iOS通过Http 上传图片详解手机开发

- (NSMutableURLRequest *)PostImageRequest:(NSString *)URLString 
                                  UIImage:(UIImage*)image 
                               parameters:(NSDictionary *)parameters 
                                  success:(void (^)(id))success 
                                  failure:(void (^)(NSError *))failure 
{ 
    _success = [success copy]; 
    _failure = [failure copy]; 
    //分界线的标识符 
    NSString *TWITTERFON_FORM_BOUNDARY = @"AaB03x"; 
    //根据url初始化request 
    _request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:URLString] 
                                                           cachePolicy:NSURLRequestReloadIgnoringLocalCacheData 
                                                       timeoutInterval:10]; 
    //分界线 --AaB03x 
    NSString *MPboundary=[[NSString alloc]initWithFormat:@"--%@",TWITTERFON_FORM_BOUNDARY]; 
    //结束符 AaB03x-- 
    NSString *endMPboundary=[[NSString alloc]initWithFormat:@"%@--",MPboundary]; 
    //得到图片的data 
    NSData* data = UIImageJPEGRepresentation(image, 1); 
    //http body的字符串 
    NSMutableString *body=[[NSMutableString alloc]init]; 
    //参数的集合的所有key的集合 
    NSArray *keys= [parameters allKeys]; 
  
    //遍历keys 
    for(int i=0;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",[parameters 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=/"ImageField/"; filename=/"x1234.png/"/r/n"]; 
    //声明上传文件的格式 
    [body appendFormat:@"Content-Type: image/jpeg/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"]; 
      
    return _request; 
}