在服务器上登录注册的实现

- (IBAction)loginPress:(id)sender {    NSString *name = self.nameField.text;    NSString *password = self.passwordField.text;    NSString* pathName=[[NSUserDefaults standardUserDefaults] objectForKey:@"NAME"];    if (![pathName isEqualToString:name]) {        [[NSUserDefaults standardUserDefaults]removeObjectForKey:@"NAME"];        [[NSUserDefaults standardUserDefaults]synchronize];    }    NSURL *url = [NSURL URLWithString:@"http://192.168.0.251:8080/service/userlogin"];    ASIFormDataRequest * request = [[ASIFormDataRequest alloc]initWithURL:url];    [request setPostValue:name forKey:@"user_name"];    [request setPostValue:password forKey:@"user_password"];    [request startSynchronous];    NSError *error = [request error];    if (!error) {        NSString *responeString = [request responseString];        NSLog(@"responseString = %@",responeString);        NSRange range = [responeString rangeOfString:@"<status>"];        NSString *str = [responeString substringWithRange:NSMakeRange(range.location+8, 1)];        NSLog(@"str = %@",str);        if ([str intValue] == 1) {//          登录成功后的跳转页面的实现方法            [self enterMainView];            [[NSUserDefaults standardUserDefaults] setObject:name forKey:@"NAME"];            [[NSUserDefaults standardUserDefaults]synchronize];            NSLog(@"login success");        }else {            NSRange startRange = [responeString rangeOfString:@"<message>"];            NSRange endRange = [responeString rangeOfString:@"</message>"];            NSString *errorMessage = [responeString substringWithRange:NSMakeRange(startRange.location+9, endRange.location-startRange.location-9)];            UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"登录失败" message:errorMessage delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];            [alert show];            [alert release];            return;        }    }else {        UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"登录失败" message:@"请检查你的网络连接" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];        [alertView show];        [alertView release];        return;    }}- (IBAction)resignPress:(id)sender {    if([self.nameField.text length]<6||[self.nameField.text length]>20){        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"警告" message:@"长度必须大于6小于20" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];        [alert show];        [alert release];    }else if ([self.passwordField.text length]<6||[self.passwordField.text length]>20) {        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"警告" message:@"长度必须大于6小于20" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];        [alert show];        [alert release];    }else {        NSURL *url = [NSURL URLWithString:@"http://192.168.0.251:8080/service/registerUser"];        ASIFormDataRequest *registerRequest = [[ASIFormDataRequest alloc]initWithURL:url];        [registerRequest setPostValue:self.nameField.text forKey:@"user_name"];        [registerRequest setPostValue:self.passwordField.text forKey:@"user_password"];        [registerRequest startSynchronous];        NSError *error = [registerRequest error];        if (!error) {            NSString *response = [registerRequest responseString];            NSRange range = [response rangeOfString:@"<status>"];            NSString *str = [response substringWithRange:NSMakeRange(range.location+8, 1)];            if ([str intValue] == 1) {                UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"注册成功" message:@"用户注册成功" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];                [alert show];                [self.passwordField resignFirstResponder];                [alert release];            }else{                NSRange startRange = [response rangeOfString:@"<message>"];                NSRange endRange = [response rangeOfString:@"</message>"];                NSString *errorMessage = [response substringWithRange:NSMakeRange(startRange.location+9, endRange.location-startRange.location-9)];                UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"错误信息" message:errorMessage delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];                [alert show];                [alert release];            }        }else {            UIAlertView* alert=[[UIAlertView alloc]initWithTitle:@"请求发生错误" message:@"Error" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];            [alert show];            [alert release];            return;        }    }}