• ios开发网络篇—Get请求和Post请求


    简单说明:建议提交用户的隐私数据一定要使用Post请求 
    相对Post请求而言,Get请求的所有参数都直接暴露在URL中,请求的URL一般会记录在服务器的访问日志中,而服务器的访问日志是黑客攻击的重点对象之一 
    用户的隐私数据如登录密码,银行帐号等

    示例代码

    #define CURRENT_SCREEN_WIDTH     [UIScreen mainScreen].bounds.size.width
    #define CURRENT_SCREEN_HEIGHT     ([UIScreen mainScreen].bounds.size.height - 64)
    #define BUTTON_WIDTH     80
    #define BUTTON_HEIGHT    40
    
    @interface ViewController ()
    //GET 请求
    @property(nonatomic,strong) UIButton *getButton;
    //POST 请求
    @property(nonatomic,strong) UIButton *postButton;
    @end
    
    @implementation ViewController
    
    - (void)viewDidLoad {
        [super viewDidLoad];
        
        _getButton = [[UIButton alloc] initWithFrame:CGRectMake(CURRENT_SCREEN_WIDTH/2 - BUTTON_WIDTH/2,
                                                                 CURRENT_SCREEN_HEIGHT/2 - BUTTON_HEIGHT,
                                                                 BUTTON_WIDTH,
                                                                 BUTTON_HEIGHT)];
        [_getButton setTitle:@"GET 请求" forState:UIControlStateNormal];
        [_getButton setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
        [_getButton addTarget:self
                        action:@selector(getClick)
              forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:_getButton];
        
        _postButton = [[UIButton alloc] initWithFrame:CGRectMake(CURRENT_SCREEN_WIDTH/2 - BUTTON_WIDTH/2,
                                                                 _getButton.frame.origin.y + _getButton.frame.size.height + 60,
                                                                 BUTTON_WIDTH,
                                                                 BUTTON_HEIGHT)];
        [_postButton setTitle:@"POST 请求" forState:UIControlStateNormal];
        [_postButton setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
        [_postButton addTarget:self
                        action:@selector(postClick)
              forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:_postButton];
    }
    
    /* get 请求 */
    -(void)getClick{
        //请求 URL
        NSString* urlStr = [NSString stringWithFormat:@"https://m.che168.com/beijing/?pvareaid=%d",110100];
        //封装成 NSURL
        NSURL* url = [NSURL URLWithString:urlStr];
    
        //初始化 请求对象
        NSURLRequest* request = [[NSURLRequest alloc] initWithURL:url];
        //也可以这样初始化对象
        //NSURLRequest* request = [NSURLRequest requestWithURL:url];
        
        //发送请求  默认为 GET 请求
        //1 、获得会话对象
        NSURLSession *session = [NSURLSession sharedSession];
        // 2、第一个参数:请求对象
        //      第二个参数:completionHandler回调(请求完成【成功|失败】的回调)
        //      data:响应体信息(期望的数据)
        //      response:响应头信息,主要是对服务器端的描述
        //      error:错误信息,如果请求失败,则error有值
        NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
            if(!error){
                NSLog(@"请求加载成功。。。");
                //说明:(此处返回的数据是JSON格式的,因此使用NSJSONSerialization进行反序列化处理)
                // NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
                //如果是字符串则直接取出
                NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
                NSLog(@"GET 请求返回的结果是:%@",[str substringToIndex: 300]);
            }
        }];
        //执行任务
        [dataTask resume];
        
        /* ------------ ios9 之前请求方法,之后改成 NSURLSession 请求  --------------
        [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
            if(!connectionError){
                NSLog(@"加载成功。。。");
                NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
                NSLog(@"加载的内容是:%@",[str substringToIndex:200]);
            }else{
                NSLog(@"加载失败");
            }
        }];
        */
    }
    
    
    /* POST 请求 */
    -(void)postClick{
        NSString *urlStr = [NSString stringWithFormat:@"https://m.che168.com/"];
        //转码
        // stringByAddingPercentEscapesUsingEncoding 只对 `#%^{}[]|"<> 加空格共14个字符编码,不包括”&?”等符号), ios9将淘汰
        // ios9 以后要换成 stringByAddingPercentEncodingWithAllowedCharacters 这个方法进行转码
        urlStr = [urlStr stringByAddingPercentEncodingWithAllowedCharacters:[[NSCharacterSet characterSetWithCharactersInString:@"?!@#$^&%*+,:;='"`<>()[]{}/\| "] invertedSet]];
        NSURL *url = [NSURL URLWithString:urlStr];
        
        //创建会话对象
        NSURLSession *session = [NSURLSession sharedSession];
        
        //创建请求对象
        NSMutableURLRequest *request =[[NSMutableURLRequest alloc] initWithURL:url];
        [request setHTTPMethod:@"POST"];
        [request setHTTPBody:[@"a=1&b=2&c=3&type=json" dataUsingEncoding:NSUTF8StringEncoding]];
        
        //根据会话对象创建一个 Task(发送请求)
        NSURLSessionDataTask* dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
            if(!error){
                //8.解析数据
                // NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
                // NSLog(@"%@",dict);
                NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
                NSLog(@"POST 加载的内容是:%@",[str substringToIndex:200]);
            }else{
                NSLog(@"请求发生错误:%@", [error description]);
            }
        }];
        [dataTask resume]; //执行任务
    }
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  • 原文地址:https://www.cnblogs.com/jiuyi/p/10114231.html
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