82 lines
2.3 KiB
Dart
82 lines
2.3 KiB
Dart
//下载文件
|
|
import 'dart:io';
|
|
|
|
import 'package:path_provider/path_provider.dart';
|
|
|
|
class LocalDownload {
|
|
static Future<String> getLocalFilePath(String url, String path) async {
|
|
Uri uri = Uri.parse(url);
|
|
String fileName = uri.pathSegments.last;
|
|
//获取下载目录
|
|
Directory dir = await getApplicationCacheDirectory();
|
|
Directory uploadPath = Directory("${dir.path}$path/");
|
|
return uploadPath.path + fileName;
|
|
}
|
|
|
|
/// 公用下载方法
|
|
/// url 下载网络地址
|
|
/// path 存储地址，如/test
|
|
/// onProgress 下载回调函数
|
|
/// onDone 下载完毕回调
|
|
static downLoadFile({
|
|
required url,
|
|
required path,
|
|
required Function(double) onProgress,
|
|
required Function(String) onDone,
|
|
}) async {
|
|
HttpClient client = HttpClient();
|
|
Uri uri = Uri.parse(url);
|
|
//获取本地文件路径
|
|
String filePath = await getLocalFilePath(url, path);
|
|
// 发起 get 请求
|
|
HttpClientRequest request = await client.getUrl(uri);
|
|
// 响应
|
|
HttpClientResponse response = await request.close();
|
|
int contentLength = response.contentLength; // 获取文件总大小
|
|
int bytesReceived = 0; // 已接收的字节数
|
|
List<int> chunkList = [];
|
|
if (response.statusCode == 200) {
|
|
response.listen(
|
|
(List<int> chunk) {
|
|
chunkList.addAll(chunk);
|
|
bytesReceived += chunk.length; //更新已接受的字节数
|
|
//进度
|
|
double progress = bytesReceived * 100 / contentLength * 100;
|
|
progress = (progress / 100).truncateToDouble();
|
|
onProgress(progress);
|
|
},
|
|
onDone: () async {
|
|
//下载完毕
|
|
client.close();
|
|
File file = File(filePath);
|
|
if (!file.existsSync()) {
|
|
file.createSync(recursive: true);
|
|
await file.writeAsBytes(chunkList);
|
|
}
|
|
onDone(file.path);
|
|
},
|
|
onError: () {
|
|
client.close();
|
|
},
|
|
cancelOnError: true,
|
|
);
|
|
}
|
|
}
|
|
|
|
///获取本地地址
|
|
///
|
|
static Future<String> getFilePath({
|
|
required url,
|
|
required path,
|
|
}) async {
|
|
//获取本地文件路径
|
|
String filePath = await getLocalFilePath(url, path);
|
|
File file = File(filePath);
|
|
if (file.existsSync()) {
|
|
return file.path;
|
|
} else {
|
|
return '';
|
|
}
|
|
}
|
|
}
|