用FLEX实现屏幕快照及下载

代码:

public function printMap():void{
var en:JPEGEncoder = new JPEGEncoder(100); //压缩图片，100是指质量
var ba:ByteArray=en.encode(ImageSnapshot.captureBitmapData(this.parent.parent));//将控件转为BitmapData后再转为ByteArray
var request:URLRequest = new URLRequest(”http://localhost:8080/servlet/upload.jsp”);
request.method=”POST”;
request.data=ba;
request.contentType = “application/octet-stream”;
navigateToURL(request,”_blank”); //因为要浏览器触发下载事件，所以就不用异步方式打开连接了
}
upload.jsp代码（如果把application/x-download改成image/jpeg就可以不弹出保存提示框了）
代码:
<%@page language="java” contentType=”application/x-download” import=”java.io.*,java.net.*” pageEncoding=”gb2312″%><%
response.setContentType(”application/x-download”); //内容是下载
response.setHeader(”Content-Disposition”,”attachment;filename=” + “test.jpg”);//文件名，可以进一步处理
//读数据
BufferedInputStream inputStream = new BufferedInputStream(request.getInputStream());
//FileOutputStream outputStream = new FileOutputStream(new File(filePath));
OutputStream outputStream = response.getOutputStream();
byte [] bytes = new byte[1024];
int v;
//写数据
while((v=inputStream.read(bytes))>0){
outputStream.write(bytes,0,v);
}
outputStream.flush();
outputStream.close();
inputStream.close();
%>