Flex导出Excel

/****
*  导出excel的方法
* */
private function exportExcel():void{
ExportExcel.loadDGInExcel(this.dataGrid,'ExcelExport.jsp');
}

<mx:DataGrid id="dataGrid" allowMultipleSelection="true"   selectable="true" verticalScrollPolicy="on" x="0" y="0" width="100%"  doubleClickEnabled="true" itemDoubleClick="dataGridDoubleClick(event)" height="85%" dataProvider="{attributeDefineList}" textAlign="center" >
<mx:columns>
<mx:DataGridColumn headerText="属性类型ID" dataField="typeDescription"/>
<mx:DataGridColumn headerText="原子属性" dataField="ifatom" labelFunction="yesNoVerdict" />
<mx:DataGridColumn headerText="依赖考试生成" dataField="ifrelytestcreate" labelFunction="yesNoVerdict"  />
<mx:DataGridColumn headerText="依赖考试过滤" dataField="ifrelytestfilter" labelFunction="yesNoVerdict" />
<mx:DataGridColumn headerText="属性内部代码" dataField="adcode"/>
<mx:DataGridColumn headerText="属性业务编码" dataField="adbcode"/>
<mx:DataGridColumn headerText="名称" dataField="name"/>
<mx:DataGridColumn headerText="简称" dataField="shortname"/>
<mx:DataGridColumn headerText="多/单根节点" dataField="ifsinglenode" labelFunction="yesNoVerdict" />
<mx:DataGridColumn headerText="有无具体值" dataField="isvalue" labelFunction="yesNoVerdict" />
<mx:DataGridColumn headerText="实现方法" dataField="implementation"/>
<mx:DataGridColumn headerText="操作" itemRenderer="ui.form.ufmDTAttrDefineOper"  />
</mx:columns>
</mx:DataGrid>

package util
{
import flash.errors.*;
import flash.events.*;
import flash.external.*;
import flash.net.URLRequest;
import flash.net.URLRequestMethod;
import flash.net.URLVariables;
import flash.net.navigateToURL;

import mx.controls.Alert;
import mx.controls.DataGrid;
import mx.controls.dataGridClasses.DataGridColumn;

public class ExportExcel
{
public function ExportExcel()
{
}
/** 在导出数据的时候有可能出现单元格数据长度过长而导致Excel在显示时
*  出现科学计数法或者#特殊符号，在此设置单元格宽度比例WIDTHSCALE，在
*  代码中每个单元格的宽度扩展适当的比例值WIDTHSCALE。
*/
private static var WIDTHSCALE:Number=2.0;

/**
* 将DataGrid转换为htmltable
* @author rentao
* @param: dg 需要转换成htmltable的DataGrid
* @return: String
*/
private static function convertDGToHTMLTable(dg:DataGrid):String {
//设置默认的DataGrid样式
var font:String = dg.getStyle('fontFamily');
var size:String = dg.getStyle('fontSize');
var str:String = '';
var colors:String = '';
var style:String = 'style="font-family:'+font+';font-size:'+size+'pt;"';
var hcolor:Array;

//检索DataGrid的 headercolor
if(dg.getStyle("headerColor") != undefined) {
hcolor = [dg.getStyle("headerColor")];
} else {
hcolor = dg.getStyle("headerColors");
}

//			Alert.show(hcolor+"");
var x :String = "" ;
if(hcolor == null){
x = "0x323232" ;
}else{
x = Number((hcolor[0])).toString(16);
}
//			str+= '<table width="'+dg.width+'" border="1"><thead><tr width="'+dg.width+'" style="background-color:#' +Number((hcolor[0])).toString(16)+'" mce_style="background-color:#' +Number((hcolor[0])).toString(16)+'">';
str+= '<table align="center" width="'+dg.width+'" border="1"><thead><tr width="'+dg.width+'" style="background-color:#' +x+'" mce_style="background-color:#' +x+'">';

