iOS 分段上传的方法

#define XMGBoundary @"GetHTML"

#define XMGEncode(string) [string dataUsingEncoding:NSUTF8StringEncoding]

#define XMGNewLine [@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]

#pragma mark - 断点续传（服务器要做设置）

- (void)update:(NSDictionary*)dict {

NSDictionary *attriDict = [[NSFileManager defaultManager] attributesOfItemAtPath:[self.filePathURL path] error:nil];

//循环次数

NSString * fileSize = attriDict[NSFileSize];

NSInteger times = fileSize.longLongValue/1000000;

//开始循环读取

for (NSInteger index = 0; index < times ; index ++) {

//创建句柄

NSFileHandle *fileHandle = [NSFileHandle fileHandleForReadingAtPath:[self.filePathURL path]];

//设置每次句柄偏移量

[fileHandle seekToFileOffset:1000000 *(index + 1)];

//获取每次读入data

NSData *data = [fileHandle readDataOfLength:1000000];

[self updateVideo:dict Data:data];

NSLog(@"-----%lu",(unsigned long)data.length);

if (index == times - 1) {

//关闭句柄

[fileHandle closeFile];

}

}

}

- (void)updateVideo:(NSDictionary*)dict Data:(NSData *)data {

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://********"]];

request.HTTPMethod = @"POST";

request.timeoutInterval = 1000;

// 设置请求头(告诉服务器,这是一个文件上传的请求)

[request setValue:[NSString stringWithFormat:@"multipart/form-data; boundary=%@", XMGBoundary] forHTTPHeaderField:@"Content-Type"];

NSLog(@"%@",request);

// 设置请求体

NSMutableData *body = [NSMutableData data];

// 文件参数

// 分割线

[body appendData:XMGEncode(@"--")];

[body appendData:XMGEncode(XMGBoundary)];

[body appendData:XMGNewLine];

// 文件参数名

NSString *fileStr = [NSString stringWithFormat:@"Content-Disposition: form-data; name=\"file\"; filename=\"%@\"",self.videoName];

[body appendData:XMGEncode(fileStr)];

[body appendData:XMGNewLine];

// 文件的类型

NSString *typeStr = [NSString stringWithFormat:@"Content-Type: %@",dict[@"contenttype"]];

[body appendData:XMGEncode(typeStr)];

[body appendData:XMGNewLine];

// 文件数据

[body appendData:XMGNewLine];

if (data) {

[body appendData:data];

} else {

[body appendData:[NSData dataWithContentsOfFile:[_filePathURL path]]];

}

[body appendData:XMGNewLine];

// 结束标记

/*

--分割线--\r\n

*/

[body appendData:XMGEncode(@"--")];

[body appendData:XMGEncode(XMGBoundary)];

[body appendData:XMGEncode(@"--")];

[body appendData:XMGNewLine];

NSLog(@"%@",body);

[[self.session uploadTaskWithRequest:request fromData:body completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {

NSLog(@"%@",[[ NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);

NSDictionary *dataDic = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];

}] resume];

}