AFNetworking 2.0 使用总结

iOS应用开发，存在网络请求是在所难免的，而AFNetworking是一个很不错的选择。以下是本人对AFNetworking请求的一些总结，但愿能帮到大家！

1.JSON Post请求

NSString *strName = @"user1";
NSString *strPsw = @"pwd1";
 
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.requestSerializer = [AFJSONRequestSerializer serializer];
NSDictionary *parameters = [NSDictionary dictionaryWithObjectsAndKeys:strName, @"user", strPsw, @"password", nil];
NSString *strURL = [GT123_ServerHost stringByAppendingString:GT123_LogonServlet];
[manager POST:strURL parameters:parameters
      success:^(AFHTTPRequestOperation *operation, id responseObject)
 {
     if (responseObject != nil)
     {
         NSDictionary *dicRes = responseObject;
         NSString *strState = [dicRes objectForKey:@"state"];
         if (strState && [strState isEqualToString:@"success"])
         {
             NSString *strSession = [dicRes objectForKey:@"session"];
              
             NSLog(@"%@", strSession);
         } else {
         }
     } else {
     }
 } failure:^(AFHTTPRequestOperation *operation, NSError *error)
 {
 }];

上段代码是用户登录请求，用到了AFHTTPRequestOperationManager的POST请求。请求参数放到NSDictionary里（NSMutableDictionary也可），strURL是请求服务地址，success和failure后面写请求回调内容。返回内容responseObject其实是一个NSDictionary对象，解析比较容易。

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2.JSON Get请求

long long lTimestamp = [[NSDate date] timeIntervalSince1970] * 1000;
 
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
NSString *strURL = [NSString stringWithFormat:@"%@%@?max=20&et=%lld",GT123_ServerHost,GT123_GetNewsListBeforeServlet, lTimestamp];
[manager GET:strURL parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
    if (responseObject != nil)
    {
        NSDictionary *dicRes = responseObject;
        NSString *strState = [dicRes objectForKey:@"state"];
        if (strState && [strState isEqualToString:@"success"])
        {
            NSArray *lNews = [dicRes objectForKey:@"post_list"];
            if (lNews && lNews.count > 0)
            {
                NSLog(@"news count - %lu", (unsigned long)lNews.count);
            }
        } else {
        }
    } else
    {
    }
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
}];

上段代码是获取新闻列表的具体实现，用到了AFHTTPRequestOperationManager的GET请求。所以请求参数放到strURL里。请求返回内容responseObject也是一个NSDictionary对象。

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3.图片上传

- (void)uploadImg:(UIImage *)img withName:(NSString *)imgName {
     
    NSData *imageData = UIImageJPEGRepresentation(img, 1.0);
     
    NSMutableDictionary *parameters = [[NSMutableDictionary alloc] init];
    [parameters setObject:imgName forKey:@"name"];
    [parameters setObject:@"jpg" forKey:@"type"];
     
    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    manager.requestSerializer = [AFJSONRequestSerializer serializer];
    NSString *strURL = [GT123_ServerHost stringByAppendingString:GT123_UploadPostPictureServlet];
    [manager POST:strURL parameters:parameters constructingBodyWithBlock:^(id<AFMultipartFormData> formData)
     {
         if (imageData)
         {
             [formData appendPartWithFileData:imageData name:imgName fileName:imgName mimeType:@"image/jpeg"];
         }
     } success:^(AFHTTPRequestOperation *operation, id responseObject) {
          
         if (responseObject)
         {
             NSDictionary *dicRes = responseObject;
             NSString *strState = [dicRes objectForKey:@"state"];
             if (strState && [strState isEqualToString:@"success"])
             {
                 NSLog(@"upload success!");
             } else {
             }
         } else {
         }
          
     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
     }];
}

以上代码通过post方法将图片上传到服务器。与上述所讲json post请求不同，这里需要填充constructingBodyWithBlock内容，也就是图片数据和参数。图片数据是NSData类型，需要将UIImage转成NSData。如果需要传其他参数的话，放到parameters里，同图片数据一起上传服务器。

1	`[formData appendPartWithFileData:imageData name:imgName fileName:imgName mimeType:@"image/jpeg"];`

上一行代码里name和fileName参数可以随意给个值，不要太纠结。

返回内容还是一个NSDictionary对象。

AFNetworking请求方面，本人的总结暂时有这些，后续再补上...