iOS应用中发送HTTP的get请求以及HTTP异步请求的方法

Http get 请求

// 组合一个搜索字符串

    NSString *urlStr = [NSString stringWithFormat:@"http://www.baidu.com/s?wd=%@", @"php"];

    // 字符串转化为URL

    NSURL *url = [NSURL URLWithString:urlStr];

     

//    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];

//    [request setURL:url];

//    [request setHTTPMethod:@"POST"];

//    [request setTimeoutInterval:60];

//    [request setHTTPBody:_data];

//    [request setValue:@"ttt" forHTTPHeaderField:@"cookies"];

    

    // url转化为一个请求

    NSURLRequest *request = [NSURLRequest requestWithURL:url];

    // 状态请求

    NSURLResponse *response;

    // 链接一个请求

    NSData *resultData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil];

    // 返回数据转为字符串

    NSData *dataString = [[NSString alloc] initWithData:resultData encoding:NSUTF8StringEncoding];

    NSLog(@"%@", dataString);

// 解析json吧

Http异步请求

- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view.

     

    _data = [[NSMutableData alloc] init];

     

    // 组合一个搜索字符串

    NSString *urlStr = [NSString stringWithFormat:@"http://www.baidu.com/s?wd=%@", @"php"];

    NSURL *url = [NSURL URLWithString:urlStr];

     

    NSURLRequest *request = [NSURLRequest requestWithURL:url];

     

    //发起请求，定义代理

    [NSURLConnection connectionWithRequest:request delegate:self];

     

}

 

// 分批返回数据

- (void)connection:(NSURLConnection *) connection didReceiveData:(NSData *)data {

    [_data appendData:data];

    NSLog(@"%@", _data);

}

 

// 数据完全返回完毕

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {

    NSString *dataString =  [[NSString alloc] initWithData:_data encoding:NSUTF8StringEncoding];

    NSLog(@"%@", dataString);

}