Objective-c 模拟http请求

这个是b比较成套的网络请求方法，网站：http://allseeing-i.com/ASIHTTPRequest/How-to-use
如果用postfa方法提交则，
NSURL*url = [NSURLURLWithString:@"http://192.168.0.120:8888/web/Login.php"];
ASIFormDataRequest*request = [ASIFormDataRequestrequestWithURL:url];
//ASIFormDataRequest *request = [[[ASIFormDataRequest alloc] initWithURL:url] autorelease];
[requestsetPostValue:@"userName"forKey:@"userName"];
[requestsetPostValue:@"password"forKey:@"password"];
//[request setDelegate:self];
[requeststartSynchronous];
NSError*error = [requesterror];
if(!error) {
NSString*response = [requestresponseString];
NSLog(@"response = %@",response);
}

get方法：
NSURL *url = [NSURL URLWithString:@"http://allseeing-i.com"];
  ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
  [request startSynchronous];
  NSError *error = [request error];
  if (!error) {
    NSString *response = [request responseString];
  }

或者试用NSMutableURLRequest:
NSString *myRequestString = @"&userName=baowu&password=123456"; 
 NSData *myRequestData = [ NSData dataWithBytes: [ myRequestString UTF8String ] length: [ myRequestString length ] ];
 NSMutableURLRequest *request = [ [ NSMutableURLRequest alloc ] initWithURL: [ NSURL URLWithString: @"http://192.168.0.120:8888/web/Login.php"]];
 [ request setHTTPMethod: @"POST" ]; 
 [ request setHTTPBody: myRequestData ]; 
 NSData *returnData = [ NSURLConnection sendSynchronousRequest: request returningResponse: nil error: nil ]; 
 NSString* aStr = [[NSString alloc] initWithData:returnData encoding:NSASCIIStringEncoding];
 NSLog(@"aStr = %@",aStr);