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通过 Adob​​e SocketServer 代码示例将对象和字符串从客户端应用程序发送到服务器应用程序。

在我看到的 sendStrings 方法中

var bytes:ByteArray=new ByteArray();
            bytes.writeInt(TYPE_STRING); //message type
            bytes.writeObject(text);
            bytes.position=0;

但是，如果要发送字符串数据，为什么要转换为字节呢？谁能解释序列化字符串数据的优势？

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1 回答 1

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我想这只是 Adob​​e SocketServer 的协议要求。对于单个对象，AMF 与 String 相比没有优势，因为它还对字符串使用 UTF：

package
{
import flash.display.Sprite;
import flash.utils.ByteArray;

public class astest extends Sprite
{
    public function astest()
    {
        var str:String = "sdfKdkhsdfn345k4jhskdfhsdkf34k,,mancoasdc2";

        var bytesUTF:ByteArray = new ByteArray();
        bytesUTF.writeUTF(str);

        var bytesAMF:ByteArray = new ByteArray();
        bytesAMF.writeObject(str);

        var hexUTF:String = getHexBytesString(bytesUTF);
        var hexAMF:String = getHexBytesString(bytesAMF);
        trace("hexUTF:", hexUTF, bytesUTF.length, "bytes");
        trace("hexAMF:", hexAMF, bytesAMF.length, "bytes");

        trace(hexUTF.substr(4) == hexAMF.substr(4));

    }

    public static function getHexBytesString(array:ByteArray, colons:Boolean=false, position:int = 0):String {
        var s:String = "";
        var len:uint = array.length;
        for (var i:int=position;i<len;i++) {
            s+=("0"+array[i].toString(16)).substr(-2,2).toUpperCase();
            if (colons && i<array.length-1) s+= "-";
        }
        return s;
    }

}
}

输出：

hexUTF: 002A7364664B646B687364666E3334356B346A68736B64666873646B6633346B2C2C6D616E636F6173646332 44 bytes
hexAMF: 06557364664B646B687364666E3334356B346A68736B64666873646B6633346B2C2C6D616E636F6173646332 44 bytes
true

但总的来说，如果您要写入两次相同的字符串，因为 AMF 使用对一个对象的 equals 字符串的引用，则AMF ( writeObject) 与 String ( )的结果字节大小可能会有优势：writeUTF

package
{
import flash.display.Sprite;
import flash.utils.ByteArray;

public class astest extends Sprite
{
    public function astest()
    {
        var str:String = "sdfKdkhsdfn345k4jhskdfhsdkf34k,,mancoasdc2";

        var bytesUTF:ByteArray = new ByteArray();
        bytesUTF.writeUTF(str);
        bytesUTF.writeUTF(str);

        var bytesAMF:ByteArray = new ByteArray();
        bytesAMF.writeObject({str1:str, str2:str});

        var hexUTF:String = getHexBytesString(bytesUTF);
        var hexAMF:String = getHexBytesString(bytesAMF);
        trace("hexUTF:", hexUTF, bytesUTF.length, "bytes");
        trace("hexAMF:", hexAMF, bytesAMF.length, "bytes");

        trace(hexUTF.substr(4) == hexAMF.substr(4));

    }

    public static function getHexBytesString(array:ByteArray, colons:Boolean=false, position:int = 0):String {
        var s:String = "";
        var len:uint = array.length;
        for (var i:int=position;i<len;i++) {
            s+=("0"+array[i].toString(16)).substr(-2,2).toUpperCase();
            if (colons && i<array.length-1) s+= "-";
        }
        return s;
    }

}
}

输出：

hexUTF: 002A7364664B646B687364666E3334356B346A68736B64666873646B6633346B2C2C6D616E636F6173646332002A7364664B646B687364666E3334356B346A68736B64666873646B6633346B2C2C6D616E636F6173646332 88 bytes
hexAMF: 0A0B01097374723206557364664B646B687364666E3334356B346A68736B64666873646B6633346B2C2C6D616E636F61736463320973747231060201 60 bytes
false
于 2013-03-01T07:39:12.723 回答