ADF_140：Tree组件使用指南之十：获取选中的Tree节点

运行环境：JDeveloper 11.1.2.2.0 + Oracle Database 10g Express Edition 10.2.0.1。

实际情况中，经常需要获取选中的Tree节点信息，与定制TreeSelectionListener每次点击选中一个节点略有不同，可以通过按住Ctrl键选取多个节点。

说明，本实验基于定制SelectionListener。

1. 创建一个新页面：tree_selected_node.jsf
（1）设置RowSelection=mutiple，允许多选。
（2）设置Binding，指向Managed Bean中的一个属性。
（3）放置一个按钮，点击按钮，调用Managed Bean中的方法，获取选中的Tree节点

2. 完整的Managed Bean代码

package view;

import java.util.Iterator;
import java.util.List;

import javax.faces.event.ActionEvent;

import oracle.adf.view.rich.component.rich.data.RichTree;

import oracle.adf.view.rich.component.rich.data.RichTreeTable;

import oracle.jbo.Row;
import oracle.jbo.uicli.binding.JUCtrlHierBinding;
import oracle.jbo.uicli.binding.JUCtrlHierNodeBinding;

import oracle.jbo.uicli.binding.JUCtrlHierTypeBinding;

import org.apache.myfaces.trinidad.event.SelectionEvent;

import org.apache.myfaces.trinidad.model.CollectionModel;
import org.apache.myfaces.trinidad.model.RowKeySet;

import view.util.JSFUtils;

public class MyBackingBean {
    private RichTree tree;

    public MyBackingBean() {
    }

    public void treeSelectionListener(SelectionEvent selectionEvent) {
        JSFUtils.invokeMethodExpression("#{bindings.DepartmentsView1.treeModel.makeCurrent}", Object.class,
                                        SelectionEvent.class, selectionEvent);

        RichTree tree = (RichTree)selectionEvent.getSource();
        RowKeySet rowKeySet = selectionEvent.getAddedSet();
        Iterator rksIterator = rowKeySet.iterator();
        while (rksIterator.hasNext()) {
            List key = (List)rksIterator.next();
            JUCtrlHierBinding treeBinding = null;
            CollectionModel collectionModel = (CollectionModel)tree.getValue();
            treeBinding = (JUCtrlHierBinding)collectionModel.getWrappedData();
            JUCtrlHierNodeBinding nodeBinding = treeBinding.findNodeByKeyPath(key);

            String[] strs = nodeBinding.getAttributeNames();
            for (String str : strs) {
                System.out.println("########################### " + str + ":" + nodeBinding.getAttribute(str));
            }

            Row rw = nodeBinding.getRow();
            String rowType = rw.getStructureDef().getDefName();
            System.out.println("########################### rowType " + rowType);

            JUCtrlHierTypeBinding typeBinding = nodeBinding.getHierTypeBinding();
            String nodeStuctureDefname = typeBinding.getStructureDefName();
            System.out.println("########################### nodeStuctureDefname " + nodeStuctureDefname);
        }
    }

    public void buttonActionListener(ActionEvent actionEvent) {
        RichTree treeTable = this.getTree();
        RowKeySet rks = treeTable.getSelectedRowKeys();
        Iterator rksIterator = rks.iterator();
        while (rksIterator.hasNext()) {
            List key = (List)rksIterator.next();
            JUCtrlHierBinding treeTableBinding = null;
            CollectionModel collectionModel = (CollectionModel)tree.getValue();
            collectionModel.setRowKey(key);
            treeTableBinding = (JUCtrlHierBinding)collectionModel.getWrappedData();
            JUCtrlHierNodeBinding nodeBinding = treeTableBinding.findNodeByKeyPath(key);

            String[] strs = nodeBinding.getAttributeNames();
            for (String str : strs) {
                System.out.println("########################### " + str + ":" + nodeBinding.getAttribute(str));
            }
            
            Row rw = nodeBinding.getRow();
            System.out.println("########################### row " + rw);

            String rowType = rw.getStructureDef().getDefName();
            System.out.println("########################### rowType " + rowType);

            JUCtrlHierTypeBinding typeBinding = nodeBinding.getHierTypeBinding();
            String nodeStuctureDefname = typeBinding.getStructureDefName();
            System.out.println("########################### nodeStuctureDefname " + nodeStuctureDefname);
        }
    }

    public void setTree(RichTree tree) {
        this.tree = tree;
    }

    public RichTree getTree() {
        return tree;
    }
}

其中buttonActionListener是点击按钮调用的方法，这里最重要的一行代码是 collectionModel.setRowKey(key);，如果没有此行代码，nodeBinding会为Null。

3. 运行效果，按住Ctrl键多选几个节点，然后点击按钮
输出如下：
########################### DepartmentId:10
########################### DepartmentName:Administration
########################### row ViewRow [oracle.jbo.Key[10 ]]
########################### rowType DepartmentsView
########################### nodeStuctureDefname model.DepartmentsView
########################### DepartmentId:20
########################### DepartmentName:Marketing
########################### row ViewRow [oracle.jbo.Key[20 ]]
########################### rowType DepartmentsView
########################### nodeStuctureDefname model.DepartmentsView
########################### DepartmentId:40
########################### DepartmentName:Human Resources
########################### row ViewRow [oracle.jbo.Key[40 ]]
########################### rowType DepartmentsView
########################### nodeStuctureDefname model.DepartmentsView
########################### DepartmentId:30
########################### DepartmentName:Purchasing
########################### row ViewRow [oracle.jbo.Key[30 ]]
########################### rowType DepartmentsView
########################### nodeStuctureDefname model.DepartmentsView

Project 下载：ADF_Tree_SelectionListener(6).7z

参考文献：
1. http://muhongdi.blog.163.com/blog/static/4325035120114161078850/
2. http://www.oracle.com/technetwork/developer-tools/adf/learnmore/26-get-selected-tree-node-data-169165.pdf