iOS网络请求之NSMutableURLRequest

NSMutableURLRequest是NSURLRequest的子类，常用方法有

//1、设置请求超时等待时间（超过这个时间就算超时，请求失败）

- (void)setTimeoutInterval:(NSTimeInterval)seconds;

//2、设置请求方法（比如GET和POST）

- (void)setHTTPMethod:(NSString*)method;

//3、设置请求体

- (void)setHTTPBody:(NSData*)data;

//4、设置请求头

- (void)setValue:(NSString*)value forHTTPHeaderField:(NSString*)field;

创建GET请求

NSString *urlStr = [@"http://xxxx/login?username=123&pwd=123" stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

NSURL *url = [NSURL URLWithString:urlStr];

创建POST请求

NSString *urlStr = @"http://xxxx/login";

NSURL *url= [NSURL URLWithString:urlStr];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

request.HTTPMethod = @"POST";

// 请求体

NSString *bodyStr = @"username=123&pwd=123";

request.HTTPBody = [bodyStr dataUsingEncoding:NSUTF8StringEncoding];

设置请求头，用POST请求，给服务器发送JSON数据

[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];