Post同步异步

//以下使用post

网址与数据分隔开

#define kNewsListURL @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx"
#define kNewsListParam @"date=20131129&startRecord=1&len=30&udid=1234567890&terminalType=Iphone&cid=213"

//代理方法所需要的协议

@interfacePostViewController ()<NSURLConnectionDelegate,NSURLConnectionDataDelegate>

//声明一个链接属性  方便在dealloc中使用

@property (nonatomic ,retain)NSURLConnection *connection;

//声明一个可变data 用于存放数据

@property (nonatomic ,retain)NSMutableData *receiveData;

- (void)dealloc
{
    [_connectioncancel];
    [_connectionrelease];
    [_receiveDatarelease];
    [superdealloc];
}

-----------------------------------------------------------------------

//Post同步

// 1.创建网址对象(没中文就不必转编码)
    NSURL *url = [NSURL URLWithString:kNewsListURL];
   
    // 2.利用网址对象 创建请求
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:(NSURLRequestUseProtocolCachePolicy)timeoutInterval:10];
   
    //设置标识
    [request setHTTPMethod:@"Post"];
   
    //把字符串转化成data使用UTF-8的编码格式(携带的请求体)
    NSData *data = [kNewsListParam dataUsingEncoding:NSUTF8StringEncoding];
   
    //注意区别: post请求可以携带一个请求体
    [request setHTTPBody:data];
   
    //创建同步链接
    NSData *newData = [NSURLConnection sendSynchronousRequest:request
returningResponse:nilerror:nil];
   
    //解析数据
    NSMutableDictionary *dataDic = [NSJSONSerializationJSONObjectWithData:newData options:(NSJSONReadingMutableContainers)error:nil];

    NSLog(@"%@",dataDic);

-----------------------------------------------------------------------

Post异步请求

 //获取网址对象
    NSURL *url = [NSURL URLWithString:kNewsListURL];
    //利用网址对象创建一个请求
    NSMutableURLRequest *request = [NSMutableURLRequestrequestWithURL:urlcachePolicy:(NSURLRequestUseProtocolCachePolicy)timeoutInterval:10];
    //创建标识
    //注意:post请求需要添加标识符
    [request setHTTPMethod:@"post"];
   
    //给这个请求添加请求体
    NSData *data = [kNewsListParamdataUsingEncoding:NSUTF8StringEncoding];
    [request setHTTPBody:data];
    //利用请求创建一个链接 (异步代理方法)

-----------------------------------------------------------------------

#pragma mark -- block方法
    [NSURLConnectionsendAsynchronousRequest:requestqueue:[NSOperationQueuemainQueue]completionHandler:^(NSURLResponse * _Nullable response,NSData *_Nullable data,NSError *_Nullable connectionError) {
       

    }];   

-----------------------------------------------------------------------

   self.connection = [NSURLConnectionconnectionWithRequest:requestdelegate:self];

    [self.connectionstart];

-----------------------------------------------------------------------

#pragma mark --代理方法
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    //链接成功时创建data
    self.receiveData = [NSMutableData data];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    //拼接data
    [self.receiveData appendData:data];
}


- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    //解析数据
    NSMutableDictionary *dataDic = [NSJSONSerializationJSONObjectWithData:self.receiveData options:(NSJSONReadingMutableContainers) error:nil];
    NSLog(@"%@",dataDic);

}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
   

}

UI第十六天 16-NSURLRequest