- (void)postImage:(UIImage *)_image
{//分界线的标识符NSString *TWITTERFON_FORM_BOUNDARY = @"AaB03x";//根据url初始化requestNSInteger schoolID = [[BaseUser shareInstance].userIdentity.school_id integerValue];NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"url"]cachePolicy:NSURLRequestReloadIgnoringLocalCacheDatatimeoutInterval:10];//分界线 --AaB03xNSString *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dataNSData* 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keysfor(int i=0;i<[keys count];i++){//得到当前keyNSString *key=[keys objectAtIndex:i];//如果key不是pic，说明value是字符类型，比如name：Borisif(![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 bodyNSMutableData *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");}}];}