引用
import 'dart:convert';
JSON
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
解码
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);
}
编码
List<int> encoded = utf8.encode('Îñţérñåţîöñåļîžåţîờñ');
assert(encoded.length == utf8Bytes.length);
for (int i = 0; i < encoded.length; i++) {
assert(encoded[i] == utf8Bytes[i]);
}
