Question

我正在努力将图片上传到服务器过去两天，因为有很多关于通过AFNetworking和NSURLSession上传图片的问题以及其他上传所有问题的方法我都没有问过＆＃ 39; t找到了一个单一的答案，解释了关于事情是如何运作的整个概念以及我在搜索youtube的内容中发生了什么，所有的东西都可以在Swift中找到并且完全不相信我的结果我发现这个答案是我看来很熟悉的东西

    //Init the NSURLSession with a configuration
NSURLSessionConfiguration *defaultConfigObject = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *defaultSession = [NSURLSession sessionWithConfiguration: defaultConfigObject delegate: nil delegateQueue: [NSOperationQueue mainQueue]];

//Create an URLRequest
NSURL *url = [NSURL URLWithString:@"yourURL"];
NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];

//Create POST Params and add it to HTTPBody
NSString *params = @"api_key=APIKEY&email=example@example.com&password=password";
[urlRequest setHTTPMethod:@"POST"];
[urlRequest setHTTPBody:[params dataUsingEncoding:NSUTF8StringEncoding]];

//Create task
NSURLSessionDataTask *dataTask = [defaultSession dataTaskWithRequest:urlRequest completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
    //Handle your response here
}];

[dataTask resume];

以及用户XJones关于此主题的最受欢迎的答案是： -

Here's code from my app to post an image to our web server:

// Dictionary that holds post parameters. You can set your post parameters that your server accepts or programmed to accept.
NSMutableDictionary* _params = [[NSMutableDictionary alloc] init];
[_params setObject:[NSString stringWithString:@"1.0"] forKey:[NSString stringWithString:@"ver"]];
[_params setObject:[NSString stringWithString:@"en"] forKey:[NSString stringWithString:@"lan"]];
[_params setObject:[NSString stringWithFormat:@"%d", userId] forKey:[NSString stringWithString:@"userId"]];
[_params setObject:[NSString stringWithFormat:@"%@",title] forKey:[NSString stringWithString:@"title"]];

// the boundary string : a random string, that will not repeat in post data, to separate post data fields.
NSString *BoundaryConstant = [NSString stringWithString:@"----------V2ymHFg03ehbqgZCaKO6jy"];

// string constant for the post parameter 'file'. My server uses this name: `file`. Your's may differ 
NSString* FileParamConstant = [NSString stringWithString:@"file"];

// the server url to which the image (or the media) is uploaded. Use your server url here
NSURL* requestURL = [NSURL URLWithString:@""]; 

// create request
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];                                    
[request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
[request setHTTPShouldHandleCookies:NO];
[request setTimeoutInterval:30];
[request setHTTPMethod:@"POST"];

// set Content-Type in HTTP header
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", BoundaryConstant];
[request setValue:contentType forHTTPHeaderField: @"Content-Type"];

// post body
NSMutableData *body = [NSMutableData data];

// add params (all params are strings)
for (NSString *param in _params) {
    [body appendData:[[NSString stringWithFormat:@"--%@\r\n", BoundaryConstant] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", param] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"%@\r\n", [_params objectForKey:param]] dataUsingEncoding:NSUTF8StringEncoding]];
}

// add image data
NSData *imageData = UIImageJPEGRepresentation(imageToPost, 1.0);
if (imageData) {
    [body appendData:[[NSString stringWithFormat:@"--%@\r\n", BoundaryConstant] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"image.jpg\"\r\n", FileParamConstant] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithString:@"Content-Type: image/jpeg\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:imageData];
    [body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
}

[body appendData:[[NSString stringWithFormat:@"--%@--\r\n", BoundaryConstant] dataUsingEncoding:NSUTF8StringEncoding]];

// setting the body of the post to the reqeust
[request setHTTPBody:body];

// set the content-length
NSString *postLength = [NSString stringWithFormat:@"%d", [body length]];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];

// set URL
[request setURL:requestURL];

