1 #import "HMViewController.h"
2 #import "MBProgressHUD+MJ.h"
3
4 @interface HMViewController () <NSURLConnectionDataDelegate>
5 @property (weak, nonatomic) IBOutlet UITextField *usernameField;
6 @property (weak, nonatomic) IBOutlet UITextField *pwdField;
7 - (IBAction)login;
8
9 /**
10 * 用来存放服务器返回的所有数据
11 */
12 @property (nonatomic, strong) NSMutableData *responseData;
13 @end
14
15 @implementation HMViewController
16
17 - (void)viewDidLoad
18 {
19 [super viewDidLoad];
20
21 }
22
23 /**
24 * 登录逻辑
25 */
26 - (IBAction)login
27 {
28 // 1.表单验证(输入验证)
29 NSString *username = self.usernameField.text;
30 if (username.length == 0) { // 没有输入用户名
31 [MBProgressHUD showError:@"请输入用户名"];
32 return;
33 }
34
35 NSString *pwd = self.pwdField.text;
36 if (pwd.length == 0) { // 没有输入密码
37 [MBProgressHUD showError:@"请输入密码"];
38 return;
39 }
40
41 // 弹框
42 [MBProgressHUD showMessage:@"正在拼命登录中..."];
43
44 // 2.发送请求给服务器(带上帐号和密码)
45 // GET请求:请求行\请求头
46
47 // 2.1.设置请求路径
48 NSString *urlStr = [NSString stringWithFormat:@"http://192.168.1.200:8080/MJServer/login?username=%@&pwd=%@", username, pwd];
49
50 // 转码
51 urlStr = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
52
53 // URL里面不能包含中文
54 NSURL *url = [NSURL URLWithString:urlStr];
55
56 // 2.2.创建请求对象
57 NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; // 默认就是GET请求
58 request.timeoutInterval = 5; // 设置请求超时
59
60 // 2.3.发送请求
61 [self sendAsync:request];
62
63 NSLog(@"---------已经发出请求");
64 }
65
66 #pragma mark - NSURLConnectionDataDelegate 代理方法
67 /**
68 * 请求错误(失败)的时候调用(请求超时\断网\没有网, 一般指客户端错误)
69 */
70 - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
71 {
72 NSLog(@"connection:didFailWithError:");
73 [MBProgressHUD hideHUD];
74
75 [MBProgressHUD showError:@"网络繁忙, 请稍后再试"];
76 }
77
78 /**
79 * 当接受到服务器的响应(连通了服务器)就会调用
80 */
81 - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
82 {
83 NSLog(@"connection:didReceiveResponse:");
84
85 // 初始化数据
86 self.responseData = [NSMutableData data];
87 }
88
89 /**
90 * 当接受到服务器的数据就会调用(可能会被调用多次, 每次调用只会传递部分数据)
91 */
92 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
93 {
94 NSLog(@"connection:didReceiveData:");
95
96 // 拼接(收集)数据
97 [self.responseData appendData:data];
98 }
99
100 /**
101 * 当服务器的数据接受完毕后就会调用
102 */
103 - (void)connectionDidFinishLoading:(NSURLConnection *)connection
104 {
105 NSLog(@"connectionDidFinishLoading:");
106
107 // 隐藏HUD
108 [MBProgressHUD hideHUD];
109
110 // 解析服务器返回的数据
111 NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:self.responseData options:NSJSONReadingMutableLeaves error:nil];
112 NSString *error = dict[@"error"];
113 if (error) { // 登录失败
114 [MBProgressHUD showError:error];
115 } else { // 登录成功
116 NSString *success = dict[@"success"];
117 [MBProgressHUD showSuccess:success];
118 }
119 }
120
121 /**
122 * 发送异步请求的方式2: start方法, 代理
123 */
124 - (void)sendAsync2:(NSURLRequest *)request
125 {
126 NSURLConnection *conn = [NSURLConnection connectionWithRequest:request delegate:self];
127 [conn start]; // 异步执行
128 }
129
130 /**
131 * 发送异步请求的方式1: 类方法, block
132 */
133 - (void)sendAsync:(NSURLRequest *)request
134 {
135 NSOperationQueue *queue = [NSOperationQueue mainQueue];
136 [NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) { // 当请求结束的时候调用 (拿到了服务器的数据, 请求失败)
137
138 // 隐藏HUD (刷新UI界面, 一定要放在主线程, 不能放在子线程)
139 [MBProgressHUD hideHUD];
140
141 /**
142 解析data :
143 {"error":"用户名不存在"}
144 {"error":"密码不正确"}
145 {"success":"登录成功"}
146 */
147 if (data) { // 请求成功
148 NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
149 NSString *error = dict[@"error"];
150 if (error) { // 登录失败
151 [MBProgressHUD showError:error];
152 } else { // 登录成功
153 NSString *success = dict[@"success"];
154 [MBProgressHUD showSuccess:success];
155 }
156 } else { // 请求失败
157 [MBProgressHUD showError:@"网络繁忙, 请稍后再试"];
158 }
159 }];
160 }
161
162 @end
