图片上传

项目中用到图片上传, 本来准备使用AFN 的 但是发现用AFN 后台接收不到图片流.
就自己用系统自带的网络库写了个上传图片的请求

// 1.创建Session
    NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:actoion delegateQueue:[NSOperationQueue mainQueue]];
    
    NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://172.16.151.152:8080/picServer/pic/upload"]];
    [request addValue:@"image/jpeg" forHTTPHeaderField:@"Content-Type"];
    [request addValue:@"text/html" forHTTPHeaderField:@"Accept"];
    [request addValue:@"Application/Json" forHTTPHeaderField:@"Accept"];
    [request setHTTPMethod:@"POST"];
    [request setCachePolicy:NSURLRequestReloadIgnoringCacheData];
    [request setTimeoutInterval:20];
    NSData * imageData = UIImageJPEGRepresentation(img,0.8);
    NSString *picStr = [NSString stringWithFormat:@"%@%@|",LYUserDefaultForKey(userAccountKey),name];
    
    NSData *picName = [picStr dataUsingEncoding:NSUTF8StringEncoding];
    
    NSMutableData *mData = [NSMutableData dataWithData:picName];
    [mData appendData:imageData];
    
    
    NSURLSessionUploadTask * uploadTask = [session uploadTaskWithRequest:request fromData:mData completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        
        NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];

        loadResult(dict);

    }];
    
//    uploadTask.
    [uploadTask resume];

如果需要监控上传的进度那就需要设置代理对象, 遵守NSURLSessionTaskDelegate协议

- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didSendBodyData:(int64_t)bytesSent totalBytesSent:(int64_t)totalBytesSent totalBytesExpectedToSend:(int64_t)totalBytesExpectedToSend
{
    //    NSLog(@"didSendBodyData");
    NSLog(@"+++++%f", 1.0 * totalBytesSent / totalBytesExpectedToSend);

}

注: 如果上传有问题, 那么可能请求头设置有问题, 那么就可以用青花瓷, 抓上送报文, 就可以看到, 那个请求头设置错误就会有提示.