Post && Get
#import "MViewController.h"
@interface MViewController ()
@property (weak, nonatomic) IBOutlet UITextField *userName;
@property (weak, nonatomic) IBOutlet UITextField *userPwd;
@property (weak, nonatomic) IBOutlet UILabel *logonResult;
@end
@implementation MJViewController
/**
所有网络请求,统一使用异步请求!
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
GET查/POST增/PUT改/DELETE删/HEAD
GET
1> URL
2> NSURLRequest
3> NSURLConnction 异步
POST
1> URL
2> NSMutableURLRequest
.httpMethod = @"POST";
str 从 firebug直接粘贴,或者自己写
变量名1=数值1&变量名2=数值2
.httpData = [str dataUsingEncoding:NSUTF8StringEncoding];
3> NSURLConnction 异步
*/
- (IBAction)userLogon
{
[self postLogon];
}
#pragma mark - POST登录
- (void)postLogon
{
// 1. URL
NSURL *url = [NSURL URLWithString:@"http://localhost/login.php"];
// 2. 请求(可以改的请求)
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
// ? POST
// 默认就是GET请求
request.HTTPMethod = @"POST";
// ? 数据体
NSString *str = [NSString stringWithFormat:@"username=%@&password=%@", self.userName.text, self.userPwd.text];
// 将字符串转换成数据
request.HTTPBody = [str dataUsingEncoding:NSUTF8StringEncoding];
// 3. 连接,异步
[NSURLConnection sendAsynchronousRequest:request queue:[[NSOperationQueue alloc] init] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
if (connectionError == nil) {
// 网络请求结束之后执行!
// 将Data转换成字符串
NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
// num = 2
NSLog(@"%@ %@", str, [NSThread currentThread]);
// 更新界面
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
self.logonResult.text = str;
}];
}
}];
// num = 1
NSLog(@"come here %@", [NSThread currentThread]);
}
#pragma mark - GET登录
- (void)getLogon
{
// 1. URL
NSString *urlStr = [NSString stringWithFormat:@"http://localhost/login.php?username=%@&password=%@", self.userName.text, self.userPwd.text];
NSURL *url = [NSURL URLWithString:urlStr];
// 2. Request
NSURLRequest *request = [NSURLRequest requestWithURL:url];
// 3. Connection
// 1> 登录完成之前,不能做后续工作!
// 2> 登录进行中,可以允许用户干点别的会更好!
// 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
// 4> 结论:登陆也是异步访问,中间需要阻塞住
[NSURLConnection sendAsynchronousRequest:request queue:[[NSOperationQueue alloc] init] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
if (connectionError == nil) {
// 网络请求结束之后执行!
// 将Data转换成字符串
NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
// num = 2
NSLog(@"%@ %@", str, [NSThread currentThread]);
// 更新界面
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
self.logonResult.text = @"登录完成";
}];
}
}];
// num = 1
NSLog(@"come here %@", [NSThread currentThread]);
NSURLResponse *response = nil;
// 1. &response真的理解了吗?
// 2. error:为什么是NULL,而不是nil
// NULL是C语言的 = 0
// 在C语言中,如果将指针的地址指向0就不会有危险
// nil是OC的,是一个空对象发送消息不会出问题
// [response MIMEType];
[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:NULL];
}
@end
//例1
#import "MWebDelegateViewController.h"
#import "NSString+Password.h"
@interface MWebDelegateViewController () <NSURLConnectionDataDelegate>
@property (weak, nonatomic) IBOutlet UITextField *userName;
@property (weak, nonatomic) IBOutlet UITextField *userPwd;
@property (weak, nonatomic) IBOutlet UILabel *logonResult;
// 从服务器接收到的数据,进行拼接工作
@property (nonatomic, strong) NSMutableData *data;
@property (nonatomic, strong) NSString *myPwd;
@end
@implementation MJWebDelegateViewController
/**
1. 用户密码明文只能出现在用户登录窗口,不能再其他任何地方出现密码明文
2. 其他位置,无论是服务器,还是本地,还是传输过程中,统一使用加密后的算法.
*/
- (NSString *)myPwd
{
return [self.userPwd.text myMD5];
}
- (IBAction)userLogon
{
[self getLogon];
}
- (void)getLogon
{
// 1. URL
NSString *urlStr = [NSString stringWithFormat:@"http://localhost/login.php?username=%@&password=%@", self.userName.text, self.myPwd];
NSLog(@"%@", self.myPwd);
NSURL *url = [NSURL URLWithString:urlStr];
// 2. Request
NSURLRequest *request = [NSURLRequest requestWithURL:url];
// 3. 连接,已经10多岁了
// 是一个很古老的技术
NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate:self];
// 开始工作,在很多多线程技术中,start run
dispatch_async(dispatch_queue_create("demo", DISPATCH_QUEUE_CONCURRENT), ^{
[connection start];
});
}
#pragma mark - NSURLConnectionDataDelegate代理方法
#pragma mark 接受到响应
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
// 准备工作
// 按钮点击就会有网络请求,为了避免重复开辟空间
if (!self.data) {
self.data = [NSMutableData data];
} else {
[self.data setData:nil];
}
}
#pragma mark 接收到数据,如果数据量大,例如视频,会被多次调用
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
// 拼接数据,二进制流的体现位置
[self.data appendData:data];
}
#pragma mark 接收完成,做最终的处理工作
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
// 最终处理
NSString *str = [[NSString alloc] initWithData:self.data encoding:NSUTF8StringEncoding];
NSLog(@"%@ %@", str, [NSThread currentThread]);
}
#pragma mark 出错处理,网络的出错可能性非常高
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog(@"%@", error.localizedDescription);
}
@end