但我的观点是我自己学习，如果没有解释就很难理解初学者，所以我所要求的只是一个解释，一个关于整个过程的细节解释，如果有人有在这个问题上花费的时间很难，因为不管你信不信，我发现这是迄今为止最困难的话题，因为主要的原因是没有关于整个过程的教程，如果有人现在可以迈出一步，并且对初学者也没有任何解释这个概念对明天学习的学生来说会更容易。因此，任何能够详细解释这一点以及上传过程如何运作以及参考的一些步骤的人都将不胜感激。

注意：考虑我有API和密钥＆＃34;图像＆＃34; 。

Answer 1

这里我们将看一下图片上传以及一些**参数，因为大部分时间我们都会上传图片以及一些参数，例如userId。

在深入讨论我们的主题之前，让我提供完成这些内容的代码source，我们将在下面看到的所有细节来自其他一些堆栈溢出线程，还有一些来自其他网站，我会提供所有链接供您参考。

-(void)callApiWithParameters:(NSDictionary *)inputParameter images:(NSArray *)image  imageParamters:(NSArray *)FileParamConstant{

//1
   NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];

   [request setHTTPShouldHandleCookies:NO];
   [request setTimeoutInterval:30];
   [request setHTTPMethod:@"POST"];

//2
   NSString *boundary = @"------CLABoundaryGOKUL";

//3
   NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
   [request setValue:contentType forHTTPHeaderField: @"Content-Type"];

//4
   NSMutableData *body = [NSMutableData data];

   for (NSString *key in inputParameter) {

   [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
   [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", key] dataUsingEncoding:NSUTF8StringEncoding]];
   [body appendData:[[NSString stringWithFormat:@"%@\r\n", [inputParameter objectForKey:key]] dataUsingEncoding:NSUTF8StringEncoding]];
  }

   for (int i = 0; i < image.count; i++) {

      NSData *imageDatasss = UIImagePNGRepresentation(image[i]);

      if (imageDatasss)
      {
          [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
          [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"image.jpg\"\r\n", FileParamConstant[i]] dataUsingEncoding:NSUTF8StringEncoding]];
          [body appendData:[@"Content-Type:image/jpeg\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
          [body appendData:imageDatasss];
          [body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
     }
  }

  [body appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

//5
  [request setHTTPBody:body];

//6
  [request setURL:[NSURL URLWithString:@"http://changeThisWithYourbaseURL?"]];//Eg:@"http://dev1.com/PTA_dev/webservice/webservice.php?"

//7
  [NSURLConnection sendAsynchronousRequest:request
                               queue:[NSOperationQueue mainQueue]
                   completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {

                       NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)response;

                       //8
                       if ([httpResponse statusCode] == 200) {
                           NSDictionary * APIResult =[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
                           NSLog(@"Response of %@: %@",[inputParameter valueForKey:@"service"],APIResult);

                       }else{
                           //9
                           NSLog(@"%@",error.localizedDescription);
                       }
                   }];


 }

注意：由于这是一个广泛的主题，我提供了详细信息的文档链接。

我们正在使用** NSMutableURLRequest **而不是** NSURLRequest **因为我们要向它添加一些数据。如果您需要对可变网址请求做一些深入的澄清，请通过此documentation。
- setHTTPShouldHandleCookies 在这里我们必须决定是否要使用cookies。要了解有关visit
- setTimeoutInterval 这有助于为url request设置时间限制。在给定时间后添加时间间隔（以秒为单位），请求将被终止。
- setHTTPMethod 有many种方法。但在很多情况下我们使用 GET 和 POST 方法.POST和GET之间的差异是here和here
Boundary有助于将参数彼此分开，以便服务器可以识别它们。边界可以是您希望随意编辑它的任何内容。
这里我们使用 multipart / form-data; boundary = 作为内容类型。要知道我们为什么要使用此内容类型，请查看this主题。

NSMutableData * body 我们会将所有参数和值附加到此数据中，然后将 setHTTPBody 附加到 UrlRequest 。

如果我们称之为'callApiWithParameters'方法

 - (IBAction)Done:(id)sender{
        NSDictionary * inputParameters = [NSDictionary dictionaryWithObjectsAndKeys:
                      @"1",@"user_id" ,
                      "XXX",@"name" ,
                      nil];
         NSArray * image = [NSArray arrayWithObjects:[UIImage imageNamed:@"Test"],[UIImage imageNamed:@"Test1"],nil];
         NSArray * imageParameters = [NSArray arrayWithObjects:@"img_one",@"img_two",nil];
         [self callApiWithParameters:inputParameters images:image imageParamters:imageParameters];
  }

