Java 怎么从jsf uicomponent创建select项

2019年8月15日21:19:18 评论 37

1.简介

Java 怎么从jsf uicomponent创建select项?——请看下文。

2.代码

/**
 * 版权所有 编程十万个怎么办(www.tah1986.com)
 */

 
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import javax.el.ValueExpression;
import javax.faces.FacesException;
import javax.faces.component.EditableValueHolder;
import javax.faces.component.UIComponent;
import javax.faces.component.UIForm;
import javax.faces.component.UISelectItem;
import javax.faces.component.UISelectItems;
import javax.faces.component.ValueHolder;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.model.SelectItem;

public class Main{
    public static List<SelectItem> createSelectItems(UIComponent component) {
        List<SelectItem> items = new ArrayList<SelectItem>();
        Iterator<UIComponent> children = component.getChildren().iterator();

        while (children.hasNext()) {
            UIComponent child = children.next();

            if (child instanceof UISelectItem) {
                UISelectItem selectItem = (UISelectItem) child;

                items.add(new SelectItem(selectItem.getItemValue(),
                        selectItem.getItemLabel()));
            } else if (child instanceof UISelectItems) {
                Object selectItems = ((UISelectItems) child).getValue();

                if (selectItems instanceof SelectItem[]) {
                    SelectItem[] itemsArray = (SelectItem[]) selectItems;

                    for (SelectItem item : itemsArray)
                        items.add(new SelectItem(item.getValue(), item
                                .getLabel()));

                } else if (selectItems instanceof Collection) {
                    @SuppressWarnings("unchecked")
                    Collection<SelectItem> collection = (Collection<SelectItem>) selectItems;

                    for (SelectItem item : collection)
                        items.add(new SelectItem(item.getValue(), item
                                .getLabel()));
                }
            }
        }

        return items;
    }
}

 

3.总结

示例代码演示了 Java 怎么从jsf uicomponent创建select项,具体步骤参见示例代码。

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