java – net.sf.jasperreports.engine.JRException：从bean中检索字段值时出错：First_name
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我想用Jasper Reports创建CSV.有很多相关的问题,但没有什么对我有用.下面是我的bean类：
public class DataBean {
public String First_name;
public String Last_name;
public String Designation;
public String Department;
public void setfirstName(String First_name) {
this.First_name = First_name;
}
public String getfirstName() {
return First_name;
}
public void setLastName(String Last_name) {
this.Last_name = Last_name;
}
public String getlastName() {
return Last_name;
}
public void setdesignation(String Designation) {
this.Designation = Designation;
}
public String getdesignation() {
return Designation;
}
public void setDepartment(String Department) {
this.Department = Department;
}
public String getDepartment() {
return Department;
}
}
下面是从数据库获取数据并使用Jasper Report生成CSV的类：
import java.util.HashMap;
import java.util.Map;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.ArrayList;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperCompileManager;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;
import net.sf.jasperreports.engine.design.JasperDesign;
import net.sf.jasperreports.engine.export.JRCsvExporter;
import net.sf.jasperreports.engine.export.JRCsvExporterParameter;
import net.sf.jasperreports.engine.xml.JRXmlLoader;
import com.mysql.jdbc.PreparedStatement;
public class GetResult
{
PreparedStatement pst=null;
DBConnection dbcon=null;
String First_name;
String Last_name;
String Designation;
String Department;
net.sf.jasperreports.engine.JasperReport report = null;
JasperDesign design = null;
JasperPrint print = null;
InputStream input = null;
public void result(){
try{
dbcon=new DBConnection();
input = new FileInputStream(new File("C:/Users/adiuser1/report2.jrxml"));//report2.jasper
design = JRXmlLoader.load(input);
ArrayList<DataBean> al2=new ArrayList<DataBean>();
Map<String, Object> parameters = new HashMap<String, Object>();
pst = (PreparedStatement) dbcon.conn.prepareStatement("SELECT First_name, Last_name, Designation, Department FROM emp_data");
java.sql.ResultSet rs=pst.executeQuery();
parameters.put("First_name","First_name");
parameters.put("Last_name","Last_name");
parameters.put("Designation","Designation");
parameters.put("Department","Department");
while(rs.next())
{
DataBean db=new DataBean();
First_name = rs.getString("First_name");
db.setfirstName(First_name);
Last_name = rs.getString("Last_name");
db.setLastName(Last_name);
Designation = rs.getString("Designation");
db.setdesignation(Designation);
Department = rs.getString("Department");
db.setDepartment(Department);
al2.add(db);
}
System.out.println("size: "+parameters.size());
System.out.println("size: "+al2.size());
report = JasperCompileManager.compileReport(design);
JRBeanCollectionDataSource masterDS = null;
masterDS = new JRBeanCollectionDataSource(al2,false);
print = JasperFillManager.fillReport(report, parameters, masterDS);
JRCsvExporter csvExporter = new JRCsvExporter();
csvExporter.setParameter(JRCsvExporterParameter.JASPER_PRINT, print);
csvExporter.setParameter(JRCsvExporterParameter.OUTPUT_FILE_NAME, "X:/abc.csv");
csvExporter.setParameter(JRCsvExporterParameter.CHARACTER_ENCODING, "ISO-8859-1");
csvExporter.exportReport();
}
catch(JRException jrException)
{
System.out.print(jrException);
jrException.printStackTrace();
}
catch(Exception e)
{
System.out.println(e);
}
}
public static void main(String ...s)
{
GetResult gr=new GetResult();
gr.result();
}
}
下面是我的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="report2" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" isIgnorePagination="true" uuid="204c18b7-de66-4171-b8b8-82a20b837f28">
<property name="ireport.zoom" value="1.0"/>
<property name="ireport.x" value="0"/>
<property name="ireport.y" value="0"/>
<subDataset name="sum" uuid="73ad5db5-041e-4e27-aed3-acaf6deec1b8">
<queryString language="SQL">
<![CDATA[]]>
</queryString>
<field name="First_name" class="java.lang.String"/>
<field name="Last_name" class="java.lang.String"/>
<field name="Designation" class="java.lang.String"/>
<field name="Department" class="java.lang.String"/>
</subDataset>
<field name="First_name" class="java.lang.String">
<fieldDescription><![CDATA[]]></fieldDescription>
</field>
<field name="Last_name" class="java.lang.String">
<fieldDescription><![CDATA[]]></fieldDescription>
