Richfaces構建節點樹

最新推荐文章于 2024-09-15 10:47:14 发布

最新推荐文章于 2024-09-15 10:47:14 发布 · 94 阅读

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#richfaces #Seam #JSF #Ajax #EJB

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本文介绍如何使用EJB+JSF+SEAM技术栈结合Richfaces组件库实现富客户端应用中的树形结构数据展示。具体包括实体类`PartType`的设计，用于构建树形结构的SessionBean及Action逻辑，以及页面上树形结构的配置和事件处理。

EJB+JSF+SEAM 使用Richfaces中的Tree和TreeNode組件

Entity部分關鍵代碼：

public class PartType {

	//屬性...

	private PartType parent;
	private Set<PartType> children = new HashSet<PartType>();


	//屬性對應的getter、setter......

	@ManyToOne
	public PartType getParent() {
		return parent;
	}

	public void setParent(PartType parent) {
		this.parent = parent;
	}

	@OneToMany(fetch = FetchType.LAZY, mappedBy = "parent")
	public Set<PartType> getChildren() {
		return children;
	}

	public void setChildren(Set<PartType> children) {
		this.children = children;
	}
	
	public void addChildren(PartType pt) {
		this.children.add(pt);
	}
	
		
}

SessionBean代碼......

Action部分關鍵代碼：

@Name("ptAction")
@Scope(ScopeType.CONVERSATION)
public class PartTypeAction {

	@Logger
	private Log log;

	@In
	private IPartTypeManager ptManager;

	@Out(required = false)
	private PartType selectpt;

	public PartType getSelectpt() {
		return selectpt;
	}

	public void setSelectpt(PartType selectpt) {
		this.selectpt = selectpt;
	}

	/*
	 * 遞歸節點樹
	 */
	private TreeNode<PartType> addChild(TreeNode<PartType> curNode,
			PartType curPT) {
		curNode.setData(curPT);
		log.info("遍歷： " + curPT.getName());
		if (curPT.getChildren().size() > 0) {
			for (Iterator iterator = curPT.getChildren().iterator(); iterator
					.hasNext();) {
				PartType childptItem = (PartType) iterator.next();
				TreeNode<PartType> childpt = new TreeNodeImpl<PartType>();
				curNode.addChild(childptItem.getId(), childpt);// 子節點加到當前節點下
				addChild(childpt, childptItem);
			}
		}
		return curNode;
	}

	/*
	 * 構建樹
	 */
	@Begin(join = true)
	public TreeNode<PartType> getPTTree() {
		log.info("構建PartType Tree");
		PartType ptroot = ptManager.getRootPartType();//調用SessionBean中的方法以獲取父節點

		TreeNode<PartType> root = new TreeNodeImpl<PartType>();
		this.addChild(root, ptroot);
		TreeNode<PartType> vroot = new TreeNodeImpl<PartType>();
		vroot.addChild(root.getData().getId(), root);
		return vroot;

	}

	/*
	 * 選擇一個節點觸發事件
	 */
	@Begin(join = true)
	public void processSelection(NodeSelectedEvent event) {
		UITree tree = getTree(event);
		if (tree != null) {
			selectpt = (PartType) tree.getTreeNode().getData();
			log.info("選中節點:" + selectpt.getName());
			this.setSelectpt(selectpt);
		}
	}

	private UITree getTree(FacesEvent event) {
		UIComponent component = event.getComponent();
		if (component instanceof UITree) {
			return ((UITree) component);
		}

		if (component instanceof UITreeNode) {
			return ((UITree) component.getParent());
		}

		return null;
	}

}

頁面代碼：

						<rich:tree swidth="100%" value="#{ptAction.PTTree}" var="item"
							switchType="ajax" reRender="userdata"
							nodeSelectListener="#{ptAction.processSelection}"
							ajaxSubmitSelection="true">
							<rich:treeNode>
								<h:outputText value="#{item.name}" />
							</rich:treeNode>
						</rich:tree>