Dart-编码和解码base64字符串

问题描述

如何原生转换 string -> base64 和 base64 -> string

How to native convert string -> base64 and base64 -> string

我只能找到以字节为单位的base64string

会这样:

String Base64String.encode();
String Base64String.decode();

还是从另一种语言移植更容易?

or ported from another language is easier?

推荐答案

您可以使用 BASE64编解码器(在Dart 2中重命名为 base64 )和(在Dart 2中重命名为 latin1 ).

You can use the BASE64 codec (renamed base64 in Dart 2) and the LATIN1 codec (renamed latin1 in Dart 2) from convert library.

var stringToEncode = 'Dart is awesome';

// encoding

var bytesInLatin1 = LATIN1.encode(stringToEncode);
// [68, 97, 114, 116, 32, 105, 115, 32, 97, 119, 101, 115, 111, 109, 101]

var base64encoded = BASE64.encode(bytesInLatin1);
// RGFydCBpcyBhd2Vzb21l

// decoding

var bytesInLatin1_decoded = BASE64.decode(base64encoded);
// [68, 97, 114, 116, 32, 105, 115, 32, 97, 119, 101, 115, 111, 109, 101]

var initialValue = LATIN1.decode(bytesInLatin1_decoded);
// Dart is awesome

如果您始终使用 LATIN1 来生成编码的String，则可以通过创建一个直接将字符串与编码的String相互转换的编解码器来避免两次convert调用.

If you always use LATIN1 to generate the encoded String you can avoid the 2 convert calls by creating a codec to directly convert a String to/from an encoded String.

var codec = LATIN1.fuse(BASE64);

print(codec.encode('Dart is awesome'));
// RGFydCBpcyBhd2Vzb21l

print(codec.decode('RGFydCBpcyBhd2Vzb21l'));
// Dart is awesome

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