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");

    }

}