SWT/JFace从数据库表生成treeviewer所需要的内容（list对象）
网上关于SWT/JFace的Treeviewer应用的文章有很多，值得推荐的是：http://www.cnblogs.com/huqingyu/archive/2008/04/10/1146209.html
，但是至于如何从数据库中获得TreeMenuContentProvider所需要的树状list，没有太多实例，下面是我写的一个例子，供大家参考：
共分为以下几步：
一、创建数据库表tree_menu_t(tree_menu_id,tree_menu_text,tree_menu_pid,tree_menu_action);
并填充数据
举例：

tree_menu_id	tree_menu_text	tree_menu_pid	tree_menu_action
1	系统设置	0	null
2	用户设置	1	user_action
3	角色设置	1	role_action
4	权限设置	1	privilege_action
5	业务模块	0	null
6	销售管理	5	sale_action

创建对应类：

package com.project.layout.treemenu;

import java.util.*;

import com.bsm.user.User;

public class TreeMenu {
	private String treeMenuId;
	private String treeMenuPid;
	private String treeMenuText;
	private String treeMenuAction;
	private List children = new ArrayList();

	public TreeMenu(String treeMenuId, String treeMenuPid,String treeMenuText,String treeMenuAction, ArrayList children) {
		this.treeMenuId = treeMenuId;
		this.treeMenuPid = treeMenuPid;
		this.treeMenuText = treeMenuText;
		this.treeMenuAction = treeMenuAction;
		this.children = children;
	}

	public String getTreeMenuAction() {
		return treeMenuAction;
	}

	public void setTreeMenuAction(String treeMenuAction) {
		this.treeMenuAction = treeMenuAction;
	}

	public TreeMenu() {

	}

	public String getTreeMenuId() {
		return treeMenuId;
	}

	public void setTreeMenuId(String treeMenuId) {
		this.treeMenuId = treeMenuId;
	}

	public String getTreeMenuPid() {
		return treeMenuPid;
	}

	public void setTreeMenuPid(String treeMenuPid) {
		this.treeMenuPid = treeMenuPid;
	}

	public String getTreeMenuText() {
		return treeMenuText;
	}

	public void setTreeMenuText(String treeMenuText) {
		this.treeMenuText = treeMenuText;
	}

	public List getChildren() {
		return children;
	}

	public void setChildren(List children) {
		this.children = children;
	}
}

第二步：创建DAO，获取对应数据list

package com.project.layout.treemenu;

import java.util.ArrayList;
import java.util.List;
public class TreeMenuDAO {
	public List getTreeMenuList() {
		String sql = "SELECT TREE_MENU_ID , TREE_MENU_TEXT , TREE_MENU_PID , TREE_MENU_ACTION FROM TREE_MENU_T ORDER BY TREE_MENU_PID,TREE_MENU_ID;";
		
 list = new ArrayList();
//具体取语句就不多说了，因为关于从表中取得数据的实例太多了，各个人又个人的不同实现方法
    treeMenu = new TreeMenu();
    treeMenu.setTreeMenuId(s[i][j++]);
    treeMenu.setTreeMenuText(s[i][j++]);
    treeMenu.setTreeMenuPid(s[i][j++]);
    treeMenu.setTreeMenuAction(s[i][j++]);
    list.add(treeMenu);
    return list;//返回list对象
	}
}

第三步：拼装成链状list

package com.project.layout.treemenu;

import com.bsm.user.User;
import java.util.List;
import java.util.ArrayList;

public class TreeMenuBO {
	private TreeMenu tm = new TreeMenu();
	private List tList = new ArrayList();
	public List getTreeViewList() {
		TreeMenu treeMenu = new TreeMenu();
		TreeMenuDAO dao = new TreeMenuDAO();
		List list = dao.getTreeMenuList();
		this.tm = new TreeMenu("0", "0", "root", "", new ArrayList());// 设置顶级元素，为了便于子list的挂载，在返回时候，去掉
		tList.add(tm);

		for (int i = 0; i < list.size(); i++) {
			this.tm = (TreeMenu) li