Get&Post登录

 1 #import "MJViewController.h"
 2 
 3 @interface MJViewController ()  4 @property (weak, nonatomic) IBOutlet UITextField *userName;  5 @property (weak, nonatomic) IBOutlet UITextField *userPwd;  6 
 7 @property (weak, nonatomic) IBOutlet UILabel *logonResult;  8 
 9 @end
 10 
 11 @implementation MJViewController  12 /**  13  所有网络请求,统一使用异步请求!  14  
 15  在今后的开发中,如果使用简单的get/head请求,可以用NSURLConnction异步方法  16  GET查/POST增/PUT改/DELETE删/HEAD  17  
 18 GET 19 1> URL 20 2> NSURLRequest 21 3> NSURLConnction 异步 22 23 POST 24 1> URL 25 2> NSMutableURLRequest 26 .HTTPMethod = @"POST"; 27 str 从 firebug直接粘贴,或者自己写 28 变量名1=数值1&变量名2=数值2 29 30 .HTTPBody = [str dataUsingEncoding:NSUTF8StringEncoding]; 31 3> NSURLConnction 异步  32  
 33  */
 34 - (IBAction)userLogon  35 {  36  [self postLogon];  37 }  38 
 39 #pragma mark - POST登录
 40 - (void)postLogon  41 {  42     // 1. URL
 43     NSURL *url = [NSURL URLWithString:@"http://localhost/login.php"];  44     
 45     // 2. 请求(可以改的请求)
 46     NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];  47     // ? POST  48     // 默认就是GET请求
 49     request.HTTPMethod = @"POST";  50     // ? 数据体
 51     NSString *str = [NSString stringWithFormat:@"username=%@&password=%@", self.userName.text, self.userPwd.text];  52     // 将字符串转换成数据
 53     request.HTTPBody = [str dataUsingEncoding:NSUTF8StringEncoding];  54     
 55     // 3. 连接,异步
 56     [NSURLConnection sendAsynchronousRequest:request queue:[[NSOperationQueue alloc] init] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {  57         
 58         if (connectionError == nil) {  59             // 网络请求结束之后执行!  60             // 将Data转换成字符串
 61             NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];  62             
 63             // num = 2
 64             NSLog(@"%@ %@", str, [NSThread currentThread]);  65             
 66             // 更新界面
 67             [[NSOperationQueue mainQueue] addOperationWithBlock:^{  68                 self.logonResult.text = str;  69  }];  70  }  71  }];  72     
 73     // num = 1
 74     NSLog(@"come here %@", [NSThread currentThread]);  75 }  76 
 77 #pragma mark - GET登录
 78 - (void)getLogon  79 {  80     // 1. URL
 81     NSString *urlStr = [NSString stringWithFormat:@"http://localhost/login.php?username=%@&password=%@", self.userName.text, self.userPwd.text];  82     
 83     NSURL *url = [NSURL URLWithString:urlStr];  84     
 85     // 2. Request
 86     NSURLRequest *request = [NSURLRequest requestWithURL:url];  87     
 88     // 3. Connection  89     // 1> 登录完成之前,不能做后续工作!  90     // 2> 登录进行中,可以允许用户干点别的会更好!  91     // 3> 让登录操作在其他线程中进行,就不会阻塞主线程的工作  92     // 4> 结论:登陆也是异步访问,中间需要阻塞住
 93     [NSURLConnection sendAsynchronousRequest:request queue:[[NSOperationQueue alloc] init] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {  94         
 95         if (connectionError == nil) {  96             // 网络请求结束之后执行!  97             // 将Data转换成字符串
 98             NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];  99             
100             // num = 2
101             NSLog(@"%@ %@", str, [NSThread currentThread]); 102             
103             // 更新界面
104             [[NSOperationQueue mainQueue] addOperationWithBlock:^{ 105                 self.logonResult.text = @"登录完成"; 106  }]; 107  } 108  }]; 109     
110     // num = 1
111     NSLog(@"come here %@", [NSThread currentThread]); 112     
113     NSURLResponse *response = nil; 114     // 1. &response真的理解了吗? 115     // 2. error:为什么是NULL,而不是nil 116     // NULL是C语言的 = 0 117     // 在C语言中,如果将指针的地址指向0就不会有危险 118     
119     // nil是OC的,是一个空对象发送消息不会出问题 120 // [response MIMEType];
121     [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:NULL]; 122 } 123 
124 @end