iOS网络请求

1.NSData

NSData相当于一个GET请求

 NSString *urlStrig = @"http://888s?name=张三&pwd=123e";
   urlStrig = [urlStrig stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]]; NSURL *url = [NSURL URLWithString:urlStrig]; NSData *data = [NSData dataWithContentsOfURL:url]; 

2.NSURLConnection

NSString *urlStrig = @"http://888s?name=张三&pwd=123e";
    urlStrig = [urlStrig stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]]; NSURL *url = [NSURL URLWithString:urlStrig]; NSURLRequest *request = [NSURLRequest requestWithURL:url];//默认为GET //同步请求 NSURLResponse *response = nil; NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil]; //异步请求 [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) { }];
一般http的GET请求使用sendAsynchronousRequest发送一个异步请求就可以完成了，如果要下载大文件最好使用代理方式来处理

//此方法会初始化一个NSURLConnection对象，并且会马上发送请求
//self遵守的代理为NSURLConnectionDataDelegate
[NSURLConnection connectionWithRequest:request delegate:self]

NSURLConnectionDataDelegate代理方法

/**
 接受到服务器的响应就会调用此方法

 @param response 响应,可以通过响应回去文件的大小
 */
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
}

/** 接收到服务器返回的实体数据时调用 此方法可能会被调用多次 @param data 本次返回的数据 */ - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{ } /** 所有数据接受完毕调用 通常在该方法中处理服务器返回的数据 */ - (void)connectionDidFinishLoading:(NSURLConnection *)connection{ } /** 请求错误时会调用 */ - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{ 

}
2POST
参数写在请求体中

NSString *urlStrig = @"http://ip:port/login";
urlStrig = [urlStrig stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]]; NSURL *url = [NSURL URLWithString:urlStrig]; NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; request.HTTPMethod = @"POST"; request.HTTPBody = [@"account=12345&pwd=123" dataUsingEncoding:NSUTF8StringEncoding]; [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) { }];

3.NSURLSession

使用方法为获取session对象，使用session创建一个请求任务，开始任务即可。
请求任务:
NSURLSessionTask是URL会话中任务的基类,一般不直接使用，主要使用的是其子类

1.获取NSURLSession对象
NSURLSession *session = [NSURLSession sharedSession]; 2.使用session对象创建一个普通的请求任务 NSURL *url = [NSURL URLWithString:@""]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) { }]; 3.开启任务 [task resume];

4.AFNetWorking

NSMutableDictionary *param = [NSMutableDictionary dictionary]; param[@"username"] = @"张三"; param[@"age"] = @(20); NSString *url = @""; AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager]; //请求超时时间 manager.requestSerializer.timeoutInterval = 30; //告诉返回的数据（responseObject）为NSDictionary对象,默认为AFJSONResponseSerializer manager.responseSerializer = [AFJSONResponseSerializer serializer]; //告诉返回的数据（responseObject）为NSXMLParser对象 //manager.responseSerializer = [AFXMLParserResponseSerializer serializer]; //告诉返回的数据（responseObject）为原数据（NSData） //manager.responseSerializer = [AFHTTPResponseSerializer serializer]; [manager GET:url parameters:param success:^(AFHTTPRequestOperation *operation, id responseObject) { } failure:^(AFHTTPRequestOperation *operation, NSError *error) { }];

//文件上传

NSString *urlString = @"";
AFHTTPRequestOperationManager *mgr = [AFHTTPRequestOperationManager manager]; //普通参数 NSMutableDictionary *params = [NSMutableDictionary dictionary]; [params setObject:@"张三" forKey:@"username"]; [mgr POST:urlString parameters:params constructingBodyWithBlock:^(id<AFMultipartFormData> formData) { NSData *imageData = UIImagePNGRepresentation([UIImage imageNamed:@""]); /** 拼接文件参数 @fileData : 要上传的文件数据 @name : 后台定义文件的参数名 @fileName ： 上传到服务器的文件名称 @mimeType : 上传的文件类型 */ [formData appendPartWithFileData:imageData name:@"file" fileName:@"text.png" mimeType:@"image/png"]; } success:^(AFHTTPRequestOperation *operation, id responseObject) { } failure:^(AFHTTPRequestOperation *operation, NSError *error) { }];