JavaSwing实现树形结构

一、Applet

package com.jy.applet.day1206;

import java.awt.Container;

import javax.swing.JApplet;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.jy.applet.day1206.swing.pane.TestPane;

/**
* 用来实现树形结构的Applet
*
* @author Administrator
*
*/
@SuppressWarnings("serial")
public class AppletTest1 extends JApplet {
private static final Log log = LogFactory.getLog(AppletTest1.class);// 日志记录
private static AppletTest1 instance;
public static Container container;// 一个可包含其他 AWT 组件的组件。

public void init() {
log.info("Applet初始化......");
instance = this;
SwingUtilities.invokeLater(new Runnable() {

public void run() {
try {
UIManager.setLookAndFeel(UIManager
.getSystemLookAndFeelClassName());//设置外观感觉
container = getContentPane();//获取内容面板
TestPane pane = new TestPane();//初始化主面板
container.add(pane);//将主面板添加到内容面板
} catch (Exception e) {
e.printStackTrace();
}

}

});
}

public static AppletTest1 getInstance() {
return instance;
}

public void destroy() {
log.info("程序正在关闭.....");
}

}

二、主面板

package com.jy.applet.day1206.swing.pane;

import java.util.List;

import javax.swing.JScrollPane;
import javax.swing.JTree;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.jy.applet.day1206.swing.tree.JTreeNode;
import com.jy.applet.util.DataTestDao;

@SuppressWarnings({"serial","unchecked"})
public class TestPane extends JScrollPane{
private static final Log log = LogFactory.getLog(TestPane.class);
private static TestPane instance;//实例变量
public JTree myTree;//面板中的树
JTreeNode rootNode ;//自定义根节点
public TestPane(){
instance = this;
init();
}

private void init() {
log.info("开始初始化主面板......");
setAutoscrolls(true);
getViewport().removeAll();
rootNode = new JTreeNode("中国");
JTreeNode secondTreeNode = null;//第二层节点
JTreeNode leafTreeNode = null;//叶子节点
List provinceList = DataTestDao.getProvinceList();//省份的集合
String provinceId = null;
/**如果省份和城市的集合不为空，并且元素个数大于0**/
if (provinceList != null && provinceList.size() > 0) {
for (int i = 0; i < provinceList.size(); i++) {
secondTreeNode = (JTreeNode) provinceList.get(i);//获取二层节点
provinceId = secondTreeNode.getId();//获取省份ID
List<JTreeNode> cityList = DataTestDao.getCityListByProID(provinceId);//根据省份ID查询城市
if(cityList != null && cityList.size() > 0){
for(int j = 0;j < cityList.size();j ++){
leafTreeNode = cityList.get(j);//获取叶子节点，即城市
secondTreeNode.add(leafTreeNode);//将叶子节点挂到第二层节点上
}
}
rootNode.add(secondTreeNode);//把第2层节点，添加到根节点
}
}

myTree = new JTree(rootNode);//以rootNode为根节点，创建一个树形结构
myTree.putClientProperty("JTree.lineStyle", "Horizontal");//树形结构的线条风格
myTree.setVisible(true);
myTree.updateUI();
instance.setViewportView(myTree);
/**注册事件**/
                MyTreeAdapter treeAdapter = new MyTreeAdapter();
                myTree.addTreeSelectionListener(treeAdapter);
 }
public static TestPane getInstance() {
return instance;
}
}

三、用来模拟数据库的DAO

package com.jy.applet.util;

import java.util.ArrayList;
import java.util.List;

import com.jy.applet.day1206.swing.tree.JTreeNode;
import com.jy.applet.entity.City;

/**
* 用户模拟数据的DAO
* @author Administrator
*
*/
@SuppressWarnings("unchecked")
public class DataTestDao {

public static List getProvinceList() {
List<String> provinces = new ArrayList<String>();
provinces.add("北京市");
provinces.add("天津市");
provinces.add("上海市");
provinces.add("重庆市");
provinces.add("山东省");
provinces.add("江苏省");
provinces.add("浙江省");
provinces.add("广东省");

