/**
* 请求响应数据
*/
class MsgResponse {
int code; // 状态代码,0 表示没有错误
Object data; // 数据内容,一般为字符串
String errmsg; // 错误消息
MsgResponse([this.code = 0, this.data = null, this.errmsg = ""]);
}
static Map _makeHttpHeaders(
[String contentType,
String accept,
String token,
String XRequestWith,
String XMethodOverride]) {
Map headers = new Map<String, String>();
int i = 0;
if (!strIsEmpty(contentType)) {
i++;
headers["Content-Type"] = contentType;
}
if (!strIsEmpty(accept)) {
i++;
headers["Accept"] = accept;
}
if (!strIsEmpty(token)) {
i++;
headers["Authorization"] = "bearer " + token;
}
if (!strIsEmpty(XRequestWith)) {
i++;
headers["X-Requested-With"] = XRequestWith;
}
if (!strIsEmpty(XMethodOverride)) {
i++;
headers["X-HTTP-Method-Override"] = XMethodOverride;
}
if (i == 0) return null;
// print(headers.toString());
return headers;
}
/** HTTP POST 上传文件 */
static Future<MsgResponse> httpUploadFile(
final String url,
final File file, {
String accept = "*/*",
String token,
String field = "picture-upload",
String file_contentType, // 默认为null,自动获取
}) async {
try {
List<int> bytes = await file.readAsBytes();
return await httpUploadFileData(url, bytes,
accept: accept,
token: token,
field: field,
file_contentType: file_contentType,
filename: file.path);
} catch (e) {
return new MsgResponse(699, null, e.toString());
}
}
/** HTTP POST 上传文件 */
static Future<MsgResponse> httpUploadFileData(
final String url,
final List<int> filedata, {
String accept = "*/*",
String token,
String field = "picture-upload",
String file_contentType, // 默认为null,自动获取
String filename,
}) async {
try {
List<int> bytes = filedata;
var boundary = _boundaryString();
String contentType = 'multipart/form-data; boundary=$boundary';
Map headers =
_makeHttpHeaders(contentType, accept, token); //, "XMLHttpRequest");
// 构造文件字段数据
String data =
'--$boundary\r\nContent-Disposition: form-data; name="$field"; ' +
'filename="${getFileFullName(filename)}"\r\nContent-Type: ' +
'${(file_contentType == null) ? getMediaType(getFileExt(filename).toLowerCase()): file_contentType}\r\n\r\n';
var controller = new StreamController<List<int>>(sync: true);
controller.add(data.codeUnits);
controller.add(bytes);
controller.add("\r\n--$boundary--\r\n".codeUnits);
controller.close();
bytes = await new Http.ByteStream(controller.stream).toBytes();
//print("bytes: \r\n" + UTF8.decode(bytes, allowMalformed: true));
Http.Response response =
await Http.post(url, headers: headers, body: bytes);
if (response.statusCode == 200) {
return new MsgResponse(0, response.body);
} else
return new MsgResponse(response.statusCode, response.body);
} catch (e) {
return new MsgResponse(699, null, e.toString());
}
}
/** 生成随机字符串 */
static String randomStr(
[int len = 8, List<int> chars = _BOUNDARY_CHARACTERS]) {
var list = new List<int>.generate(
len, (index) => chars[_random.nextInt(chars.length)],
growable: false);
return new String.fromCharCodes(list);
}
static const List<int> _BOUNDARY_CHARACTERS = const <int>[
0x30,
0x31,
0x32,
0x33,
0x34,
0x35,
0x36,
0x37,
0x38,
0x39,
0x61,
0x62,
0x63,
0x64,
0x65,
0x66,
0x67,
0x68,
0x69,
0x6A,
0x6B,
0x6C,
0x6D,
0x6E,
0x6F,
0x70,
0x71,
0x72,
0x73,
0x74,
0x75,
0x76,
0x77,
0x78,
0x79,
0x7A,
0x41,
0x42,
0x43,
0x44,
0x45,
0x46,
0x47,
0x48,
0x49,
0x4A,
0x4B,
0x4C,
0x4D,
0x4E,
0x4F,
0x50,
0x51,
0x52,
0x53,
0x54,
0x55,
0x56,
0x57,
0x58,
0x59,
0x5A
];
static const int _BOUNDARY_LENGTH = 48;
static final Random _random = new Random();
static String _boundaryString() {
var prefix = "---DartFormBoundary";
var list = new List<int>.generate(
_BOUNDARY_LENGTH - prefix.length,
(index) =>
_BOUNDARY_CHARACTERS[_random.nextInt(_BOUNDARY_CHARACTERS.length)],
growable: false);
return "$prefix${new String.fromCharCodes(list)}";
}
static MediaType getMediaType(final String fileExt) {
switch (fileExt) {
case ".jpg":
case ".jpeg":
case ".jpe":
return new MediaType("image", "jpeg");
case ".png":
return new MediaType("image", "png");
case ".bmp":
return new MediaType("image", "bmp");
case ".gif":
return new MediaType("image", "gif");
case ".json":
return new MediaType("application", "json");
case ".svg":
case ".svgz":
return new MediaType("image", "svg+xml");
case ".mp3":
return new MediaType("audio", "mpeg");
case ".mp4":
return new MediaType("video", "mp4");
case ".htm":
case ".html":
return new MediaType("text", "html");
case ".css":
return new MediaType("text", "css");
case ".csv":
return new MediaType("text", "csv");
case ".txt":
case ".text":
case ".conf":
case ".def":
case ".log":
case ".in":
return new MediaType("text", "plain");
}
return null;
}