用APPLET来写树形菜单
package application;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import java.net.*;
import java.applet.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
public class TreeApplet extends javax.swing.JApplet {
/** Initializes the applet TreeApplet */
public void init() {
try {
m_model = InitManuModel();
java.awt.EventQueue.invokeAndWait(new Runnable() {
public void run() {
initComponents();
}
});
} catch (Exception ex) {
ex.printStackTrace();
}
}
private void initComponents() {
jScrollPane = new javax.swing.JScrollPane();
jTree = new javax.swing.JTree();
jScrollPane.setViewportBorder(new javax.swing.border.EtchedBorder(javax.swing.border.EtchedBorder.RAISED, new java.awt.Color(204, 0, 204), new java.awt.Color(51, 51, 51)));
jTree.setDragEnabled(true);
jTree.setModel(m_model);
jTree.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() {
public void mouseDragged(java.awt.event.MouseEvent evt) {
jTreeMouseDragged(evt);
}
});
jTree.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jTreeMouseClicked(evt);
}
});
jScrollPane.setViewportView(jTree);
getContentPane().add(jScrollPane, java.awt.BorderLayout.CENTER);
}
private void jTreeMouseClicked(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jTreeMouseClicked
int selRow = jTree.getRowForLocation(evt.getX(), evt.getY());
javax.swing.tree.TreePath selPath =jTree.getPathForLocation(evt.getX(), evt.getY());
if(selRow!=-1)
{
javax.swing.tree.DefaultMutableTreeNode node=
(DefaultMutableTreeNode)selPath.getLastPathComponent();
ManuNode iManuNode=(ManuNode)node.getUserObject();
System.out.println(iManuNode.toString());
if(iManuNode.getType()==1){
if(evt.getClickCount()==2){
try{
URL url=new URL(iManuNode.getUrl());
AppletContext context = getAppletContext();
if(!iManuNode.getTarge().equals("")){
context.showDocument(url, iManuNode.getTarge());
}else{
context.showDocument(url,"_blank");
}
}
catch(MalformedURLException e){
System.out.println(e);
}
}
}
}
}
private javax.swing.tree.DefaultTreeModel InitManuModel() {
javax.swing.tree.DefaultTreeModel m_model;
javax.swing.tree.DefaultMutableTreeNode top ;
loop=0;
top=InitNode(0);
if(top==null){
top=new javax.swing.tree.DefaultMutableTreeNode(new ManuNode(-1,"error!!!","",""));
}
m_model = new javax.swing.tree.DefaultTreeModel(top);
return m_model;
}
private javax.swing.tree.DefaultMutableTreeNode InitNode(int parenID){
javax.swing.tree.DefaultMutableTreeNode node,childe;
if(parenID==-1)
return null;
ManuNode iManuNode;
iManuNode=getManuNode("param"+parenID);
node=new javax.swing.tree.DefaultMutableTreeNode(iManuNode);
while(true){
loop++;
iManuNode=getManuNode("param"+loop);
if(iManuNode.getType()==1){
childe=new javax.swing.tree.DefaultMutableTreeNode(iManuNode);
node.add(childe);
}else if(iManuNode.getType()==0){
childe=InitNode(loop);
node.add(childe);
}if(iManuNode.getType()==2){
break;
}
}
return node;
}
private ManuNode getManuNode(String name){
String retString=getParameter(name);
ManuNode iManuNode;
String sType="";
int iType=-1;
String ManuName="";
String Url="";
String Targer="";
StringTokenizer sToken;
if(retString!=null){
sToken=new StringTokenizer(retString,",");
if(sToken.hasMoreTokens())
sType=sToken.nextToken();
if(sToken.hasMoreTokens())
ManuName=sToken.nextToken();
if(sToken.hasMoreTokens())
Url=sToken.nextToken();
if(sToken.hasMoreTokens())
Targer=sToken.nextToken();
if(!sType.equals(""))
iType=Integer.parseInt(sType);
}
iManuNode=new ManuNode(iType,ManuName,Url,Targer);
return iManuNode;
}
private class ManuNode extends Object {
public ManuNode(){
this.Type=-1;
this.ManuName="";
this.Url="";
this.Targe="";
}
public ManuNode(int Type,String ManuName){
this.Type=Type;
this.ManuName=ManuName;
this.Url="";
this.Targe="";
}
public ManuNode(int Type,String ManuName,String Url){
this.Type=Type;
this.ManuName=ManuName;
this.Url=Url;
this.Targe="";
}
public ManuNode(int Type,String ManuName,String Url,String Targe){
this.Type=Type;
this.ManuName=ManuName;
this.Url=Url;
this.Targe=Targe;
}
public int getType(){
return Type;
}
public String getManuName(){
return ManuName;
}
public String getUrl(){
return Url;
}
public String getTarge(){
return Targe;
}
public void setType(int Type){
this.Type=Type;
}
public void setManuName(String ManuName){
this.ManuName=ManuName;
}
public void setUrl(String Url){
this.Url=Url;
}
public void setTarge(String Targe){
this.Targe=Targe;
}
public String toString(){
return ManuName;
}
private int Type;
private String ManuName;
private String Url;
private String Targe;
}
private javax.swing.tree.DefaultTreeModel m_model;
int loop;
private javax.swing.JScrollPane jScrollPane;
private javax.swing.JTree jTree;
}
我完成这些后，说一下参数的传递。下面是我配的一个示例：
<APPLET codebase="" code="application/TreeApplet.class" width=200 height=300>
<PARAM NAME="param0" VALUE="0,Manu, , ">
<PARAM NAME="param1" VALUE="0,ManuItem1,url,targe ">
<PARAM NAME="param2" VALUE="1,ManuItem1,http://www.baidu.com,_self">
<PARAM NAME="param3" VALUE="2,ManuItem1,url,targe ">
<PARAM NAME="param4" VALUE="0,ManuItem2,url,targe ">
<PARAM NAME="param5" VALUE="1,ManuItem1,http://www.baidu.com,_top">
<PARAM NAME="param6" VALUE="2,ManuItem2,url,targe ">
<PARAM NAME="param7" VALUE="1,ManuItem3,http://www.baidu.com, ">
<PARAM NAME="param8" VALUE="2,Manu, , ">
</APPLET>
其中VALUE="Type,ManuItemName,url,targe ",Type取值0，1，2；0是一个菜单的开始，1表示该项是菜单项则url,和Targe有效，2则表示菜单的结束。可嵌套使用，使用时仿照上面的示例即可。这个菜单做的很简单，有很多功能不完善，大家可已此为基础，扩展更多功能。