使用JasperReports API从bean异常检索字段值时出错

Sachin Verma 发表于 Dev

萨钦·维玛（Sachin Verma）

我正在尝试获取JasperReports生成的示例报告，但是它引发了一些我无法理解的异常。

我有一个豆：

class DataBean {

    public String country;
    public String name;

    public String getCountry() {
        return country;
    }

    public void setCountry(String country) {
        this.country = country;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

一个产生上述bean列表的类：

class DataBeanList {
    public ArrayList<DataBean> getDataBeanList() {
        ArrayList<DataBean> dataBeanList = new ArrayList<DataBean>();
        dataBeanList.add(produce("Manisha", "India"));
        dataBeanList.add(produce("Dennis Ritchie", "USA"));
        dataBeanList.add(produce("V.Anand", "India"));
        dataBeanList.add(produce("Shrinath", "California"));
        return dataBeanList;
    }

    private DataBean produce(String name, String country) {
        DataBean dataBean = new DataBean();
        dataBean.setName(name);
        dataBean.setCountry(country);
        return dataBean;
    }
}

这就是我在做什么：

public static void main(String[] args) throws Exception {
    String sourceFileName = "/home/oodles/Samples/jasper_report_template.jasper";
    DataBeanList DataBeanList = new DataBeanList();
    ArrayList<DataBean> dataList = DataBeanList.getDataBeanList();
    System.out.println("<<<" + dataList.get(0).getCountry());
    JasperReportBuilder report = DynamicReports.report();
    JRBeanCollectionDataSource beanColDataSource = new JRBeanCollectionDataSource(dataList, false);
    report.setDataSource(beanColDataSource);
    Map parameters = new HashMap();
    try {
        JasperFillManager.fillReportToFile(sourceFileName, parameters,
                beanColDataSource);
    } catch (JRException e) {
        e.printStackTrace();
    }
}

异常如下：

    net.sf.jasperreports.engine.JRException: Error retrieving field value from bean : country
    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:1554)
    at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(JRVerticalFiller.java:149)
    at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:909)
    at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:841)
    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.fillToFile(JasperFillManager.java:542)
    at net.sf.jasperreports.engine.JasperFillManager.fillToFile(JasperFillManager.java:494)
    at net.sf.jasperreports.engine.JasperFillManager.fillReportToFile(JasperFillManager.java:874)
    at com.general.ReportsMain.main(ReportsMain.java:80)
Caused by: java.lang.NoSuchMethodException: Property 'country' has no getter method in class 'class com.general.DataBean'
    at org.apache.commons.beanutils.PropertyUtilsBean.getSimpleProperty(PropertyUtilsBean.java:1318)
    at org.apache.commons.beanutils.PropertyUtilsBean.getNestedProperty(PropertyUtilsBean.java:762)
    at org.apache.commons.beanutils.PropertyUtilsBean.getProperty(PropertyUtilsBean.java:837)
    at org.apache.commons.beanutils.PropertyUtils.getProperty(PropertyUtils.java:426)
    at net.sf.jasperreports.engine.data.JRAbstractBeanDataSource.getBeanProperty(JRAbstractBeanDataSource.java:111)
    ... 15 more

如果您需要查看.jasper文件源：
我仅附加字段以仅在此处显示有意义的代码：

<field name="country" class="java.lang.String">
    <fieldDescription><![CDATA[country]]></fieldDescription>
</field>
<field name="name" class="java.lang.String">
    <fieldDescription><![CDATA[name]]></fieldDescription>
</field>

萨钦·维玛（Sachin Verma）

最后，我弄清楚了您需要做些什么以避免任何异常：

您可以在其他包中访问您的数据源以从中提取数据，并且如果您的数据源的bean不是公共的，则无法访问该类。
因此，您需要将您的类公开（bean类）。

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