iOS 开发笔记-NSURLConnection的使用

//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);
}
}];
}

//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);
}
}];
}