iOS_网络编程

 1 -(void)loginByGet
 2 {
 3     //1.创建NSURL对象，设计连接的地址
 4     NSString *strURL =[NSString stringWithFormat:@"http://127.0.0.1/userManager/login.php?username=%@&password=%@",self.userNameTextField.text,self.passwordTextField.text];
 5     NSURL *url = [NSURL URLWithString:strURL];
 6     
 7     //2.创建NSURLRequest请求对象
 8     NSURLRequest *request = [NSURLRequest requestWithURL:url];
 9     /**
10      *  NSURLReqest 如果是不可变的，则不可设置超时时间。
11      */
12     //3.创建NSURLConnection连接对象
13     NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate:self];
14 
15     //4.向服务器发送请求
16     [connection start];
17 }

 1 -(void)loginByPost
 2 {
 3     //1.创建NSURL对象，设计连接的地址
 4     NSString *strURL = @"http://127.0.0.1/userManager/login.php";
 5     NSURL *url = [NSURL URLWithString:strURL];
 6     
 7     //2.创建NSURLRequest请求对象
 8     NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
 9     [request setTimeoutInterval:5.0];//设置连接超时的等待时间；
10     [request setHTTPMethod:@"post"];//设置请求方式为POST 11     //设置post带的数据
12     NSString *strBody = [NSString stringWithFormat:@"submit=1&username=%@&password=%@",self.userNameTextField.text,self.passwordTextField.text];
13     NSData *dataBody = [strBody dataUsingEncoding:NSUTF8StringEncoding];
14     //通过协议头进行携带数据
15     [request setHTTPBody:dataBody];
16     
17     //3.创建NSURLConnection连接对象
18     NSURLConnection *conn = [NSURLConnection connectionWithRequest:request delegate:self];
19     
20     //向服务器发送请求
21     [conn start];
22     
23 }

 1 -(void)loginByPost
 2 {
 3     //1.创建NSURL对象，设计连接的地址
 4     NSString *strURL = @"http://127.0.0.1/userManager/login.php";
 5     NSURL *url = [NSURL URLWithString:strURL];
 6     //2.创建NSURLRequest请求对象
 7     NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
 8     [request setTimeoutInterval:5.0];//超时时间
 9     [request setHTTPMethod:@"post"];//设置使用post方式
10     //设置post带的数据
11     NSString *strBody = [NSString stringWithFormat:@"submit=1&username=%@&password=%@",self.userNameTextField.text,self.passwordTextField.text];
12     NSData *dataBody = [strBody dataUsingEncoding:NSUTF8StringEncoding];
13     //通过协议头进行携带数据
14     [request setHTTPBody:dataBody];
15     
16     //3.创建NSURLConnection连接对象
17     NSURLConnection *conn = [NSURLConnection connectionWithRequest:request delegate:self];
18     //4.向服务器发送请求
19     [conn start];
20     
21     //清理数据
22     NSData *data = [@"" dataUsingEncoding:NSUTF8StringEncoding];
23     [self.allDatas setData:data];
24     
25 }

 1 -(void)asyncLogin
 2 {
 3     //1.创建NSURL对象，设置连接的地址
 4     NSString *strURL = @"http://127.0.0.1//userManager/login.php";
 5     NSURL *url = [NSURL URLWithString:strURL];
 6     
 7     //2.创建NSURLRequest请求对象(POST)
 8     NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
 9     //设置请求方式
10     [request setHTTPMethod:@"POST"];
11     //在异步请求方式中，通过协议体进行携带数据传送
12     NSString *strBody = [NSString stringWithFormat:@"submit=1&username=%@&password=%@",self.userNameTextField.text,self.passwordTextField.text];
13     NSData *data = [strBody dataUsingEncoding:NSUTF8StringEncoding];
14     [request setHTTPBody:data];
15     //3.创建异步请求
16     //block将代码进行封装，作为一个参数加到这个方法中，当数据传输完成之后，才调用block进行输出。当调用block时，将接收到的服务器响应、数据，还有出错信息，传送到block中，进行判断输出。
17     [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
18         if (connectionError) {
19             NSLog(@"Error reason:%@",connectionError);
20         }
21         else
22         {
23             //设置编码
24             unsigned long encoding = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
25             //将从服务器收到的数据进行输出
26             NSString *request = [[NSString alloc]initWithData:data encoding:encoding];
27             NSLog(@"%@",request);
28         }
29     }];
30 }

 1 #pragma mark - NSURLConnection代理方法
 2 //收到服务器返回的数据，可能会执行很多次，因为数据如果很大的话，会进行分包发送
 3 -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
 4 {
 5     //将所有数据段进行拼接，将新接收的数据段进行追加
 6     [self.allDatas appendData:data];
 7 }
 8 //连接过程中出错处理
 9 -(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
10 {
11     NSLog(@"error reason:%@",error);
12 }
13 //数据接收完毕，做最后的数据处理
14 -(void)connectionDidFinishLoading:(NSURLConnection *)connection
15 {
16     //当传输的文件中，如果含有汉字的，系统无法识别这种编码
17     unsigned long encoding = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
18     //按照encoding这种编码方式，将接收到数据段进行输出
19     NSString *request = [[NSString alloc]initWithData:self.allDatas encoding:encoding];
20     NSLog(@"%@",request);
21 }

1 //以post方式传数据时返回数据传输的进度,仅限于以post方式
2 -(void)connection:(NSURLConnection *)connection didSendBodyData:(NSInteger)bytesWritten totalBytesWritten:(NSInteger)totalBytesWritten totalBytesExpectedToWrite:(NSInteger)totalBytesExpectedToWrite
3 {
4     NSLog(@"bytes:%ld,totalBytes:%ld,totalBytesExpected:%ld",bytesWritten,totalBytesWritten,totalBytesExpectedToWrite);
5 }