1 #import "ViewController.h" 2  3 @interface ViewController () 4  5 @end 6  7 @implementation ViewController 8 -(void)touchesBegan:(NSSet
     
       *)touches withEvent:(UIEvent *)event 9 {10     [self post];11 }12 13 -(void)post14 {15     //1.确定请求路径16     NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/login"];17     18     //2.创建可变请求对象19     NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];20     21     //3.修改请求方法,POST必须大写22     request.HTTPMethod = @"POST";23     24     //设置属性,请求超时25     request.timeoutInterval = 10;26     27     //设置请求头User-Agent28     //注意:key一定要一致(用于传递数据给后台)29     [request setValue:@"ios 10.1" forHTTPHeaderField:@"User-Agent"];30     31     //4.设置请求体信息,字符串--->NSData32     request.HTTPBody = [@"username=520it&pwd=123&type=JSON" dataUsingEncoding:NSUTF8StringEncoding];33     34     //5.发送请求35     [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {36        37         //6.解析数据,NSData --->NSString38         NSLog(@"%@",[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]);39     }];40 }41 42 @end