java 动态的给树添加新节点 望高手指点啊

import java.awt.*

import java.awt.event.*

import javax.swing.*

import javax.swing.event.*

import javax.swing.tree.*

public class TreeTest implements ActionListener,TreeModelListener{

JLabel label=null

JTree tree=null

DefaultTreeModel treeModel=null

String nodeName=null//原有节点名称

public TreeTest(){

JFrame f=new JFrame("TreeTest")

Container contentPane=f.getContentPane()

DefaultMutableTreeNode root=new DefaultMutableTreeNode("资源管理器")

tree=new JTree(root)

tree.setEditable(true)

tree.addMouseListener(new MouseHandle())

treeModel=(DefaultTreeModel)tree.getModel()

treeModel.addTreeModelListener(this)

JScrollPane scrollPane=new JScrollPane()

scrollPane.setViewportView(tree)

JPanel panel=new JPanel()

JButton b=new JButton("新增节点")

b.addActionListener(this)

panel.add(b)

b=new JButton("删除节点")

b.addActionListener(this)

panel.add(b)

b=new JButton("清除所有节点")

b.addActionListener(this)

panel.add(b)

label=new JLabel("Action")

contentPane.add(panel,BorderLayout.NORTH)

contentPane.add(scrollPane,BorderLayout.CENTER)

contentPane.add(label,BorderLayout.SOUTH)

f.pack()

f.setVisible(true)

f.addWindowListener(new WindowAdapter(){

public void windowClosing(WindowEvent e){

System.exit(0)

}

})

}

//本方法运行新增、删除、清除所有节点的程序代码.

public void actionPerformed(ActionEvent ae){

if (ae.getActionCommand().equals("新增节点")){

DefaultMutableTreeNode parentNode=null

DefaultMutableTreeNode newNode=new DefaultMutableTreeNode("新节点")

newNode.setAllowsChildren(true)

TreePath parentPath=tree.getSelectionPath()

//取得新节点的父节点

parentNode=(DefaultMutableTreeNode)(parentPath.getLastPathComponent())

//由DefaultTreeModel的insertNodeInto（）方法增加新节点

treeModel.insertNodeInto(newNode,parentNode,parentNode.getChildCount())

//tree的scrollPathToVisible()方法在使Tree会自动展开文件夹以便显示所加入的新节点。若没加这行则加入的新节点

//会被 包在文件夹中，你必须自行展开文件夹才看得到。

tree.scrollPathToVisible(new TreePath(newNode.getPath()))

label.setText("新增节点成功")

}

if (ae.getActionCommand().equals("删除节点")){

TreePath treepath=tree.getSelectionPath()

if (treepath!=null){

//下面两行取得选取节点的父节点.

DefaultMutableTreeNode selectionNode=(DefaultMutableTreeNode)treepath.getLastPathComponent()

TreeNode parent=(TreeNode)selectionNode.getParent()

if (parent!=null) {

//由DefaultTreeModel的removeNodeFromParent()方法删除节点，包含它的子节点。

treeModel.removeNodeFromParent(selectionNode)

label.setText("删除节点成功")

}

}

}

if (ae.getActionCommand().equals("清除所有节点")){

//下面一行，由DefaultTreeModel的getRoot()方法取得根节点.

DefaultMutableTreeNode rootNode=(DefaultMutableTreeNode)treeModel.getRoot()

//下面一行删除所有子节点.

rootNode.removeAllChildren()

//删除完后务必运行DefaultTreeModel的reload() *** 作，整个Tree的节点才会真正被删除.

treeModel.reload()

label.setText("清除所有节点成功")

}

}

public void treeNodesChanged(TreeModelEvent e){

TreePath treePath=e.getTreePath()

DefaultMutableTreeNode node=(DefaultMutableTreeNode)treePath.getLastPathComponent()

try{

int[] index=e.getChildIndices()

node=(DefaultMutableTreeNode)node.getChildAt(index[0])

}catch(NullPointerException exc){}

label.setText(nodeName+"更改数据为:"+(String)node.getUserObject())

}

public void treeNodesInserted(TreeModelEvent e){

System.out.println("new node insered")

}

public void treeNodesRemoved(TreeModelEvent e){

System.out.println("node deleted")

}

public void treeStructureChanged(TreeModelEvent e){

System.out.println("Structrue changed")

}

public static void main(String[] args){

new TreeTest()

}

class MouseHandle extends MouseAdapter{

public void mousePressed(MouseEvent e){

try{

JTree tree=(JTree)e.getSource()

int rowLocation=tree.getRowForLocation(e.getX(),e.getY())

TreePath treepath=tree.getPathForRow(rowLocation)

TreeNode treenode=(TreeNode)treepath.getLastPathComponent()

nodeName=treenode.toString()

