Primefaces对要在页脚中显示的特定列求和

<h:form>
    <p:dataTable value="#{yourManagedBean.yourDataModel}" var="item">
        <p:columnGroup type="footer">
            <p:column headerText="Column 1">
                <h:outputText value="Total:" />
            </p:column>
            <p:column headerText="Column 2">
                <h:outputText value="#{yourManagedBean.sum}" />
            </p:column>
        </p:columnGroup>
        
        <!-- Other columns -->
        
    </p:dataTable>
</h:form>

@ManagedBean
@ViewScoped
public class YourManagedBean implements Serializable {
    private List<YourDataModel> yourDataModel;
    private double sum;
    
    // Getter and setter methods
    
    public void calculateSum() {
        sum = 0;
        for (YourDataModel item : yourDataModel) {
            sum += item.getColumn2();
        }
    }
}