How to Display Data from a Java List in a JavaBean Using JRBeanCollectionDataSource?

JRBeanCollectionDataSource: Displaying Data from a Java List in a JavaBean

Overview

JavaBean-based reports often involve displaying data contained within Java Lists. This article explores how to achieve this using JRBeanCollectionDataSource.

Implementation

Step 1: Create a JavaBean with a List Field

public class Userinfo {
    private String username;
    private String password;
    private List<Address> listAddress;
}

Step 2: Generate Dataset for the List

private static JRDataSource getDataSource() {
    Collection<BeanWithList> coll = new ArrayList<BeanWithList>();
    coll.add(new BeanWithList(Arrays.asList("London", "Paris"), 1));
    coll.add(new BeanWithList(Arrays.asList("London", "Madrid", "Moscow"), 2));
    coll.add(new BeanWithList(Arrays.asList("Rome"), 3));

    return new JRBeanCollectionDataSource(coll);
}

Step 3: Define the JRXML Report

In the report, create a subdataset for the list and a componentElement (jr:list) in the Detail band.

<subDataset name="dataset1">
    <field name="city" class="java.lang.String">
        <fieldDescription><![CDATA[_THIS]]></fieldDescription>
    </field>
</subDataset>

...

<detail>
    <componentElement>
        <jr:list printOrder="Vertical">
            <datasetRun subDataset="dataset1">
                <dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($F{cities})]]></dataSourceExpression>
            </datasetRun>
        </jr:list>
    </componentElement>
</detail>

Key Points

• _THIS expression is used in the subdataset to retrieve the current element of the list.
• The jr:list component within the Detail band displays the list's elements.

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