flex上传图片

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flex上传图片需引用UploadPostHelper.as

protected function btnClick(event:MouseEvent):void
            {
                //要上传的图片
                var one4data:Bitmap= model.scanvo.currentScanImage;
                //图片转换成字符数组
                //对传送数据编码(很重要)
                var data:ByteArray=new JPGEncoder().encode(one4data.bitmapData);

                var url:String="http://www.test.com/upload/UploadAction.action";//上传地址自己根据实际情况定
                var request:URLRequest=new URLRequest(url);
                //form表单提交，同时声明分隔符boundary
                request.contentType="multipart/form-data; boundary="+UploadPostHelper.getBoundary();
                request.requestHeaders.push(new URLRequestHeader( 'Cache-Control', 'no-cache'));
                request.method=URLRequestMethod.POST;
                //设置上传文件名和上传数据

                //getPostData()方法主要是根据RFC1867来处理数据
                request.data=UploadPostHelper.getPostData("test.jpg",data);

                var loader:URLLoader = new URLLoader();
                loader.dataFormat=URLLoaderDataFormat.BINARY;
                loader.addEventListener(Event.COMPLETE, onComplete);
                loader.addEventListener(IOErrorEvent.IO_ERROR,onIOErr);
                loader.addEventListener(SecurityErrorEvent.SECURITY_ERROR,onSecurity);
                loader.load(request);
            }

-----------------------

UploadPostHelper.as

package fx.util
{
    import flash.events.*;
    import flash.net.*;
    import flash.utils.ByteArray;
    import flash.utils.Endian;

    /**
    * Take a fileName, byteArray, and parameters object as input and return ByteArray post data suitable for a UrlRequest as output
    *
    * @see http://marstonstudio.com/?p=36
    * @see http://www.w3.org/TR/html4/interact/forms.html
    * @see http://www.jooce.com/blog/?p=143
    * @see http://www.jooce.com/blog/wp%2Dcontent/uploads/2007/06/uploadFile.txt
    * @see http://blog.je2050.de/2006/05/01/save-bytearray-to-file-with-php/
    *
    * @author Jonathan Marston
    * @version 2007.08.19
    *
    * This work is licensed under a Creative Commons Attribution NonCommercial ShareAlike 3.0 License.
    * @see http://creativecommons.org/licenses/by-nc-sa/3.0/
    *
    */
    public class UploadPostHelper {

        /**
        * Boundary used to break up different parts of the http POST body
        */
        private static var _boundary:String = "";

        /**
        * Get the boundary for the post.
        * Must be passed as part of the contentType of the UrlRequest
        */
        public static function getBoundary():String {

            if(_boundary.length == 0) {
                for (var i:int = 0; i < 0x20; i++ ) {
                    _boundary += String.fromCharCode( int( 97 + Math.random() * 25 ) );
                }
            }

            return _boundary;
        }

        /**
        * Create post data to send in a UrlRequest
        * @param fileName:String 上传文件的名字 "xxx.txt/xxx.jpg/xxx.pdf"
        * @param byteArray:ByteArray 上传文件的文件内容
        * @param uploadDataFieldName:String 上传数据字段的名字默认值=filedata
        * @param parameters:Object 参数默认值=null
        */
        public static function getPostData(fileName:String, byteArray:ByteArray, uploadDataFieldName:String = "filedata", parameters:Object = null):ByteArray {

            var i: int;
            var bytes:String;

            var postData:ByteArray = new ByteArray();
            //更改或读取数据的字节顺序
            postData.endian = Endian.BIG_ENDIAN;

            //add Filename to parameters
            if(parameters == null) {
                parameters = new Object();
            }
            //设置上传文件名到parameters里
            parameters.Filename = fileName;

            //遍历parameters中的属性
            //add parameters to postData
            for(var name:String in parameters) {
                postData = BOUNDARY(postData);
                postData = LINEBREAK(postData);
                bytes = 'Content-Disposition: form-data; name="' + name + '"';
                for ( i = 0; i < bytes.length; i++ ) {
                    postData.writeByte( bytes.charCodeAt(i) );
                }
                postData = LINEBREAK(postData);
                postData = LINEBREAK(postData);
                postData.writeUTFBytes(parameters[name]);
                postData = LINEBREAK(postData);
            }

            //add Filedata to postData
            postData = BOUNDARY(postData);
            postData = LINEBREAK(postData);
            bytes = 'Content-Disposition: form-data; name="'+uploadDataFieldName+'"; filename="';
            for ( i = 0; i < bytes.length; i++ ) {
                postData.writeByte( bytes.charCodeAt(i) );
            }
            postData.writeUTFBytes(fileName);
            postData = QUOTATIONMARK(postData);
            postData = LINEBREAK(postData);
            bytes = 'Content-Type: application/octet-stream';
            for ( i = 0; i < bytes.length; i++ ) {
                postData.writeByte( bytes.charCodeAt(i) );
            }
            postData = LINEBREAK(postData);
            postData = LINEBREAK(postData);
            postData.writeBytes(byteArray, 0, byteArray.length);
            postData = LINEBREAK(postData);

            //add upload filed to postData
            postData = LINEBREAK(postData);
            postData = BOUNDARY(postData);
            postData = LINEBREAK(postData);
            bytes = 'Content-Disposition: form-data; name="Upload"';
            for ( i = 0; i < bytes.length; i++ ) {
                postData.writeByte( bytes.charCodeAt(i) );
            }
            postData = LINEBREAK(postData);
            postData = LINEBREAK(postData);
            bytes = 'Submit Query';
            for ( i = 0; i < bytes.length; i++ ) {
                postData.writeByte( bytes.charCodeAt(i) );
            }
            postData = LINEBREAK(postData);

            //closing boundary
            postData = BOUNDARY(postData);
            postData = DOUBLEDASH(postData);

            return postData;
        }

        /**
        * Add a boundary to the PostData with leading doubledash 添加以双破折号开始的分隔符
        */
        private static function BOUNDARY(p:ByteArray):ByteArray {
            var l:int = UploadPostHelper.getBoundary().length;

            p = DOUBLEDASH(p);
            for (var i:int = 0; i < l; i++ ) {
                p.writeByte( _boundary.charCodeAt( i ) );
            }
            return p;
        }

        /**
        * Add one linebreak 添加空白行
        */
        private static function LINEBREAK(p:ByteArray):ByteArray {
            p.writeShort(0x0d0a);
            return p;
        }

        /**
        * Add quotation mark 添加引号
        */
        private static function QUOTATIONMARK(p:ByteArray):ByteArray {
            p.writeByte(0x22);
            return p;
        }

        /**
        * Add Double Dash 添加双破折号--
        */
        private static function DOUBLEDASH(p:ByteArray):ByteArray {
            p.writeShort(0x2d2d);
            return p;
        }

    }

}