
<connectionExpression><![CDATA[$P{REPORT_CONNECTION}]]></connectionExpression>
<subreportExpression class="java.lang.String"><![CDATA[$P{SUBREPORT_DIR} + "emailReport.jasper"]]></subreportExpression>
</subreport>
</band>
</detail>
</jasperReport>
我的.jrxml SUB报告代码是这样的
<?xml version="1.0" encoding="UTF-8" ?>
<!-- Created with iReport - A designer for JasperReports -->
<!DOCTYPE jasperReport PUBLIC "//JasperReports//DTD Report Design//EN" "http://jasperreports.sourceforge.net/dtds/jasperreport.dtd">
<jasperReport
name="emailReport"
columnCount="1"
printOrder="Vertical"
orientation="Portrait"
pageWidth="595"
pageHeight="842"
columnWidth="595"
columnSpacing="0"
leftMargin="0"
rightMargin="0"
topMargin="0"
bottomMargin="0"
whenNoDataType="NoPages"
isTitleNewPage="false"
isSummaryNewPage="false">
<property name="ireport.scriptlethandling" value="2" />
<property name="ireport.encoding" value="UTF-8" />
<import value="java.util.*" />
<import value="net.sf.jasperreports.engine.*" />
<import value="net.sf.jasperreports.engine.data.*" />
<parameter name="userid" isForPrompting="true" class="java.lang.Integer"/>
<field name="id" class="java.lang.Integer"/>
<field name="userid" class="java.lang.String"/>
<field name="email" class="java.lang.String"/>
<background>
<band height="0" isSplitAllowed="true" >
</band>
</background>
<title>
<band height="9" isSplitAllowed="true" >
</band>
</title>
<pageHeader>
<band height="8" isSplitAllowed="true" >
</band>
</pageHeader>
<columnHeader>
<band height="7" isSplitAllowed="true" >
</band>
</columnHeader>
<detail>
<band height="57" isSplitAllowed="true" >
<rectangle>
<reportElement
x="5"
y="12"
width="455"
height="24"
backcolor="#FF9999"
key="rectangle-1"/>
<graphicElement stretchType="NoStretch"/>
</rectangle>
<staticText>
<reportElement
x="10"
y="15"
width="41"
height="17"
forecolor="#000000"
key="staticText-1"/>
<box></box>
<textElement verticalAlignment="Middle">
<font size="12"/>
</textElement>
<text><![CDATA[ID]]></text>
</staticText>
<staticText>
<reportElement
x="58"
y="15"
width="114"
height="17"
forecolor="#000000"
key="staticText-2"/>
<box></box>
<textElement verticalAlignment="Middle">
<font size="12"/>
</textElement>
<text><![CDATA[User id]]></text>
</staticText>
<staticText>
<reportElement
x="180"
y="15"
width="114"
height="17"
forecolor="#000000"
key="staticText-3"/>
<box></box>
<textElement verticalAlignment="Middle">
<font size="12"/>
</textElement>
<text><![CDATA[Email]]></text>
</staticText>
<textField isStretchWithOverflow="false" isBlankWhenNull="false" evaluationTime="Now" hyperlinkType="None" hyperlinkTarget="Self" >
<reportElement
x="10"
y="39"
width="41"
height="15"
key="textField-1"/>
<box></box>
<textElement>
<font/>
</textElement>
<textFieldExpression class="java.lang.Integer"><![CDATA[$F{id}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="false" isBlankWhenNull="false" evaluationTime="Now" hyperlinkType="None" hyperlinkTarget="Self" >
<reportElement
x="58"
y="39"
width="114"
height="15"
key="textField-2"/>
<box></box>
<textElement>
<font/>
</textElement>
<textFieldExpression class="java.lang.String"><![CDATA[$F{userid}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="false" isBlankWhenNull="false" evaluationTime="Now" hyperlinkType="None" hyperlinkTarget="Self" >
<reportElement
x="180"
y="39"
width="114"
height="15"
key="textField-3"/>
<box></box>
<textElement>
<font/>
</textElement>
<textFieldExpression class="java.lang.String"><![CDATA[$F{email}]]></textFieldExpression>
</textField>
</band>
</detail>
</jasperReport>
----------
我创建了三个 Java 类 的 UserFormatDTO.java
import java.io.Serializable;
import java.util.List;
public class UserFormatDTO implements Serializable {
private int id;
private String name;
private String city;
private List<UserEmailDTO> emailList;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public List<UserEmailDTO> getEmailList() {
return emailList;
}
public void setEmailList(List<UserEmailDTO> emailList) {
