IOS之数据请求
为方便区分, 现在viewDidLoad创建4个Button :GET 同步请求 , POST同步请求, GET异步请求,POSt异步请求
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[self.view addSubview:button];
button.frame = CGRectMake(40, 40, 80, 50);
button.backgroundColor = [UIColor cyanColor];
[button addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside ];
[button setTitle:@"get 同步" forState:UIControlStateNormal];
UIButton *button1 = [UIButton buttonWithType:UIButtonTypeCustom];
[self.view addSubview:button1];
button1.frame = CGRectMake(40, 100, 80, 50);
button1.backgroundColor = [UIColor orangeColor];
[button1 addTarget:self action:@selector(buttonAction1:) forControlEvents:UIControlEventTouchUpInside ];
[button1 setTitle:@"post 同步" forState:UIControlStateNormal];
UIButton *button2 = [UIButton buttonWithType:UIButtonTypeCustom];
[self.view addSubview:button2];
button2.frame = CGRectMake(180, 40, 80, 50);
button2.backgroundColor = [UIColor greenColor];
[button2 addTarget:self action:@selector(buttonAction2:) forControlEvents:UIControlEventTouchUpInside ];
[button2 setTitle:@"get 异步" forState:UIControlStateNormal];
UIButton *button3 = [UIButton buttonWithType:UIButtonTypeCustom];
[self.view addSubview:button3];
button3.frame = CGRectMake(180, 100, 80, 50);
button3.backgroundColor = [UIColor greenColor];
[button3 addTarget:self action:@selector(buttonAction3:) forControlEvents:UIControlEventTouchUpInside ];
[button3 setTitle:@"post 异步" forState:UIControlStateNormal];
self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(40, 180, 200, 150)];
self.imageView.backgroundColor = [UIColor lightGrayColor];
[self.view addSubview:self.imageView];
}
1.GET同步请求
- (void)buttonAction:(UIButton *)button
{
NSLog(@"get 同步");
// 网络请求地址
NSString *urlStr = @"http://api.map.baidu.com/place/v2/search?query=银行®ion=大连&output=json&ak=6E823f587c95f0148c19993539b99295";
// 对中文进行编码(因为网址有中文 , 所以要进行中文转码)
NSString *urlStrEcode = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
// 1.创建URL地址
NSURL *url = [NSURL URLWithString:urlStrEcode];
// 2.创建请求对象
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
// 创建服务器响应信息对象
NSURLResponse *response = nil;
// 创建错误信息对象
NSError *error = nil;
// 3.向服务器发送请求
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
// 由于该网址请求下来的数据是字典,所以要用字典接收, 如果是数组,用数组接收, 字典或数组就是你要用的数据
NSMutableDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
NSLog(@"dic = %@", dic);
NSLog(@"response = %@ error = %@", response, error);
}
2.POST同步
- (void)buttonAction1:(UIButton *)button1
{
NSLog(@"post 同步");
NSString *str = @"http://mhjk.1391.com/comic/comicslist_v2";
NSURL *url = [NSURL URLWithString:str];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
// 设置请求方式为post
[request setHTTPMethod:@"POST"];
// 设置参数
NSString *bodyStr = @"subject=5&pagesize=21&pageno=1";
// 将参数转为data型
NSData *bodyData = [bodyStr dataUsingEncoding:NSUTF8StringEncoding];
// 设置请求对象body体
[request setHTTPBody:bodyData];
NSURLResponse *response = nil;
NSError *error = nil;
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
// NSLog(@"response = %@", response);
NSMutableDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
NSLog(@"dic = %@", dic);
}
- (void)buttonAction2:(UIButton *)button2
{
NSString *str = @"http://img4.duitang.com/uploads/item/201207/28/20120728105310_jvAjW.thumb.600_0.jpeg";
NSURL *url = [NSURL URLWithString:str];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
#pragma mark 设置异步请求代理
[NSURLConnection connectionWithRequest:request delegate:self];
}
#pragma mark -- 收到服务器响应
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
NSLog(@"response = %@", response);
// 初始化data属性
self.data = [NSMutableData data];
}
#pragma mark -- 接收数据
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
// 接收data对象
[self.data appendData:data];
}
#pragma mark -- 数据请求完成(数据请求解析可写在此方法里)
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSMutableArray *array = [NSJSONSerialization JSONObjectWithData:self.data options:0 error:nil];
NSLog(@"array %@", array);
}
#pragma mark -- 数据请求失败
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog(@"数据请求失败 %@", error);
}
4.POST异步(此方法最常用, GET请求也可以用)
- (void)buttonAction3:(UIButton *)button3
{
NSLog(@"post 异步");
NSString *str = @"http://mhjk.1391.com/comic/comicslist_v2";
NSURL *url = [NSURL URLWithString:str];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:@"POST"];
// 没有body体可不写
NSString *bodyStr1 = [NSString stringWithFormat:@"{\"subject\":\"%@\",\"pagesize\":\"%@\",\"pageno\":\"%@\"}", @"5", @"3", @"0"];
NSLog(@"%@", bodyStr1);
// 将body转为NSData类型
NSData *data = [bodyStr1 dataUsingEncoding:NSUTF8StringEncoding];
[request setHTTPBody:data];
// post 异步请求 block
// 参数1.request对象
// 参数2.多线程队列NSOperationQueue对象
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
#pragma mark -- 遇到block 一定是回调回来的参数就是你要的数据
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
NSLog(@"dic = %@", dic);
}];
}