NSOutputStream\NSInputStream

NSOutputStream-保存网络资源到本地

_filePath = [[NetworkManager sharedInstance] pathForTemporaryFileWithPrefix:@"Get"];

_fileStream = [NSOutputStream outputStreamToFileAtPath:self.filePath append:NO];

[_fileStream open];

2.进行网络请求，并返回网络的数据。

通过输出流对象，将数据写入到指定的文件中。

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{

NSInteger       dataLength;

const uint8_t * dataBytes;

NSInteger       bytesWritten;

NSInteger       bytesWrittenSoFar;

// 接收到的数据长度

dataLength = [data length];

dataBytes  = [data bytes];

bytesWrittenSoFar = 0;

do {

bytesWritten = [self.fileStream write:&dataBytes[bytesWrittenSoFar]maxLength:dataLength - bytesWrittenSoFar];

assert(bytesWritten != 0);

if (bytesWritten == -1) {

break;

} else {

bytesWrittenSoFar += bytesWritten;

}

} while (bytesWrittenSoFar != dataLength);

}

NSInputStream和NSMutableURLRequest-实现保存文件到服务器

1.准备工作，将需要的类进行声明定义。

*.h 文件

NSURLConnection* _aSynConnection;

NSInputStream *_inputStreamForFile;

NSString *_localFilePath;

@property (nonatomic,retain) NSURLConnection* aSynConnection;

@property (nonatomic,retain) NSInputStream *inputStreamForFile;

@property (nonatomic,retain) NSString *localFilePath;

*.m 文件

@synthesize inputStreamForFile=_inputStreamForFile;

@synthesize localFilePath=_localFilePath;

@synthesize aSynConnection=_aSynConnection;

2.进行请求

- (void)btnClickAction:(id)sender{

// 初始化目标地址的URL（发送到哪里）

NSURL *serverURL;

NSString *strURL=@"http://www.xxx.com/fileName.png";// 这里用图片为例

strURL = [strURL stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];

serverURL=[NSURL URLWithString:strURL];

// 初始化本地文件路径,并与NSInputStream链接

self.localFilePath=@"本地的图片路径";

self.inputStreamForFile = [NSInputStream inputStreamWithFileAtPath:self.localFilePath];

// 上传大小

NSNumber *contentLength;

contentLength = (NSNumber *) [[[NSFileManager defaultManager]attributesOfItemAtPath:self.localFilePath error:NULL] objectForKey:NSFileSize];

NSMutableURLRequest *request;

request = [NSMutableURLRequest requestWithURL:serverURL];

[request setHTTPMethod:@"PUT"];

[request setHTTPBodyStream:self.inputStreamForFile];

[request setValue:@"image/png" forHTTPHeaderField:@"Content-Type"];

[request setValue:[contentLength description] forHTTPHeaderField:@"Content-Length"];

// 请求

self.aSynConnection = [NSURLConnection connectionWithRequest:requestdelegate:self];

}

3.接受回调函数的状态，判断是否上传成功。

// 收到响应时，会触发

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse*)aResponse{

NSLog(@"请求成功！");

returnInfoData=[[NSMutableData alloc]init];

totalSize= [aResponse expectedContentLength];

NSHTTPURLResponse * httpResponse;

httpResponse = (NSHTTPURLResponse *)aResponse;

if ((httpResponse.statusCode / 100) != 2) {

NSLog(@"保存失败");

} else {

NSLog(@"保存成功");

}

}