IOS請求WEB應用的方法

NSString  *urlString = @"http://127.0.0.1:8081/register";
   NSString *post = [NSString stringWithFormat: @"productId=80&userName=%@&password=%@&email=%@",username.text,mustr,email.text];
   NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:urlString]];
   NSData *postData = [post dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
   NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];
   NSLog(@"%@",[request description]);
   [request setHTTPMethod:@"POST"];
   [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
   [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
   [request setHTTPBody:postData];
   NSURLResponse *reponse;
   NSError *error = nil;
   NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&reponse error:&error];
   if (error != nil) {
       NSLog(@"Something wrong: %@",[error description]);
       [Utils alertWithTitle: @"" message: @"註冊失敗，請檢查您的網絡"];
   }else {
       if (responseData) {
           NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
           NSData *data = [responseString dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
           //設置該類本身爲代理類，即該類在聲明時要實現NSXMLParserDelegate委託協議
           NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data];
           [parser setDelegate:self];
           [parser parse];
           NSString *result = [self.xmlDict objectForKey:@"result"];
           NSString *code = [self.xmlDict objectForKey:@"code"];
           if([result isEqualToString:@"1"]){
               [Utils alertWithTitle: @"註冊成功" message: @"並且自動登錄"];
               UserUtil *uu = userUtil;
               uu.username = username.text;
               uu.password = password.text;
               uu.isLogin = YES;
               [self dismissView];
           }
           if([code isEqualToString:@"2003"]){
               [Utils alertWithTitle: @"註冊失敗" message: @"用戶名已經被其他用戶所使用"];
           }else if([code isEqualToString:@"2004"]){
               [Utils alertWithTitle: @"註冊失敗" message: @"未知錯誤"];
           }
           self.xmlDict = nil;
           [responseString release];
           responseString = nil;
           [parser release];
           parser = nil;
       }
   }

http://blog.csdn.net/ios_che/article/details/7325548