最近浏览发现现在有时会使用form-data格式提交数据，其实和提交 json差不多，但还是有点不同。今天试了一把，这种提交方法现在不常见了，大多使用json的比较多，至此，记录下。

1、先来演示提交图片+键值对

当然了，我是使用AFNetWorking框架

//需要提交的数据
    NSData  *data_f = UIImageJPEGRepresentation(zImage, 0.8);
    NSData  *data_s = UIImageJPEGRepresentation(fImage, 0.8);
    NSDictionary  * dic = [NSMutableDictionary new];
    [dic setValue:@"value1" forKey:@"key1"];
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:nil];

    //配置AF
    AFHTTPSessionManager *manage = [AFHTTPSessionManager manager];
    [manage.requestSerializer setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
    manage.requestSerializer = [AFHTTPRequestSerializer serializer];
    manage.responseSerializer = [AFHTTPResponseSerializer serializer];
    manage.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/html", @"text/json", @"text/javascript",@"text/plain", nil];

    [manage POST:@"提交的URL" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
        //当提交一张图片或一个文件的时候 name 可以随便设置，服务端直接能拿到，如果服务端需要根据name去取不同文件的时候，则appendPartWithFileData 方法中的 name 需要根据form的中的name一一对应  
        [formData appendPartWithFormData:jsonData name:@"UploadData"];
        [formData appendPartWithFileData: data_f name:@"photoF" fileName:@"a.jpg" mimeType:@"image/jpeg"];
        [formData appendPartWithFileData: data_s name:@"photoS" fileName:@"b.jpg" mimeType:@"image/jpeg"];
    } progress:^(NSProgress * _Nonnull uploadProgress) {
        
    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        NSDictionary *responseDic = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingAllowFragments error:nil];
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
    }];

2、下面来看一种只上传键值对

/**
 form-data请求接口

 @param url 请求地址
 @param parameters 请求参数   传字典就行，所有的键值对都传进来
 @param success 成功
 @param failure 失败
 */
   + (void)p_postRequestUrl:(NSString *)url
              parameters:(NSDictionary *)parameters
                 success:(void (^)(id responseObject))success
                 failure:(void (^)(id errorLog))failure {
    //配置AF
    AFHTTPSessionManager *manage = [AFHTTPSessionManager manager];
    [manage.requestSerializer setValue:@"application/form-data" forHTTPHeaderField:@"Content-Type"];
    manage.requestSerializer = [AFHTTPRequestSerializer serializer];
    manage.responseSerializer = [AFHTTPResponseSerializer serializer];
    manage.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/html", @"text/json", @"text/javascript",@"text/plain", nil];
    
    [manage POST:url parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
        
        for (NSString *key in [parameters allKeys]) {
            
            [formData appendPartWithFormData:[[parameters objectForKey:key] dataUsingEncoding:NSUTF8StringEncoding] name:key];
        }
        
    } progress:^(NSProgress * _Nonnull uploadProgress) {
        
    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        [SVProgressHUD dismiss];
        NSDictionary *resultDic = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingAllowFragments error:nil];
        
            
        success(resultDic);
        
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        
        failure(error.description);
    }];
}

总结：以上就是使用from-data进行参数提交的，比较特殊点跟之前json提交，上边两个方法的区别是一个传图片一个不传图片，不传图片的小小封装了下，直接传字典进来就行，内部自动转换。

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

另外附加上json请求格式

现在主流还是这种方式，比较方便

ps：直接复现传参数就可以使用

+ (void)zc_postRequestUrl:(NSString *)url
              parameters:(NSDictionary *)parameters
                 success:(void (^)(id responseObject))success
                 failure:(void (^)(id errorLog))failure {
    
    // 获得请求管理者
    AFHTTPSessionManager *session = [AFHTTPSessionManager manager];
    session.requestSerializer = [AFHTTPRequestSerializer serializer];
    // 设置请求格式
    session.requestSerializer = [AFJSONRequestSerializer serializer];
    [session.requestSerializer setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    session.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/json", @"text/javascript",@"text/html",@"text/plain", nil];
    [SVProgressHUD show];
    [session POST:url parameters:parameters progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {

        NSDictionary *resultDic = responseObject;
        
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {

        failure(error);
    }];
}