实战Struts-Menu(3)

实战Struts-Menu(3)

 插入测试数据：

INSERT INTO menu_item
    (id ,  parent_name ,  name ,  title ,  titleCN ,  location)
VALUES
    ( 1 , null , 'DatabaseMenu' , 'Database Menu' , '数据库动态菜单' , null) ,
    ( 2 , 'DatabaseMenu' , 'Yahoo' , 'Yahoo Mail' , '雅虎邮件' , 'http://mail.yahoo.com') ,
    ( 3 , 'DatabaseMenu' , 'JavaBlogs' , 'JavaBlogs' , 'Java博客' , 'http://javablogs.com') ,
    ( 4 , null , 'StandaloneMenu' , 'Standalone Menu' , '独立的菜单' , 'http://www.sohu.com')

> 将数据库驱动程序放到lib目录中，并加入到Build Path，如MySQL的数据库驱动mysql-connector-java-3.1.8-bin.jar，解压缩commons- collections-3.1.zip，将commons-collections-3.1.jar释放到lib目录，并加入Build Path
  > 新建一个Struts的Action，代码如下：

package  cn.appex.menu;

import  java.io.UnsupportedEncodingException;
import  java.sql.Connection;
import  java.sql.DriverManager;
import  java.sql.PreparedStatement;
import  java.sql.ResultSet;
import  java.sql.SQLException;
import  java.util.ArrayList;
import  java.util.HashMap;
import  java.util.ListResourceBundle;
import  java.util.Map;

import  com.mysql.jdbc.Driver;

import  javax.servlet.http.HttpServletRequest;
import  javax.servlet.http.HttpServletResponse;
import  javax.servlet.http.HttpSession;

import  net.sf.navigator.menu.MenuComponent;
import  net.sf.navigator.menu.MenuRepository;
import  net.sf.navigator.menu.PermissionsAdapter;

import  org.apache.struts.action.Action;
import  org.apache.struts.action.ActionForm;
import  org.apache.struts.action.ActionForward;
import  org.apache.struts.action.ActionMapping;

public   class  MenuAction  extends  Action {
     public  ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
             throws  Exception {
        buildMenuRepository(request);
        buildMenuResourceBundle(request);
        buildMenuPermissions(request);
         return  (mapping.findForward( " success " ));
    }

     /**
     * 创建菜单数据结构
     * 
     *  @param  request
      */
     private   void  buildMenuRepository(HttpServletRequest request) {
        MenuRepository repository  =   new  MenuRepository();
         //  Get the repository from the application scope - and copy the
         //  DisplayerMappings from it.
        MenuRepository defaultRepository  =  (MenuRepository) request
                .getSession().getServletContext().getAttribute(
                        MenuRepository.MENU_REPOSITORY_KEY);
        repository.setDisplayers(defaultRepository.getDisplayers());

        Map[] menus  =  getMenuComponents();
         for  ( int  i = 0 ; i  <  menus.length; i ++ ) {
            MenuComponent mc  =   new  MenuComponent();
            Map row  =  menus[i];
            String name  =  (String) row.get( " name " );
            mc.setName(name);
            String parent  =  (String) row.get( " parent_name " );
            System.out.println(name  +   " , parent is:  "   +  parent);
             if  (parent  !=   null ) {
                MenuComponent parentMenu  =  repository.getMenu(parent);
                 if  (parentMenu  ==   null ) {
                    System.out.println( " parentMenu ' "   +  parent  +   " ' doesn't exist! " );
                     //  create a temporary parentMenu
                    parentMenu  =   new  MenuComponent();
                    parentMenu.setName(parent);
                    repository.addMenu(parentMenu);
                }

                mc.setParent(parentMenu);
            }
            String title  =  (String) row.get( " title " );
            mc.setTitle(title);
            String location  =  (String) row.get( " location " );
            mc.setLocation(location);
            String description  =  (String) row.get( " description " );
            mc.setDescription(description);
            repository.addMenu(mc);
        }
        
        request.setAttribute( " examplesRepository " , repository);
    }