实战Struts-Menu（4)

实战Struts-Menu（4)

/**
     * 从数据库中读取菜单配置信息
     * 
     *  @return
      */
     private  Map[] getMenuComponents() {
        ArrayList list  =   new  ArrayList();
        Connection conn  =   null ;
        PreparedStatement pstmt  =   null ;
        ResultSet rest  =   null ;
        String sql  =   " select name,parent_name,title,location,description from menu_item order by id " ;
         try  {
            Class.forName( " com.mysql.jdbc.Driver " ).newInstance();
            conn  =  DriverManager.getConnection( " jdbc:mysql://localhost/myexamples?user=root&password=mywangya&useUnicode=true&characterEncoding=UTF-8 " );
            pstmt  =  conn.prepareStatement(sql);
            rest  =  pstmt.executeQuery();
             while  (rest.next()) {
                 int  i  =   1 ;
                HashMap map  =   new  HashMap();
                map.put( " name " , rest.getString(i ++ ));
                map.put( " parent_name " , rest.getString(i ++ ));
                map.put( " title " , rest.getString(i ++ ));
                map.put( " location " , rest.getString(i ++ ));
                map.put( " description " , rest.getString(i ++ ));
                list.add(map);
            }
        }  catch  (SQLException ex) {
            ex.printStackTrace();
        }  catch  (InstantiationException e) {
            e.printStackTrace();
        }  catch  (IllegalAccessException e) {
            e.printStackTrace();
        }  catch  (ClassNotFoundException e) {
            e.printStackTrace();
        }  finally  {
             try  {
                 if  ( null != rest) rest.close();
                 if  ( null != pstmt) pstmt.close();
                 if  ( null != conn) conn.close();
            }  catch  (SQLException e) {
                e.printStackTrace();
            }
        }
        
         return  (Map[]) list.toArray( new  HashMap[ 0 ]);
    }
    
     /**
     * 构造菜单权限
     * 
     *  @param  request
      */
     private   void  buildMenuPermissions(HttpServletRequest request) {
        PermissionsAdapter permession  =   new  PermissionsAdapter() {
             public   boolean  isAllowed(MenuComponent menu) {
                 //  名称等于StandaloneMenu的菜单不显示
                 return   ! " StandaloneMenu " .equalsIgnoreCase(menu.getName());
            }
        };
        request.setAttribute( " examplesPermession " , permession);
    }

     /**
     * 构造菜单显示标题
     * 
     *  @param  request
      */
     private   void  buildMenuResourceBundle(HttpServletRequest request) {
        MenuResourceBundle resourceBundle  =   new  MenuResourceBundle();
        request.setAttribute( " examplesBundle " , resourceBundle);
    }
    
     /**
     * MenuResourceBundle树状菜单国际语言显示
     * 
     *  @author  wenbin.zhang
     *  
      */
     class  MenuResourceBundle  extends  ListResourceBundle {
         private  ArrayList list  =   new  ArrayList();

         public  MenuResourceBundle() {
            Connection conn  =   null ;
            PreparedStatement pstmt  =   null ;
            ResultSet rest  =   null ;
            String sql  =   " select title,titleCN from menu_item order by id " ;
             try  {
                Class.forName( " com.mysql.jdbc.Driver " ).newInstance();
                conn  =  DriverManager.getConnection( " jdbc:mysql://localhost/myexamples?user=root&password=mywangya&useUnicode=true&characterEncoding=UTF-8 " );
                pstmt  =  conn.prepareStatement(sql);
                rest  =  pstmt.executeQuery();
                 while  (rest.next()) {
                     int  i  =   1 ;
                    String[] message  =   new  String[ 2 ];
                    message[ 0 ]  =  rest.getString(i ++ );
                     try  {
                        message[ 1 ]  =   new  String(rest.getString(i ++ ).getBytes( " latin1 " ),  " gbk " );
                    }  catch  (UnsupportedEncodingException e) {
                        e.printStackTrace();
                    }
                     if  (message[ 0 ]  !=   null   &&  message[ 1 ]  !=   null ) {
                        list.add(message);
                    }
                }
            }  catch  (SQLException ex) {
                ex.printStackTrace();
            }  catch  (InstantiationException e) {
                e.printStackTrace();
            }  catch  (IllegalAccessException e) {
                e.printStackTrace();
            }  catch  (ClassNotFoundException e) {
                e.printStackTrace();
            }  finally  {
                 try  {
                     if  ( null != rest) rest.close();
                     if  ( null != pstmt) pstmt.close();
                     if  ( null != conn) conn.close();
                }  catch  (SQLException e) {
                    e.printStackTrace();
                }
            }

        }

         public  Object[][] getContents() {
             return  (String[][]) list.toArray( new  String[ 0 ][ 0 ]);
        }
    }
}

> 将struts-config.xml文件的<action-mappings />部分修改为：

< action-mappings >
   < action  path ="/menuAction"  type ="cn.appex.menu.MenuAction"   >
     < forward  name ="success"  path ="/struts-menu/dynamic-menu.jsp"   />
   </ action >
</ action-mappings >