Http 请求_frech请求-优快云博客

本文链接：https://blog.youkuaiyun.com/freshForIphone/article/details/7357513

本文介绍了在iOS开发中如何使用不同的方法进行网络请求，包括使用NSString、NSData、NSURLRequest结合NSURLConnection进行同步及异步请求的具体实现，并展示了如何设置HTTP头部信息、超时时间和处理响应。

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同步方式

1,使用NSString

NSString* str = [NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://baidu.com"] encoding:NSUTF8StringEncoding error:nil];

2,使用NSData

NSData* data = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://baidu.com"]];

3,使用NSURLRequest &NSURLConnection

	NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://baidu.com"]];
	NSHTTPURLResponse* response = nil;									
	NSData* responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil];
	NSDictionary* headArr = [response allHeaderFields];
	NSLog(@"%@",headArr);

headArr的输出如下：

{
    "Accept-Ranges" = bytes;
    "Cache-Control" = "max-age=86400";
    Connection = "Keep-Alive";
    "Content-Length" = 81;
    "Content-Type" = "text/html";
    Date = "Thu, 15 Mar 2012 08:11:50 GMT";
    Etag = "\"51-4b4c7d90\"";
    Expires = "Fri, 16 Mar 2012 08:11:50 GMT";
    "Last-Modified" = "Tue, 12 Jan 2010 13:48:00 GMT";
    Server = Apache;
}

[response statusCode] 可以得到http 返回值，比如200表示成功。

4.使用NSURLRequest &NSURLConnection 设置超时时间

		//[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://kkkkkkk.com"] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:3.0];	
NSMutableURLRequest* request   = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://kkkkkkk.com"]];
	NSURLResponse* response = nil;
	[request setTimeoutInterval:4.0];
	NSData* data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil];

异步方式：

1,使用NSURLRequest &NSURLConnection

	NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://xxxx"]];
	NSHTTPURLResponse* response = nil;		
	[request setHTTPMethod:@"POST"];
	[request setHTTPBody:@"post Body Data"];
	NSString *contentType = [NSString stringWithFormat:@"multipart/form-data;"];
	[request addValue:contentType forHTTPHeaderField: @"Content-Type"];
	NSURLConnection* conn = [NSURLConnection connectionWithRequest:request delegate:self];

对应的需要实现对应的回调函数

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response;

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data ;

- (void)connectionDidFinishLoading:(NSURLConnection *)connection ;

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error ;