net.sf.jasperreports.engine.JRException：从bean中检索字段值时出错：名字

我想用Jasper Reports创建CSV。有很多相关的问题，但没有任何工作适合我。下面是我的bean类：net.sf.jasperreports.engine.JRException：从bean中检索字段值时出错：名字

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; 
    } 
}

下面是一流的，从数据库中获取数据，并与碧玉报告生成CSV：

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它给出了以下错误：

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。

来源

2014-12-19 Sumit Kamboj

其jasperReport错误我认为你应该使用subdataset字段在你报告显示值，使用datasetRun像这样[multiple-queries-in-a-single-jasper-document]（http://stackoverflow.com/questions/ 7482412 /多查询功能于一个单碧玉文档）。我的建议，你应该尝试不同的名字，我看到很多First_name。尝试在dataBean中自动生成getter，setter – techGaurdian 2014-12-19 05:34:03

“DataBean”字段和getter/setter命名令我的脊椎冷静下来 – 2016-10-04 10:40:00

重命名您的字段以小写字母开头，并使您的getter和setter方法相对应。像：

String firstName; 
public String getFirstName() { 
    return firstName; 
} 
public void setFirstName(String First_name) { 
     this.firstName= First_name; 
}

贾斯珀寻找对应的java对流getter。

来源

2014-12-19 09:18:17 Laura

这是正确的方法。但是另外，提问者必须在JRXML中将字段$ F {First_name}重命名为$ F {firstName}。之后，JRXML中的字段名称将与getter对应。 – sanBez 2014-12-19 10:44:10

感谢球员....一个更多的帮助，列标题不显示在CSV文件，你能告诉我如何填充单元格颜色？ – 2014-12-19 11:32:01

1. csv中的列标题：我不知道2.填充颜色：AFAIR，你必须定义backColor和opaque属性，例如'' – sanBez 2014-12-19 14:27:11

net.sf.jasperreports.engine.JRException：从bean中检索字段值时出错：名字

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