OC -网络请求 - NSURLConnection - GET

 ?1 #import "ViewController.h" ?2 ??3 @interface ViewController ()<NSURLConnectionDataDelegate> ?4 /** 注释 */ ?5 @property (nonatomic, strong) NSMutableData *resultData; ?6 @end ?7 ??8 @implementation ViewController ?9 ?10 #pragma mark ---------------------- 11 #pragma mark lazy loading 12 -(NSMutableData *)resultData 13 { 14 ????if (_resultData == nil) { 15 ????????_resultData = [NSMutableData data]; 16 ????} 17 ????return _resultData; 18 } 19 #pragma mark ---------------------- 20 #pragma mark Events 21 -(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event 22 { 23 ????[self delegate]; 24 } 25 ?26 /* 27 ?请求:请求头(NSURLRequest默认包含)+请求体(GET没有) 28 ?响应:响应头(真实类型--->NSHTTPURLResponse)+响应体(要解析的数据) 29 ?*/ 30 #pragma mark ---------------------- 31 #pragma mark Methods 32 -(void)sync 33 { 34 ????/* 35 ?????GET:http://120.25.226.186:32812/login?username=123&pwd=456&type=JSON 36 ?????协议+主机地址+接口名称+?+参数1&参数2&参数3 37 ?????post:http://120.25.226.186:32812/login 38 ?????协议+主机地址+接口名称 39 ?????*/ 40 ????//GET,没有请求体 41 ????//1.确定请求路径 42 ????NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/login?username=520it&pwd=520it&type=JSON"]; 43 ?????44 ????//2.创建请求对象 45 ????//请求头不需要设置(默认的请求头) 46 ????//请求方法--->默认为GET 47 ????NSURLRequest *request = [[NSURLRequest alloc]initWithURL:url]; 48 ?????49 ????//3.发送请求 50 ????//真实类型:NSHTTPURLResponse 51 ????NSHTTPURLResponse *response = nil; 52 ????/* 53 ?????第一个参数:请求对象 54 ?????第二个参数:响应头信息 55 ?????第三个参数:错误信息 56 ?????返回值:响应体 57 ?????*/ 58 ????//该方法是阻塞的,即如果该方法没有执行完则后面的代码将得不到执行 59 ????NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil]; 60 ?????61 ????//4.解析 data--->字符串 62 ????//NSUTF8StringEncoding 63 ????NSLog(@"%@",[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]); 64 ?????65 ????NSLog(@"%zd",response.statusCode); 66 } 67 ?68 -(void)async 69 { 70 ????//1.确定请求路径 71 ????NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/login?username=520it&pwd=520it&type=JSON"]; 72 ?????73 ????//2.创建请求对象 74 ????//请求头不需要设置(默认的请求头) 75 ????NSURLRequest *request = [[NSURLRequest alloc]initWithURL:url]; 76 ?????77 ????//3.发送异步请求 78 ????/* 79 ?????第一个参数:请求对象 80 ?????第二个参数:队列 决定代码块completionHandler的调用线程 81 ?????第三个参数:completionHandler 当请求完成(成功|失败)的时候回调 82 ????????response:响应头 83 ????????data:响应体 84 ????????connectionError:错误信息 85 ?????*/ 86 ????[NSURLConnection sendAsynchronousRequest:request queue:[[NSOperationQueue alloc]init] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) { 87 ?????????88 ????????89 ????????//4.解析数据 90 ????????NSLog(@"%@",[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]); 91 ?????????92 ????????NSHTTPURLResponse *res = (NSHTTPURLResponse *)response; 93 ????????NSLog(@"%zd",res.statusCode); 94 ????????NSLog(@"%@",[NSThread currentThread]); 95 ????}]; 96 } 97 ?98 -(void)delegate 99 {100 ????//1.确定请求路径101 ????NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/login?username=123&pwd=123&type=JSON"];102 ????103 ????//2.创建请求对象104 ????NSURLRequest *request = [NSURLRequest requestWithURL:url];105 ????106 ????//3.设置代理,发送请求107 ????//3.1108 ????//[NSURLConnection connectionWithRequest:request delegate:self];109 ????110 ????//3.2111 ????//[[NSURLConnection alloc]initWithRequest:request delegate:self];112 ????113 ????//3.3 设置代理,时候发送请求需要检查startImmediately的值114 ????//(startImmediately == YES 会发送 | startImmediately == NO 则需要调用start方法)115 ????NSURLConnection * connect = [[NSURLConnection alloc]initWithRequest:request delegate:self startImmediately:NO];116 ????117 ????//调用开始方法118 ????[connect start];119 ????120 // ???[connect cancel];//取消121 }122 123 #pragma mark ----------------------124 #pragma mark NSURLConnectionDataDelegate125 //1.当接收到服务器响应的时候调用126 -(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response127 {128 ????NSLog(@"%s",__func__);129 }130 131 //2.接收到服务器返回数据的时候调用,调用多次132 -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data133 {134 ?????NSLog(@"%s",__func__);135 ????136 ????//拼接数据137 ????[self.resultData appendData:data];138 }139 //3.当请求失败的时候调用140 -(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error141 {142 ?????NSLog(@"%s",__func__);143 }144 145 //4.请求结束的时候调用146 -(void)connectionDidFinishLoading:(NSURLConnection *)connection147 {148 ?????NSLog(@"%s",__func__);149 ????150 ????NSLog(@"%@",[[NSString alloc]initWithData:self.resultData encoding:NSUTF8StringEncoding]);151 }152 @end