}catch(NullPointerException ne){}

}

}

}

这里使用了dom4j组件，你需要自己去下载dom4j。

其中a.xml是你的源文件。

这个程序没有向磁盘中创建一个新文件，你可以自己修改代码。

例如：

XMLWriter xmlWriter = new XMLWriter(new PrintWriter(System.out), format)

可以修改为

XMLWriter xmlWriter = new XMLWriter(new FileWriter("a.xml"), format)

这样就可以修改源文件a.xml了。

*/

import org.dom4j.*

import org.dom4j.io.OutputFormat

import org.dom4j.io.XMLWriter

import org.dom4j.io.SAXReader

import java.io.*

public class Test {

public static void main(String[] args) {

SAXReader saxReader = new SAXReader()

try {

Document doc = saxReader.read(new File("a.xml"))

doc.getRootElement().addElement("PARAM")

.addElement("TASKLIST").addElement("TASK")

.addElement("DATA_TRAN_ID").addCDATA("14595")

OutputFormat format = OutputFormat.createPrettyPrint()

format.setEncoding("gb2312")

XMLWriter xmlWriter = new XMLWriter(new PrintWriter(System.out), format)

xmlWriter.write(doc)

xmlWriter.close()

} catch (DocumentException e) {

e.printStackTrace()

} catch(IOException e) {

e.printStackTrace()

}

}

}

    <!--表格树js -->

    <script>

        $(function(){

            var setting = {

                view:{showLine:true, showIcon: false}, //有没有连线和显不示显示图标

               //下面语句可以让pid相同的分层

                data: {

                    simpleData: {

                        enable: true //自动成圣树结构

                    }

                },

                callback: {

            onClick: zTreeOnClick //回调点击函数

        }

            }    

            //动态获取数据自动生成树

            $.ajax({

                type: "post",

                url: "../tools/admin_ajax.ashx?action=GetCallContent&time=" + Math.random(),//链接地址

                dataType: "html",

                success: function (data) {

                    //转换一下json

                    var myNodes = JSON.parse(data)

                    var zNodes = []

                  //  alert(myNodes)

                    for (var i = 0 i < myNodes.length i++) {    //判断                 

                        if (myNodes[i].open != null) {

                            if (myNodes[i].checked != null && myNodes[i].checked )

                                zNodes[i] = { id: myNodes[i].id, pId: myNodes[i].pId, name: myNodes[i].name, answer:myNodes[i].answer, open: true, checked: true }

                            else

                                zNodes[i] = { id: myNodes[i].id, pId: myNodes[i].pId, name: myNodes[i].name, answer:myNodes[i].answer, open: true }

                        }

                        else {

                            if (myNodes[i].checked != null && myNodes[i].checked )

                                zNodes[i] = { id: myNodes[i].id, pId: myNodes[i].pId, name: myNodes[i].name, answer:myNodes[i].answer, checked: true }

                            else

                                zNodes[i] = { id: myNodes[i].id, pId: myNodes[i].pId, name: myNodes[i].name, answer:myNodes[i].answer,}

                        }

                    }

                    $.fn.zTree.init($("#demoZtree"), setting, zNodes)//初始化树

                    $.fn.zTree.getZTreeObj("#demoZtree")//把得到的树赋给div

                }

            })

           //动态生成树的 ztree子节点点击事件

            function zTreeOnClick(event, treeId, treeNode) {

                // alert(treeNode.tId + ", " + treeNode.name)

                $("#eventProblemDesc1").html(treeNode.name)//把标题赋值给div

               //插入节点到右边的框内   $("#tab_content_ztree_explain").html(treeNode.name+':')

                $.ajax({

                    type: "get",

                    url: "../tools/admin_ajax.ashx?action=GetCallContent&time=" + Math.random(),

                    dataType: "html",

                    success: function (data) {

                        //转换一下

                        var myNodes = JSON.parse(data)

                        var zNodes = []

                        //利用Selected获取 zTree 当前被选中的节点数据集合

                        var treeObj = $.fn.zTree.getZTreeObj("demoZtree")

                        var nodes = treeObj.getSelectedNodes()

                       // console.log(nodes)

                        for (var i = 0 i < myNodes.length i++) { 

                            var item = myNodes[i]

                            if(item.id == nodes[0].id){  //<span style="font-family: Arial, Helvetica, sans-serif">判断树节点与点击的节点对应的id是否相等</span>

                                   //  alert(item)

                                    var cont = '' 

                                    cont+=item.answer 

                                    $('#tab_content_ztree_explain').html(cont) //赋值给div

                                   // $('treeNode.name').html(answ) 

                            }

                        }

                    }

                })

            }

        })

    </script>