通过剪贴板，带导入导出excel文件的datagrid

本文绝对参考
http://hi.baidu.com/%CA%AF%CD%B7%B5%C4%B1%A6%B1%A6/blog/item/96592ed3c2b304003bf3cf46.html

package com.yyhy.flex.util
{
	import flash.events.KeyboardEvent;
	import flash.events.TextEvent;
	import flash.text.TextField;
	import flash.text.TextFieldType;
	
	import mx.controls.*;
	import mx.controls.dataGridClasses.DataGridColumn;
    //import mx.events.
	public class EIDataGrid extends DataGrid
	{
		public function EIDataGrid()
		{
			super();
			this.addEventListener(KeyboardEvent.KEY_DOWN,KeyDownHandler);
			this.addEventListener(KeyboardEvent.KEY_UP,KeyUpHandler);
		}
		private function KeyDownHandler(event:KeyboardEvent):void
   			{
	     		if (event.ctrlKey && !this.getChildByName("clipboardProxy"))
	     		{
	       			// Add an invisible TextField object to the DataGrid
	       			var textField:TextField = new TextField();
	       			textField.name = "clipboardProxy";
	       			this.addChild(textField);
	       			textField.visible = false;
	
	       			textField.type = TextFieldType.INPUT;
	       			textField.multiline = true;
	
	       			// Populate the TextField with selected data in TSV format
	
	       			textField.text = getTextFromItems(this.selectedItems);
	       			//textField.text = getTextFromItems(dataGrid.dataProvider.source);
	       			textField.setSelection(0, textField.text.length - 1);
	
	       			// Listen for textInput event
	
	       			textField.addEventListener(TextEvent.TEXT_INPUT,
	           		clipboardProxyPasteHandler);
	
	       			// Set player-level focus to the TextField
	
	       			systemManager.stage.focus = textField;
	     		}//end if
	   		}//end function


	   		private function KeyUpHandler(event:KeyboardEvent):void
	   		{
	     		if (!event.ctrlKey)
	     		{
	       			var textField:TextField = TextField(this.getChildByName("clipboardProxy"));
	       			if (textField)
	       			{
	         			this.removeChild(textField);
	         		}//end if
	     		}//end if
	   		}//end function

	   		private function clipboardProxyPasteHandler(event:TextEvent):void
	   		{
	     		// Extract values from TSV format and populate the DataGrid
	
	     		var items:Array = getItemsFromText(event.text);
	     		for each (var item:Object in items)
	       			this.dataProvider.addItem(item);
	   		}//end function

	   		private function getItemsFromText(text:String):Array
	   		{
	     		var rows:Array = text.split("\n");
	     		if (!rows[rows.length - 1])
	       			rows.pop();
	
	     		var columns:Array = this.columns;
	     		var itemsFromText:Array = [];
	
	     		for each (var rw:String in rows)
	     		{
	       			var fields:Array = rw.split("\t");
	
	       			var n:int = Math.min(columns.length, fields.length);
	       			var item:Object = {};
	       			for (var i:int = 0; i < n; i++)
	         			item[columns[i].dataField] = fields[i];
	       			itemsFromText.push(item);
	    		 }
	
	     		return itemsFromText;  
	   		}//end function
		private function getTextFromItems(items:Array):String
	   		{
	     		var columns:Array = this.columns;
	     		var textFromItems:String = "";
		   		//add datagrid headtext	
	   			for each (var i: DataGridColumn in columns)
	     		{
	         		textFromItems += i.headerText + "\t";
	         	}
	       		textFromItems += "\n";
	       			
	     		for each (var it:Object in items)
	     		{
	     			
	       			for each (var c: DataGridColumn in columns)
	         			textFromItems += it[c.dataField] + "\t";
	       			textFromItems += "\n";
	     		}
	
	     		return textFromItems;
	   		}//end function
	}
}