- (void)postImage:(UIImage *)_image

{

    //分界线的标识符

    NSString *TWITTERFON_FORM_BOUNDARY = @"AaB03x";

    //根据url初始化request

    NSInteger schoolID = [[BaseUser shareInstance].userIdentity.school_id integerValue];

    NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"url"]

                                                           cachePolicy:NSURLRequestReloadIgnoringLocalCacheData

                                                       timeoutInterval:];

    //分界线 --AaB03x

    NSString *MPboundary=[[NSString alloc]initWithFormat:@"--%@",TWITTERFON_FORM_BOUNDARY];

    //结束符 AaB03x--

    NSString *endMPboundary=[[NSString alloc]initWithFormat:@"%@--",MPboundary];

    //要上传的图片

    UIImage *image= _image;

    //得到图片的data

    NSData* data = UIImagePNGRepresentation(image);

    //http body的字符串

    NSMutableString *body=[[NSMutableString alloc]init];

    //参数的集合的所有key的集合

    NSDictionary *param = @{};

    NSArray *keys = [[param keyValues] allKeys];

    //遍历keys

    for(int i=;i<[keys count];i++)

    {

        //得到当前key

        NSString *key=[keys objectAtIndex:i];

        //如果key不是pic，说明value是字符类型，比如name：Boris

        if(![key isEqualToString:@"pic"])

        {

            //添加分界线，换行

            [body appendFormat:@"%@\r\n",MPboundary];

            //添加字段名称，换2行

            [body appendFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n",key];

            //添加字段的值

            [body appendFormat:@"%@\r\n",[[param keyValues] objectForKey:key]];

        }

    }

    ////添加分界线，换行

    [body appendFormat:@"%@\r\n",MPboundary];

    //声明pic字段，文件名为boris.png

    [body appendFormat:@"Content-Disposition: form-data; name=\"pic\"; filename=\"boris.png\"\r\n"];

    //声明上传文件的格式

    [body appendFormat:@"Content-Type: image/png\r\n\r\n"];

    //声明结束符：--AaB03x--

    NSString *end=[[NSString alloc]initWithFormat:@"\r\n%@",endMPboundary];

    //声明myRequestData，用来放入http body

    NSMutableData *myRequestData=[NSMutableData data];

    //将body字符串转化为UTF8格式的二进制

    [myRequestData appendData:[body dataUsingEncoding:NSUTF8StringEncoding]];

    //将image的data加入

    [myRequestData appendData:data];

    //加入结束符--AaB03x--

    [myRequestData appendData:[end dataUsingEncoding:NSUTF8StringEncoding]];

    //设置HTTPHeader中Content-Type的值

    NSString *content=[[NSString alloc]initWithFormat:@"multipart/form-data; boundary=%@",TWITTERFON_FORM_BOUNDARY];

    //设置HTTPHeader

    [request setValue:content forHTTPHeaderField:@"Content-Type"];

    //设置Content-Length

    [request setValue:[NSString stringWithFormat:@"%d", [myRequestData length]] forHTTPHeaderField:@"Content-Length"];

    //设置http body

    [request setHTTPBody:myRequestData];

    //http method

    [request setHTTPMethod:@"POST"];

    //建立连接，设置代理

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

        if (connectionError) {

        }else{

             NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];

            NSLog(@"上传成功");

        }

    }];

}