然后数据（即正文）将如下所示

Content-Type=multipart/form-data; boundary=------CLABoundaryGOKUL

--------CLABoundaryGOKUL
Content-Disposition: form-data; name=user_id

1
--------CLABoundaryGOKUL
Content-Disposition: form-data; name=name

XXX
--------CLABoundaryGOKUL
Content-Disposition: form-data; name=img_one; filename=image.jpg

Content-Type:image/jpeg

//First image data appended here

--------CLABoundaryGOKUL
Content-Disposition: form-data; name=img_two; filename=image.jpg

Content-Type:image/jpeg

//Second image data appended here.

以上给出的数据将清楚地说明发生了什么，所有参数和密钥已附加在数据Here中，您可以找到有关发送multipart / form的更多详细信息。
1. 现在只需将上述数据添加到[request setHTTPBody:body];
2. setURL 会添加您应用的基本网址。
3. 现在我们需要做的就是建立与服务器的连接并发送请求。我们使用NSURLConnection发送请求。关于NSURLConnection的描述加载URL请求的数据并执行处理程序请求完成或失败时阻塞操作队列。
4. statusCode 有助于了解我们是否从服务器获得了成功的响应。如果 200 表示正常，则 500 表示内部服务器错误等。更多详细信息here。
5. 处理其他情况下的错误。

仅供参考我已经解释了我能做什么，请参考链接以便更好地理解。

修改

只需更改 imageParamater 数组中的名称，即可满足您的要求 img_one＆amp; img_two ，图片。

- (IBAction)Done:(id)sender{ //Change input parameters as per your requirement. NSDictionary * inputParameters = [NSDictionary dictionaryWithObjectsAndKeys: @"1",@"user_id" , "XXX",@"name" , nil]; NSArray * image = [NSArray arrayWithObjects:[UIImage imageNamed:@"Test"],nil]; //Change Test with your image name NSArray * imageParameters = [NSArray arrayWithObjects:@"image",nil];//Added image as a key. [self callApiWithParameters:inputParameters images:image imageParamters:imageParameters]; }

并使用您的示例基本网址更改第6点

// 6

[request setURL:[NSURL URLWithString:@"http://google.com/files/upload.php?"]];

Answer 2

我认为这对你有帮助......

- (void)sendImageToServer
{
    UIImage *yourImage= [UIImage imageNamed:@"image.png"];
    NSData *imageData = UIImagePNGRepresentation(yourImage);
    NSString *base64 = [imageData base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
    NSString *strImage = [NSString stringWithFormat:@"data:image/png;base64,%@",base64];

    NSMutableDictionary *dic = [[NSMutableDictionary alloc] initWithObjectsAndKeys:strImage,@"image", nil];
    NSError * err;
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dic options:0 error:&err];
    NSString *UserProfileInRequest = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
    NSData *data=[UserProfileInRequest dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
    NSString *len = [NSString stringWithFormat:@"%ld", (unsigned long)[data length]];

    // Init the URLRequest

    NSMutableURLRequest *req = [[NSMutableURLRequest alloc] init];
    [req setURL:[NSURL URLWithString:@"http://YOUR_URL"]];
    [req setHTTPMethod:@"POST"];
    [req setValue:len forHTTPHeaderField:@"Content-Type"];
    [req setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [req setValue:@"application/json" forHTTPHeaderField:@"Accept"];
    [req setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
    [req setHTTPBody:data];

    NSURLSession *session = [NSURLSession sharedSession];
    [[session dataTaskWithRequest:req completionHandler:^(NSData *dt, NSURLResponse *response, NSError *err){
        //Response Data
        NSMutableDictionary *dic = [NSJSONSerialization JSONObjectWithData:dt options:kNilOptions error:&err];
        NSLog(@"%@", [dic description]);

    }]resume];
}

Answer 3

使用AFNetworking为此任务提供非常简单可靠的解决方案。

将图像上传到服务器初学者的详细说明

3 个答案: