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：
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}}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) list.get(i);assembleTreeList(tList);}return ((TreeMenu) tList.get(0)).getChildren();//去掉顶级节点}public void assembleTreeList(List list) {//对已经存在的list链进行循环遍历for (int i = 0; i < list.size(); i++) {TreeMenu treeMenu = (TreeMenu) list.get(i);// System.out.println("--" + treeMenu.getTreeMenuText());if (treeMenu.getTreeMenuId().equals(this.tm.getTreeMenuPid())) {//取得父子对应关系treeMenu.getChildren().add(this.tm);//挂载子}if (treeMenu.getChildren() != null) {assembleTreeList(treeMenu.getChildren());}}}}package com.project.layout.treemenu;import org.eclipse.jface.viewers.*;import java.util.List;public class TreeMenuContentProvider implements ITreeContentProvider {public Object[] getElements(Object inputElement) {if (inputElement instanceof List) {List input = (List) inputElement;return input.toArray();}return new Object[0];}public Object[] getChildren(Object parentElement) {TreeMenu tm = (TreeMenu) parentElement;List list = tm.getChildren();if (list == null) {return new Object[0];}return list.toArray();}public boolean hasChildren(Object element) {TreeMenu tm = (TreeMenu) element;List list = tm.getChildren();return !(list == null || list.isEmpty());}public Object getParent(Object element) {return null;}public void dispose() {}public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {}}package com.project.layout.treemenu;import org.eclipse.jface.viewers.*;import org.eclipse.swt.graphics.Image;public class TreeMenuLableProvider implements ILabelProvider {public Image getImage(Object element) {// ISharedImages sharedImages =// PlatformUI.getWorkbench().getSharedImages();// return sharedImages.getImage(ISharedImages.IMG_OBJS_WARN_TSK);return null;}public void dispose() {}public void addListener(ILabelProviderListener listener) {}/** * 显示什么文字 * * @param 结点 * @return 不能为null值 */public String getText(Object element) {return (String) ((TreeMenu)element).getTreeMenuText();}public boolean isLabelProperty(Object element, String property) {return false;}public void removeListener(ILabelProviderListener listener) {}}