上传多张图片到服务器IOS答案

【问题标题】：Upload Multiple Images to Server IOS上传多张图片到服务器IOS
【发布时间】：2015-09-19 15:38:56
【问题描述】：

我想知道如何使用 Objective C 将多个图像上传到服务器。这是我正在尝试使用的代码 sn-p。

-(void)uploadImage:(NSMutableArray *)image andMessageBO:(MessageBO *)message
{
    NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"%@PostImageServlet?",kPostImageUploadWebServiceURL]];
    NSMutableURLRequest *postRequest = [NSMutableURLRequest requestWithURL:url];

    [postRequest setHTTPMethod:@"POST"];
    [postRequest setTimeoutInterval:60.0];
    NSString *stringBoundary = @"0xKhTmLbOuNdArY";
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",stringBoundary];
    [postRequest addValue:contentType forHTTPHeaderField: @"Content-Type"];

    NSData *imageData =UIImagePNGRepresentation(image);


    NSMutableData *postBody = [[NSMutableData alloc] init];
    [postBody appendData:[[NSString stringWithFormat:@"isFormField=true"]dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[[NSString stringWithFormat:@"--%@\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[[NSString stringWithFormat:@"%@",@"Content-Disposition: form-data; name=\"userid\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[[NSString stringWithFormat:@"%d",messageBO.messageId] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"profilepic\"; filename=\"%d_postImage.png\"\r\n",messageBO.messageId] dataUsingEncoding:NSUTF8StringEncoding]];
       for (int i = 0; i < [image count]; i++)
    {
        [postBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"profilepic\"; filename=\"%d_postImage%d.png\"\r\n",messageBO.messageId,i] dataUsingEncoding:NSUTF8StringEncoding]];
        [postBody appendData:[image objectAtIndex:i]];
    }
    [postBody appendData:[[NSString stringWithFormat:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];

    [postBody appendData:[NSData dataWithData:imageData]];
    [postBody appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [postRequest setHTTPBody:postBody];

    NSData *returnData = [NSURLConnection sendSynchronousRequest:postRequest returningResponse:nil error:nil];
    NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
    DebugLog(@"IMge:%@",returnString);

    //  [self removeOfflineImage:expenseBO];

}

谢谢

【问题讨论】：

标签： ios objective-c

【解决方案1】：

我个人使用这种方法来沟通和上传人员到服务器这是一种 json 类型的方法：

- (NSURLRequest *)convertToRequest:(NSString *)stringURL withDictionary:(NSDictionary *)dictionary
{

    NSError *error = nil;

    NSData *JSONData = [NSJSONSerialization dataWithJSONObject:dictionary options:0 error:&error];

    NSURL *url = [NSURL URLWithString:stringURL];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

    [request setHTTPMethod:@"POST"];
    [request setHTTPBody: JSONData];
    [request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Accept-Encoding"];

    [request setValue:[NSString stringWithFormat:@"%lu", (unsigned long)[JSONData length]] forHTTPHeaderField:@"Content-Length"];


    return request;
}

字典参数填充了类似的内容：

首先将数据转换为 base64String 之类的：

NSData *data = UIImageJPEGRepresentation(self.userImageView.image, 1.0);

NSData *imageBase64Data = [data base64EncodedDataWithOptions:0];

NSString *imageBase64String = [[NSString alloc] initWithData:imageBase64Data encoding: NSUTF8StringEncoding];

将此添加到字典中...

NSDictionary *jsonDictionary = @{
                                   @0 : @{
                                     "name": "file1",
                                     "image" : imageBase64String1
                                   },
                                   @1 : @{
                                     "name": "file2",
                                     "image" : imageBase64String2
                                   } //and so on.. 
                                }; 
//you may want to put that in a loop

[ImplementationClass convertToRequest:YourServerURL withDictionary: jsonDictionary];

在服务器端类似：

解码发送到服务器的数据（PHP）：

// Retrieves data

$handle = fopen('php://input','r');
$jsonInput = fgets($handle);
$json_decoded = json_decode($jsonInput,true);

/* 
* I commented this because i'm not sure if this suits my `NSDictionary` above
* but you can always check by logging `$json_decoded` or probably `var_dump()` function of php
*
* $json_decoded[0]['name'];
* $json_decoded[0]['image'];
* $json_decoded[1]['name'];
* $json_decoded[1]['image'];
*/

function upload_image($filename, $uploadedfile) {

    $save_file_path = getcwd()."/uploads/";

    $save_file_path     .= $filename;

    $image_file         = base64_decode($uploadedfile);

    //DELETES EXISTING
    if (file_exists($save_file_path)) {  unlink($save_file_path);  } 

    //CREATE NEW FILE
    file_put_contents($save_file_path, $image_file); 

    //CHECK FILE IF EXIST 
    return ((file_exists($save_file_path)) ? true : false );

}

希望这对你有帮助..干杯..

【讨论】：