List<JTreeNode> returnList = new ArrayList<JTreeNode>();
JTreeNode treeNode = null;
for(int i=0;i < provinces.size();i++){
treeNode = new JTreeNode(provinces.get(i));
treeNode.setId(i+"");
returnList.add(treeNode);
}
return returnList;
}

public static List<JTreeNode> getCityListByProID(String provinceId) {
List<City> citys = new ArrayList<City>();
List<JTreeNode> returnList = new ArrayList<JTreeNode>();
JTreeNode treeNode = null;
if(provinceId.equals("0")){
//北京市
citys.add(new City(provinceId,"海淀区"));
citys.add(new City(provinceId,"东城区"));
citys.add(new City(provinceId,"西城区"));
}else if(provinceId.equals("1")){
//天津市
citys.add(new City(provinceId,"河东区"));
citys.add(new City(provinceId,"河西区"));
citys.add(new City(provinceId,"塘沽区"));
}else if(provinceId.equals("2")){
//上海市
citys.add(new City(provinceId,"浦东新区"));
citys.add(new City(provinceId,"黄浦区"));
citys.add(new City(provinceId,"宝山区"));
}else if(provinceId.equals("3")){
//重庆市
citys.add(new City(provinceId,"渝北区"));
citys.add(new City(provinceId,"巫山县"));
citys.add(new City(provinceId,"涪陵区"));
}else if(provinceId.equals("4")){
//山东省
citys.add(new City(provinceId,"济南市"));
citys.add(new City(provinceId,"青岛市"));
citys.add(new City(provinceId,"烟台市"));
citys.add(new City(provinceId,"潍坊市"));
citys.add(new City(provinceId,"日照市"));
citys.add(new City(provinceId,"聊城市"));
}else if(provinceId.equals("5")){
//江苏省
citys.add(new City(provinceId,"南京市"));
citys.add(new City(provinceId,"徐州市"));
citys.add(new City(provinceId,"苏州市"));
citys.add(new City(provinceId,"无锡市"));
citys.add(new City(provinceId,"镇江市"));
citys.add(new City(provinceId,"扬州市"));
}else if(provinceId.equals("6")){
//浙江省
citys.add(new City(provinceId,"杭州市"));
citys.add(new City(provinceId,"温州市"));
citys.add(new City(provinceId,"宁波市"));
citys.add(new City(provinceId,"绍兴市"));
citys.add(new City(provinceId,"金华市"));
citys.add(new City(provinceId,"衢州市"));
}else if(provinceId.equals("7")){
//广东省
citys.add(new City(provinceId,"广州市"));
citys.add(new City(provinceId,"深圳市"));
citys.add(new City(provinceId,"珠海市"));
citys.add(new City(provinceId,"东莞市"));
citys.add(new City(provinceId,"惠州市"));
citys.add(new City(provinceId,"肇庆市"));
}else{

}
for(int i=0;i < citys.size();i++){
treeNode = new JTreeNode(citys.get(i).getName());
treeNode.setId(i+"");
returnList.add(treeNode);
}
return returnList;
}

}

四、监听器

package com.jy.applet.day1206.swing.adapter;

import javax.swing.JOptionPane;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.TreePath;

import com.jy.applet.day1206.swing.tree.JTreeNode;

public class MyTreeAdapter implements TreeSelectionListener {

@Override
public void valueChanged(TreeSelectionEvent e) {
TreePath treePath = e.getNewLeadSelectionPath();// 例如[中国, 江苏省, 南京市]
if (treePath != null) {
// 返回路径上最底层的组件，对于树形结构，即叶子节点
// this will return an instance of TreeNode.
JTreeNode node = (JTreeNode) treePath.getLastPathComponent();
StringBuilder sb = new StringBuilder();
sb.append("您选择的是：");
sb.append(node);
sb.append("\r\n");
sb.append("路径为：");
sb.append(treePath);
JOptionPane.showMessageDialog(null, sb, "提示",
JOptionPane.INFORMATION_MESSAGE);
} else {
JOptionPane.showMessageDialog(null, "您尚未选择省份或城市！", "错误",
JOptionPane.ERROR_MESSAGE);
}
}

}

五【效果如下】