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iOS使用NSURLConnection发送同步和异步HTTP Request

2024-08-04 20:42:29   219人阅读

 

1. 同步发送
 
- (NSString *)sendRequestSync
{
    // 初始化请求, 这里是变长的, 方便扩展
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
 
    // 设置
    [request setURL:[NSURL URLWithString:urlStr]];
    [request setHTTPMethod:@"POST"];
    [request setValue:host forHTTPHeaderField:@"Host"];
    NSString *contentLength = [NSString stringWithFormat:@"%d", [content length]];
    [request setValue:contentLength forHTTPHeaderField:@"Content-Length"];
    [request setHTTPBody:content];
 
    // 发送同步请求, data就是返回的数据
    NSError *error = nil;
    NSData *data = http://www.mamicode.com/[NSURLConnection sendSynchronousRequest:request returningResponse:nil error:&error];
    if (data =http://www.mamicode.com/= nil) {
        NSLog(@"send request failed: %@", error);
        return nil;
    }
 
    NSString *response = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    NSLog(@"response: %@", response);
    return response;
}
 
2.异步发送
 
1) 使用delegate的方式:
 
- (void)sendRequestAsync
{
    // 初始化请求
    NSMutableURLRequest  *request = [[NSMutableURLRequest alloc] init];
 
    // 设置
    [request setURL:[NSURL URLWithString:urlStr]];
    [request setCachePolicy:NSURLRequestUseProtocolCachePolicy]; // 设置缓存策略
    [request setTimeoutInterval:5.0]; // 设置超时
 
    //......
 
    receivedData = [[NSMutableData alloc] initData: nil];
 
    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request     delegate:self];
    if (connection == nil) {
        // 创建失败
        return;
    }
}
 
异步发送使用代理的方式, 需要实现以下delegate接口:
 
// 收到回应
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{    
    NSLog(@"receive the response");
    // 注意这里将NSURLResponse对象转换成NSHTTPURLResponse对象才能去
    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse*)response;
    if ([response respondsToSelector:@selector(allHeaderFields)]) {
        NSDictionary *dictionary = [httpResponse allHeaderFields];
        NSLog(@"allHeaderFields: %@",dictionary);
    }
    [receivedData setLength:0];
}    
 
// 接收数据   
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data    
{
    NSLog(@"get some data");
    [receivedData appendData:data];    
}
 
// 数据接收完毕
- (void)connectionDidFinishLoading:(NSURLConnection *)connection    
{
    NSString *results = [[NSString alloc]
                         initWithBytes:[receivedData bytes]
                         length:[receivedData length]
                         encoding:NSUTF8StringEncoding];
 
    NSLog(@"connectionDidFinishLoading: %@",results);
}
 
// 返回错误
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error    
{   
    NSLog(@"Connection failed: %@", error);        
}    
 
2) iOS 5.0版本新增异步发送接口:
+ (void)sendAsynchronousRequest:(NSURLRequest *)request
                          queue:(NSOperationQueue*) queue
              completionHandler:(void (^)(NSURLResponse*, NSData*, NSError*)) handlerNS_AVAILABLE(10_7, 5_0);
 

iOS使用NSURLConnection发送同步和异步HTTP Request


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