//设置tableheader数据(从datagrid的header检索headerText信息)
for(var i:int = 0;i<dg.columns.length;i++) {
colors = dg.getStyle("themeColor");

if(dg.columns[i].dataField == null || dg.columns[i].dataField == ""){}else{ //表示不是操作列
if(dg.columns[i].headerText != undefined) {
str+="<th "+style+">"+dg.columns[i].headerText+"</th>";
} else {
str+= "<th "+style+">"+dg.columns[i].dataField+"</th>";
}
}

}
str += "</tr></thead>";
colors = dg.getStyle("alternatingRowColors");

for(var j:int =0;j<dg.dataProvider.length;j++) {
str+="<tr width=/""+Math.ceil(dg.width)+"/">";

for(var k:int=0; k < dg.columns.length; k++) {

if(dg.dataProvider.getItemAt(j) != undefined && dg.dataProvider.getItemAt(j) != null) {
if((dg.columns[k] as DataGridColumn).dataField == null || (dg.columns[k] as DataGridColumn).dataField == ""){}else{   //表示的是字段列
if((dg.columns[k] as DataGridColumn).labelFunction != undefined) {
var dataGridColumn:DataGridColumn = dg.columns[k] as DataGridColumn ;
//							str += "<td width=/""+Math.ceil((dg.columns[k] as DataGridColumn).width*WIDTHSCALE)+"/" "+style+">"+(dg.columns[k] as DataGridColumn).labelFunction(dg.dataProvider.getItemAt(j),dg.columns[k].dataField)+"</td>";
str += "<td align='center' width=/""+Math.ceil(dataGridColumn.width*WIDTHSCALE)+"/" "+style+">"+dataGridColumn.labelFunction(dg.dataProvider.getItemAt(j),dataGridColumn)+"</td>";
//							//"+dg.columns[k].labelFunction(dg.dataProvider.getItemAt(j),dg.columns[k].dataField)+"
} else {
str += "<td align='center' width=/""+Math.ceil(dg.columns[k].width*WIDTHSCALE)+"/" "+style+">"+dg.dataProvider.getItemAt(j)[(dg.columns[k] as DataGridColumn).dataField]+"</td>";
}
}
}
}
str += "</tr>";
}
str+="</table>";

return str;
}

/**
* 将制定的DataGrid加载到Excel文件，此方法传入一个htmltable字符串参数到后台Script脚本，然后浏览器给用户提供一个Excel下载
* @author Chenwenfeng
* @params dg 需要导入的数据源DataGrid
* @params url excel文件下载路径
*/
public static function loadDGInExcel(dg:DataGrid,url:String):void {

//设置URLVariables参数变量，动态增加属性htmltable
var variables:URLVariables = new URLVariables();
variables.htmltable = convertDGToHTMLTable(dg);

var u:URLRequest = new URLRequest(url);
u.data = variables;
u.method = URLRequestMethod.POST;

navigateToURL(u,"_self");
//"_self" 指定当前窗口中的当前帧。
//"_blank" 指定一个新窗口。
//"_parent" 指定当前帧的父级。
//"_top" 指定当前窗口中的顶级帧。
}
}
}

<%@ page language="java"%>
<%@ page contentType="application/msexcel;charset=UTF-8"
pageEncoding="UTF-8"%>
<%
request.setCharacterEncoding("UTF-8");
response.setHeader("Content-disposition","attachment; filename=excel.xls");
String str = request.getParameter("htmltable");
out.print(str);
%>

<%@ page contentType="text/html; charset=GBK" %>
<% response.setContentType("application/msexcel;charset=UTF-8"); %>
<HTML>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<head><title>Test</title></head>
<body>
<%
request.setCharacterEncoding("UTF-8");
response.setHeader("Content-disposition","attachment; filename=excel.xls");
String str = request.getParameter("htmltable");
out.print(str);
%>
</body>
</HTML>