iOS通過Http 上傳圖片

- (NSMutableURLRequest )PostImageRequest:(NSString )URLString
                                  UIImage:(UIImage)image
                               parameters:(NSDictionary )parameters
                                  success:(void (^)(id))success
                                  failure:(void (^)(NSError ))failure
{
    _success = [success copy];
    _failure = [failure copy];
    //分界線的標識符
    NSString TWITTERFON_FORM_BOUNDARY = @"AaB03x";
    //根據url初始化request
    _request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:URLString]
                                                           cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                                                       timeoutInterval:10];
    //分界線 --AaB03x
    NSString MPboundary=[[NSString alloc]initWithFormat:@"--%@",TWITTERFON_FORM_BOUNDARY];
    //結束符 AaB03x--
    NSString endMPboundary=[[NSString alloc]initWithFormat:@"%@--",MPboundary];
    //得到圖片的data
    NSData data = UIImageJPEGRepresentation(image, 1);
    //http body的字符串
    NSMutableString body=[[NSMutableString alloc]init];
    //參數的集合的所有key的集合
    NSArray *keys= [parameters allKeys];


//遍歷keys
for(int i=0;i<[keys count];i++)
{
    //得到當前key
    NSString *key=[keys objectAtIndex:i];
    //如果key不是pic，說明value是字符類型，比如name：Boris
    if(![key isEqualToString:@"pic"])
    {
        //添加分界線，換行
        [body appendFormat:@"%@\r\n",MPboundary];
        //添加字段名稱，換2行
        [body appendFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n",key];
        //添加字段的值
        [body appendFormat:@"%@\r\n",[parameters objectForKey:key]];
    }
}

////添加分界線，換行
[body appendFormat:@"%@\r\n",MPboundary];
//聲明pic字段，文件名為boris.png
[body appendFormat:@"Content-Disposition: form-data; name=\"ImageField\"; filename=\"x1234.png\"\r\n"];
//聲明上傳文件的格式
[body appendFormat:@"Content-Type: image/jpeg\r\n\r\n"];

//聲明結束符：--AaB03x--
NSString *end=[[NSString alloc]initWithFormat:@"\r\n%@",endMPboundary];
//聲明myRequestData，用來放入http body
NSMutableData *myRequestData=[NSMutableData data];
//將body字符串轉化為UTF8格式的二進制
[myRequestData appendData:[body dataUsingEncoding:NSUTF8StringEncoding]];
//將image的data加入
[myRequestData appendData:data];
//加入結束符--AaB03x--
[myRequestData appendData:[end dataUsingEncoding:NSUTF8StringEncoding]];

//設置HTTPHeader中Content-Type的值
NSString *content=[[NSString alloc] initWithFormat:@"multipart/form-data; boundary=%@",TWITTERFON_FORM_BOUNDARY];
//設置HTTPHeader
[_request setValue:content forHTTPHeaderField:@"Content-Type"];
//設置Content-Length
[_request setValue:[NSString stringWithFormat:@"%d", [myRequestData length]] forHTTPHeaderField:@"Content-Length"];
//設置http body
[_request setHTTPBody:myRequestData];
//http method
[_request setHTTPMethod:@"POST"];

return _request;

}</pre>