this.emailList = emailList;
}
@Override
public String toString() {
return "UserFormatDTO{" + "id=" + id + ", name=" + name + ", city=" + city + '}';
}
}
UserEmailDTO.java
import java.io.Serializable;
public class UserEmailDTO implements Serializable {
private int id;
private int userid;
private String email;
public int getUserid() {
return userid;
}
public void setUserid(int userid) {
this.userid = userid;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Override
public String toString() {
return "UserEmailDTO{" + "id=" + id + ", userid=" + userid + ", email=" + email + '}';
}
}
ExportUser.java
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import net.sf.jasperreports.engine.JRDataSource;
import net.sf.jasperreports.engine.JRExporter;
import net.sf.jasperreports.engine.JRExporterParameter;
import net.sf.jasperreports.engine.JasperCompileManager;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JasperReport;
import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;
import net.sf.jasperreports.engine.export.JRPdfExporter;
public class ExportUser {
private static void setAttachment(String fileName, HashMap hashMap, List<UserFormatDTO> record) {
String jrxmlReportPath = "Statements/" + fileName + ".jrxml";
String imgLogo = "img/brand.png";
hashMap.put("imgLogo", imgLogo);
byte[] setAttachmentContent = null;
try {
JasperReport jasperReport1 = JasperCompileManager.compileReport(jrxmlReportPath);
JRBeanCollectionDataSource beanDataSource1 = new JRBeanCollectionDataSource(record, true);
JRDataSource jrDatasource1 = (JRDataSource) beanDataSource1;
System.out.println("```````````Generating Report``````````");
// hashMap.put("SUBREPORT_DIR", "Statements/");
JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport1, hashMap, jrDatasource1);
String outFileNamePDF = "UserDetails.pdf";
JRExporter exporter1 = new JRPdfExporter();
exporter1.setParameter(JRExporterParameter.OUTPUT_FILE_NAME, outFileNamePDF);
exporter1.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
exporter1.exportReport();
System.out.println("Created file: " + outFileNamePDF);
System.out.println("Done!");
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
try {
List<UserFormatDTO> userFormatDTOs = new ArrayList<UserFormatDTO>();
List<UserEmailDTO> userEmailDTOs = new ArrayList<UserEmailDTO>();
UserFormatDTO userFormatDTO1 = new UserFormatDTO();
userFormatDTO1.setId('1');
userFormatDTO1.setName("Ram");
userFormatDTO1.setCity("Pokhara");
UserEmailDTO userEmailDTO1 = new UserEmailDTO();
userEmailDTO1.setUserid('1');
userEmailDTO1.setEmail("firstUser@firstMail");
userEmailDTOs.add(userEmailDTO1);
UserEmailDTO userEmailDTO1a = new UserEmailDTO();
userEmailDTO1a.setId('2');
userEmailDTO1a.setUserid('1');
userEmailDTO1a.setEmail("firstUser@secondMail");
userEmailDTOs.add(userEmailDTO1a);
userFormatDTO1.setEmailList(userEmailDTOs);
userFormatDTOs.add(userFormatDTO1);
UserFormatDTO userFormatDTO2 = new UserFormatDTO();
userFormatDTO2.setId('2');
userFormatDTO2.setName("Shyam");
userFormatDTO2.setCity("Kathmandu");
userEmailDTOs = new ArrayList<UserEmailDTO>();
UserEmailDTO userEmailDTO2 = new UserEmailDTO();
userEmailDTO2.setId('3');
userEmailDTO2.setUserid('2');
userEmailDTO2.setEmail("secondUser@firstMail");
userEmailDTOs.add(userEmailDTO2);
userFormatDTO2.setEmailList(userEmailDTOs);
userFormatDTOs.add(userFormatDTO2);
setAttachment("userReport", new HashMap(), userFormatDTOs);
} catch (Exception e) {
e.printStackTrace();
}
}
}
为什么我会收到错误？
2 个答案:
答案 0 :(得分：0)
您需要将参数作为String类型传递。
更改子报表参数属性
答案 1 :(得分：0)
如果你仔细研究这个例外：
net.sf.jasperreports.engine.JRException: Could not load object from location : nullemailReport.jasper
您将在子报告emailReport.jasper的名称前面看到null。
查看你的jrxml
<subreportExpression class="java.lang.String"><![CDATA[$P{SUBREPORT_DIR} + "emailReport.jasper"]]></subreportExpression>
出现null，因为未设置参数SUBREPORT_DIR，它为空。
此参数需要传递到主报告中才能找到子报告。建议对此参数使用绝对路径而不是相对路径。
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