通过NSURLConnection发送一个HTTP GET请求

//send a GET request to server with some params-(void)httpGetWithParams{    NSString *urlString = @"http://chaoyuan.sinaapp.com";    urlString = [urlString stringByAppendingString:@"?p=1059"];    NSURL *url = [NSURL URLWithString:urlString];    NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];    [urlRequest setTimeoutInterval:30.0f];    [urlRequest setHTTPMethod:@"GET"];    NSOperationQueue *queue = [[NSOperationQueue alloc] init];    [NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {        if ([data length] > 0 && connectionError == nil) {            NSString *html = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];            NSLog(@"HTML = %@",html);        }else if([data length] == 0 && connectionError == nil){            NSLog(@"nothing was download.");        }else if(connectionError != nil){            NSLog(@"Error happened = %@",connectionError);        }    }];}

通过NSURLConnection发送一个HTTP POST请求

//send a POST request to a server with some params-(void)httpPostWithParams{    NSString *urlAsString = @"http://chaoyuan.sinaapp.com";    urlAsString = [urlAsString stringByAppendingString:@"?param1=First"];    urlAsString = [urlAsString stringByAppendingString:@"¶m2=Second"];    NSURL *url = [NSURL URLWithString:urlAsString];    NSString *body = @"bodyParam1=BodyValue1&bodyParam2=BodyValue2";    NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];    [urlRequest setTimeoutInterval:30.0f];    [urlRequest setHTTPMethod:@"POST"];    [urlRequest setHTTPBody:[body dataUsingEncoding:NSUTF8StringEncoding]];    [urlRequest setValue:[NSString stringWithFormat:@"%lu", (unsigned long)[body length]] forHTTPHeaderField:@"Content-Length"];    [urlRequest setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];    NSOperationQueue *queue = [[NSOperationQueue alloc] init];    [NSURLConnection     sendAsynchronousRequest:urlRequest     queue:queue completionHandler:^(NSURLResponse *response, NSData *data,                                     NSError *error) {         if ([data length] >0 &&             error == nil){             NSString *html = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; NSLog(@"HTML = %@", html);             // 显示到UIWebView             //[self.bankWebView loadData:data MIMEType:@"text/html" textEncodingName:@"UTF-8" baseURL:nil];         }         else if ([data length] == 0 &&                  error == nil){             NSLog(@"Nothing was downloaded.");         }         else if (error != nil){             NSLog(@"Error happened = %@", error);         }     }];}