//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] >  && connectionError == nil) {

            NSString *html = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

            NSLog(@"HTML = %@",html);

        }else if([data length] ==  && connectionError == nil){

            NSLog(@"nothing was download.");

        }else if(connectionError != nil){

            NSLog(@"Error happened = %@",connectionError);

        }

    }];

}

//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] > &&

             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] ==  &&

                  error == nil){

             NSLog(@"Nothing was downloaded.");

         }

         else if (error != nil){

             NSLog(@"Error happened = %@", error);

         }

     }];

}