java自动生成目录树

今天写了一天的目录树，感觉到很吃力，不想c#那种直接弄一个TreeList控件或声明的，把父编号和编号属性设一下就生成了目录树，但是java需要自己动手去写，而且是从数据库生成的，后来和同事一起交流，把它做完了，所以把它记下来：
package com.hq.test;

import java.util.ArrayList;

import javax.swing.*;
import javax.swing.tree.DefaultMutableTreeNode;
import com.hq.domain.Unit;
import com.hq.service.UnitService;
public class TreeList extends JPanel{
JTree jTree;
DefaultMutableTreeNode node;
DefaultMutableTreeNode shengNode;
DefaultMutableTreeNode shiNode;
DefaultMutableTreeNode xianNode;
DefaultMutableTreeNode xiangNode;
DefaultMutableTreeNode cunNode;
ArrayList<Unit> shengArrayList;
ArrayList<Unit> shiArrayList;
ArrayList<Unit> xianArrayList;
ArrayList<Unit> xiangArrayList;
ArrayList<Unit> cunArrayList;
UnitService unitService;
public TreeList(){
//窗体window化
try {
UIManager.setLookAndFeel( UIManager.getSystemLookAndFeelClassName());
}
catch ( Exception e ) {
System.out.println ("无法将界面设置为windows风格");
}
//调用初始化树形结构的方法
initTree();
}
public void initTree( ){
//根节点
node=new DefaultMutableTreeNode("目录树管理", true);
//获得树形结构
getTree(node);
//添加到树结构
jTree=new JTree(node,true);
//添加滚动条
JScrollPane jsp=new JScrollPane(jTree);
this.add(jsp);
//this.setSize(300,900);
//this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//this.setVisible(true);
}
public void getTree(DefaultMutableTreeNode node){
//调用servic方法
unitService=new UnitService();
//根据父编号获得所有数据
shengArrayList=unitService.getFatherId(null);
for(int i=0;i<shengArrayList.size();i++){
//获得省级节点
shengNode=new DefaultMutableTreeNode(shengArrayList.get(i).getUnit_name(), true);
//添加到根节点
node.add(shengNode);
//以市的的编号为父编号进行查询
shiArrayList=unitService.getFatherId(shengArrayList.get(i).getUnit_id());
for(int j=0;j<shiArrayList.size();j++){
//获得市级得节点
shiNode=new DefaultMutableTreeNode(shiArrayList.get(j).getUnit_name(), true);
shengNode.add(shiNode);//添加到根节点
xianArrayList=unitService.getFatherId(shiArrayList.get(j).getUnit_id());
for(int xian=0;xian<xianArrayList.size();xian++){
//获县节点
xianNode=new DefaultMutableTreeNode(xianArrayList.get(xian).getUnit_name(), true);
shiNode.add(xianNode);//添加到根节点
//以县编号为父编号查询乡的数据
xiangArrayList=unitService.getFatherId(xianArrayList.get(xian).getUnit_id());
for(int xiang=0;xiang<xiangArrayList.size();xiang++){
//获得乡的数据
xiangNode=new DefaultMutableTreeNode(xiangArrayList.get(xiang).getUnit_name(), true);
xianNode.add(xiangNode);//添加到根节点
//以乡编号作为父编号查询村级信息
cunArrayList=unitService.getFatherId(xiangArrayList.get(xiang).getUnit_id());
for(int cun=0;cun<cunArrayList.size();cun++){
//存在子节点
if(unitService.getCount(cunArrayList.get(i).getUnit_id())>0){
//获得村级
cunNode=new DefaultMutableTreeNode(cunArrayList.get(cun).getUnit_name(),true);
}else{//没有子节点
//获得村级
cunNode=new DefaultMutableTreeNode(cunArrayList.get(cun).getUnit_name(),false);
}
xiangNode.add(cunNode);//添加到根节点
}
}
}
}
}

}
public static void main(String[] args) {
new TreeList();

}

}
数据库操作的service类的重要方法：
/**
* 返回Unit的对象信息
* @param father_id【父编号】
* @return
*/
public ArrayList<Unit> getFatherId(String father_id){
this.father_id=father_id;
if(father_id!=null){
sql="select * from unit where father_id='"+father_id+"'";
}else{
sql="select * from unit where father_id is null";
}
rs=SqlHelper.executeQuery(sql,null);
ArrayList<Unit> lists = new ArrayList<Unit>();
Unit unit;
try {
while(rs.next()){
unit = new Unit();
unit.setFather_id(rs.getString(3));
unit.setUnit_name(rs.getString(2));
unit.setUnit_id(rs.getString(1));
lists.add(unit);
}
}catch(SQLException e){
e.printStackTrace();
}finally{
SqlHelper.close(rs, SqlHelper.getPs(), SqlHelper.getCt());
}
return lists;
}
/**
* 返回子节点的个数
* @param father_id【父编号】
* @return
*/
public int getCount(String father_id){
String sql = "select count(*) from unit where father_id='"+father_id+"'";
rs=SqlHelper.executeQuery(sql,null);
int count=0;
try{
while(rs.next()){
count = rs.getInt(1);
}
}catch(SQLException e){
e.printStackTrace();
}
finally{
SqlHelper.close(rs, SqlHelper.getPs(), SqlHelper.getCt());
}
return count;
}

评论

1 楼 javawang2012 2012-12-04  

如果是java web树就好了