最近遇到一個需求：要求從客戶端傳到服務器的參數是json字符串，于是我本能的用pod裝了afn然后進行了request和response Serialization的相關設置

AFHTTPSessionManager *netMnager = [AFHTTPSessionManager manager];netMnager.requestSerializer = [AFHTTPRequestSerializer serializer];netMnager.responseSerializer = [AFHTTPResponseSerializer serializer];[netMnager.requestSerializer setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];NSDictionary *dicJson =@{@"packetHead": @{@"serviceCode":@"3005",@"token":@"fdsfdsfsfsf8f8dsfsdfsfsfsfsf0dsf0sdf",@"sign":@"FHGHGFHFGHFGHGFHGFHGFHFGHF"},@"packetBody": @{@"abc":@"你好啊"}};[netMnager POST:@"" parameters:dicJson progress:^(NSProgress * _Nonnull uploadProgress) {} success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) {} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {}];

在我看來一切都是那么的稀疏平常，可是問題就來了，服務器獲取到的數據竟然不是json字符串,而是url編碼的格式，也就是&key=value的形式，于是我蒙蔽了，好久沒遇到過這種問題了，于是請教了下百度和谷歌，最后研究afn源碼發現這是afn設置的原因或者說afn內置的原因

簡單的解析下上述代碼的運行過程：
1.調用POST方法

2.調用底層URLSESSIONDATATASK

3.創建request對象

4.對request對象進行序列化查詢

5.調用對應的request方法

6.AFHttpRequest中的方法執行，其中當沒有設置序列化方法時，會走默認的序列化方法，在此方法中最后序列化成為urlencode編碼格式，問題也出在此處

最后的優化
第一種方法，設置AFJSONRequetSerializer，此方法中參數以json對象的二進制形式傳向后臺服務器

AFHTTPSessionManager *netMnager = [AFHTTPSessionManager manager]; // netMnager.requestSerializer = [AFHTTPRequestSerializer serializer];netMnager.requestSerializer = [AFJSONRequestSerializer serializer];netMnager.responseSerializer = [AFHTTPResponseSerializer serializer]; // [netMnager.requestSerializer setValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; // [netMnager.requestSerializer setQueryStringSerializationWithBlock:^NSString * _Nonnull(NSURLRequest * _Nonnull request, id _Nonnull parameters, NSError * _Nullable __autoreleasing * _Nullable error) { // NSData *data = [NSJSONSerialization dataWithJSONObject:parameters options:0 error:nil]; // // NSString *jsonstr = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]; // NSLog(@"--- %@",jsonstr); // return jsonstr; // }];NSDictionary *dicJson =@{@"packetHead": @{@"serviceCode":@"3005",@"token":@"fdsfdsfsfsf8f8dsfsdfsfsfsfsf0dsf0sdf",@"sign":@"FHGHGFHFGHFGHGFHGFHGFHFGHF"},@"packetBody": @{@"pageType":@"你好啊"}};[netMnager POST:@"http://192.168.1.7:8888/testgateway" parameters:dicJson progress:^(NSProgress * _Nonnull uploadProgress) {} success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) {NSLog(@"--- %@",[NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:nil]);} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {NSLog(@"error = %@",error.userInfo);}];

第二種，配置request的序列化查詢方法，該方法參數以json字符串的二進制流形式傳向服務器

AFHTTPSessionManager *netMnager = [AFHTTPSessionManager manager];netMnager.requestSerializer = [AFHTTPRequestSerializer serializer];netMnager.responseSerializer = [AFHTTPResponseSerializer serializer];[netMnager.requestSerializer setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];[netMnager.requestSerializer setQueryStringSerializationWithBlock:^NSString * _Nonnull(NSURLRequest * _Nonnull request, id _Nonnull parameters, NSError * _Nullable __autoreleasing * _Nullable error) {NSData *data = [NSJSONSerialization dataWithJSONObject:parameters options:0 error:nil];NSString *jsonstr = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];NSLog(@"--- %@",jsonstr);return jsonstr;}];NSDictionary *dicJson =@{@"packetHead": @{@"serviceCode":@"3005",@"token":@"fdsfdsfsfsf8f8dsfsdfsfsfsfsf0dsf0sdf",@"sign":@"FHGHGFHFGHFGHGFHGFHGFHFGHF"},@"packetBody": @{@"pageType":@"你好啊"}};[netMnager POST:@"http://192.168.1.7:8888/testgateway" parameters:dicJson progress:^(NSProgress * _Nonnull uploadProgress) {} success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) {NSLog(@"--- %@",[NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:nil]);} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {NSLog(@"error = %@",error.userInfo);}];

轉載于:https://www.cnblogs.com/tig666666/p/7793180.html

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