引用

import 'dart:convert';
解码(JSON String->Object)
// NOTE: Be sure to use double quotes ("),
// not single quotes ('), inside the JSON string.
// This string is JSON, not Dart.
var jsonString = '''
    {"score": 40},
    {"score": 80}
var scores = jsonDecode(jsonString);
assert(scores is List);
var firstScore = scores[0];
assert(firstScore is Map);
assert(firstScore['score'] == 40);
编码(Object->JSON String)
支持int, double, String, bool, null, List, Map (with string keys)
var scores = [
  {'score': 40},
  {'score': 80},
  {'score': 100, 'overtime': true, 'special_guest': null}
var jsonText = jsonEncode(scores);
assert(jsonText ==
    '[{"score":40},{"score":80},'
    '{"score":100,"overtime":true,'
    '"special_guest":null}]');
UTF-8
List<int> utf8Bytes = [
  0xc3, 0x8e, 0xc3, 0xb1, 0xc5, 0xa3, 0xc3, 0xa9,
  0x72, 0xc3, 0xb1, 0xc3, 0xa5, 0xc5, 0xa3, 0xc3,
  0xae, 0xc3, 0xb6, 0xc3, 0xb1, 0xc3, 0xa5, 0xc4,
  0xbc, 0xc3, 0xae, 0xc5, 0xbe, 0xc3, 0xa5, 0xc5,
  0xa3, 0xc3, 0xae, 0xe1, 0xbb, 0x9d, 0xc3, 0xb1
var funnyWord = utf8.decode(utf8Bytes);
assert(funnyWord == 'Îñţérñåţîöñåļîžåţîờñ');
解码stream
var lines = inputStream
    .transform(utf8.decoder)
    .transform(LineSplitter());
try {
  await for (var line in lines) {
    print('Got ${line.length} characters from stream');
  print('file is now closed');
} catch (e) {
  print(e);
List<int> encoded = utf8.encode('Îñţérñåţîöñåļîžåţîờñ');