跨平台base64字节数组编码

时间:2017-02-05 09:57:25

标签: javascript android arrays base64

我有一个字节数组,我在Android设备上生成,编码为base64,发送到服务器,然后使用JavaScript在Web上显示。但是字节数组不匹配。

示例字节数组:

-39,86,-91,26,77,98,-3,108,83,-108,-53,-8,-102,-39,-42,-106,-90,70,122,26,43,-46,82,124,-4,-116,-51,-92,100,-104,57,9,-127,0

android side encoding:

import android.util.Base64;

Base64.encodeToString(byteArray, Base64.DEFAULT);

结果字符串:

2ValGk1i/WxTlMv4mtnWlqZGehor0lJ8/IzNpGSYOQmBAA==

javascript解码:

var decoded = atob(encodedString);
var bytes = [];

for (var i = 0; i < decoded.length; i++) {
    bytes.push(decoded.charCodeAt(i));
}

结果字节数组:

217,86,165,26,77,98,253,108,83,148,203,248,154,217,214,150,166,70,122,26,43,210,82,124,252,140,205,164,100,152,57,9,129,0

所有应为负数的数字都添加了256个。我该如何解决这个问题?

注意:解码它的android端会产生预期的结果。

1 个答案:

答案 0 :(得分:0)

我通过在循环内手动纠正它解决了这个问题:

for (var i = 0; i < decoded.length; i++) {
    var currentChar = decoded.charCodeAt(i);
    if (currentChar < 128)
        bytes.push(currentChar);
    else 
        bytes.push(currentChar - 256);
}

我仍在寻找实现这一目标的正确方法,如果有人知道请发帖。