RIA Argsmy blog,but share with you~AboutGuestBook-AS3的Base64编码和解码Posted by wpm on Aug 26, 2011 in ActionScript, Articles, Flash, Tutorials 最近要做一个将flash截的图传给js显示的功能，然后需要解决将图片数据转换成Base64编码格式，同事帮忙在网上找到了这个很有用的Base64编码和解码的类。很好用。记录一下。参考链接：http://www.cordyblog.cn/?action=show&id=49调用代码：import com.dynamicflash.utils.Base64;//编码和解码字符串var source:String = "Hello, world";var encoded:String = Base64.encode(source);trace(encoded);var decoded:String = Base64.decode(encoded);trace(decoded);//编码和解码ByteArrayvar obj:Object= {name:"Dynamic Flash",url:"http://dynamicflash.com"};var source:ByteArray = new ByteArray();source.writeObject(obj);var encoded:String = Base64.encodeByteArray(source);trace(encoded);var decoded:ByteArray = Base64.decodeToByteArray(encoded);obj = decoded.readObject();trace(obj.name + "(" + obj.url + ")");Base64类代码：package com.dynamicflash.util{   import flash.utils.ByteArray;   public class Base64 {   private static const BASE64_CHARS:String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";   public static const version:String = "1.0.0";   public static function encode(data:String):String {// Convert string to ByteArrayvar bytes:ByteArray = new ByteArray();bytes.writeUTFBytes(data);   // Return encoded ByteArrayreturn encodeByteArray(bytes);}   public static function encodeByteArray(data:ByteArray):String {// Initialise outputvar output:String = "";   // Create data and output buffersvar dataBuffer:Array;var outputBuffer:Array = new Array(4);   // Rewind ByteArraydata.position = 0;   // while there are still bytes to be processedwhile (data.bytesAvailable > 0) {// Create new data buffer and populate next 3 bytes from datadataBuffer = new Array();for (var i:uint = 0; i < 3 && data.bytesAvailable > 0; i++) {dataBuffer[i] = data.readUnsignedByte();}   // Convert to data buffer Base64 character positions and// store in output bufferoutputBuffer[0] = (dataBuffer[0] & 0xfc) >> 2;outputBuffer[1] = ((dataBuffer[0] & 0x03) << 4) | ((dataBuffer[1]) >> 4);outputBuffer[2] = ((dataBuffer[1] & 0x0f) << 2) | ((dataBuffer[2]) >> 6);outputBuffer[3] = dataBuffer[2] & 0x3f;   // If data buffer was short (i.e not 3 characters) then set// end character indexes in data buffer to index of '=' symbol.// This is necessary because Base64 data is always a multiple of// 4 bytes and is basses with '=' symbols.for (var j:uint = dataBuffer.length; j < 3; j++) {outputBuffer[j + 1] = 64;}   // Loop through output buffer and add Base64 characters to// encoded data string for each character.for (var k:uint = 0; k < outputBuffer.length; k++) {output += BASE64_CHARS.charAt(outputBuffer[k]);}}   // Return encoded datareturn output;}   public static function decode(data:String):String {// Decode data to ByteArrayvar bytes:ByteArray = decodeToByteArray(data);   // Convert to string and returnreturn bytes.readUTFBytes(bytes.length);}   public static function decodeToByteArray(data:String):Byte