JavaSwing实现树形结构

原文链接：http://blog.csdn.net/syb18810107241/article/details/17166093

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】