</field>
<field name="Designation" class="java.lang.String">
<fieldDescription><![CDATA[]]></fieldDescription>
</field>
<field name="Department" class="java.lang.String">
<fieldDescription><![CDATA[]]></fieldDescription>
</field>
<background>
<band splitType="Stretch"/>
</background>
<columnHeader>
<band height="35" splitType="Stretch">
<staticText>
<reportElement uuid="2322e160-4c43-4027-af14-3c69a4d236ed" x="8" y="4" width="100" height="20" backcolor="#003333"/>
<textElement/>
<text><![CDATA[First_name]]></text>
</staticText>
<staticText>
<reportElement uuid="a5f84e13-ffee-491f-aa52-602b7b4e9c99" x="149" y="4" width="100" height="20" forecolor="#9999FF" backcolor="#00FFFF"/>
<textElement/>
<text><![CDATA[Last_name]]></text>
</staticText>
<staticText>
<reportElement uuid="cd216988-6061-4ef2-8f4d-18e31cabd9e1" x="299" y="4" width="100" height="20"/>
<textElement/>
<text><![CDATA[Designation]]></text>
</staticText>
<staticText>
<reportElement uuid="22587697-d3b8-4a55-b81d-d380a4e19a7a" x="433" y="4" width="100" height="20"/>
<textElement/>
<text><![CDATA[Department]]></text>
</staticText>
</band>
</columnHeader>
<detail>
<band height="26" splitType="Stretch">
<textField>
<reportElement uuid="3f6821a6-3aa1-418f-aa68-25b844256276" key="First_name" x="8" y="0" width="100" height="21"/>
<textElement/>
<textFieldExpression><![CDATA[$F{First_name}]]></textFieldExpression>
</textField>
<textField>
<reportElement uuid="e453bc45-a734-4db6-bba5-19a24252d3ba" x="149" y="0" width="100" height="20"/>
<textElement/>
<textFieldExpression><![CDATA[$F{Last_name}]]></textFieldExpression>
</textField>
<textField>
<reportElement uuid="5c604a9d-5dba-4b47-9e8c-41de0a29323c" x="299" y="0" width="100" height="20"/>
<textElement/>
<textFieldExpression><![CDATA[$F{Designation}]]></textFieldExpression>
</textField>
<textField>
<reportElement uuid="fa2e53f2-ff71-485d-b9ef-0259ace3eabb" x="433" y="0" width="100" height="20"/>
<textElement/>
<textFieldExpression><![CDATA[$F{Department}]]></textFieldExpression>
</textField>
</band>
</detail>
<columnFooter>
<band height="45" splitType="Stretch"/>
</columnFooter>
<pageFooter>
<band height="54" splitType="Stretch"/>
</pageFooter>
<summary>
<band height="42" splitType="Stretch"/>
</summary>
</jasperReport>
当我运行GetResult.java时,它会出现以下错误：
net.sf.jasperreports.engine.JRException: Error retrieving field value from bean : First_namenet.sf.jasperreports.engine.JRException: Error retrieving field value from bean : First_name
at net.sf.jasperreports.engine.data.JRAbstractBeanDataSource.getBeanProperty(JRAbstractBeanDataSource.java:123)
at net.sf.jasperreports.engine.data.JRAbstractBeanDataSource.getFieldValue(JRAbstractBeanDataSource.java:96)
at net.sf.jasperreports.engine.data.JRBeanCollectionDataSource.getFieldValue(JRBeanCollectionDataSource.java:100)
at net.sf.jasperreports.engine.fill.JRFillDataset.setOldValues(JRFillDataset.java:1331)
at net.sf.jasperreports.engine.fill.JRFillDataset.next(JRFillDataset.java:1232)
at net.sf.jasperreports.engine.fill.JRFillDataset.next(JRFillDataset.java:1208)
at net.sf.jasperreports.engine.fill.JRBaseFiller.next(JRBaseFiller.java:1577)
at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(JRVerticalFiller.java:149)
at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:932)
at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:864)
at net.sf.jasperreports.engine.fill.JRFiller.fill(JRFiller.java:88)
at net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:653)
at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:969)
at GetResult.result(GetResult.java:78)
at GetResult.main(GetResult.java:99)
Caused by: java.lang.NoSuchMethodException: Unknown property 'First_name'
at org.apache.commons.beanutils.PropertyUtils.getSimpleProperty(PropertyUtils.java:1175)
at org.apache.commons.beanutils.PropertyUtils.getNestedProperty(PropertyUtils.java:772)
at org.apache.commons.beanutils.PropertyUtils.getProperty(PropertyUtils.java:801)
at net.sf.jasperreports.engine.data.JRAbstractBeanDataSource.getBeanProperty(JRAbstractBeanDataSource.java:111)
... 14 more
请帮我解决这个问题.
解决方法:
将字段重命名为以小写字母开头,并将getter和setter方法对应.喜欢：
String firstName;
public String getFirstName() {
return firstName;
}
public void setFirstName(String First_name) {
this.firstName= First_name;
}
Jasper寻找尊重java会议的相应getter.
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