发送带有特殊字符 iOS 的 POST 请求

Question

我的应用调用 Web 服务进行登录。通常该服务可以正常工作，但是当我的密码带有特殊字符（例如：!*'\"();:@&=+$,/?%#[]%）时，Web 服务器不会'不允许我登录，因为在服务器端我收到的密码没有特殊字符，例如：

在我的应用上插入密码：test+test

密码接收到网络服务器：testtest

正如您看到的删除特殊字符的请求，实际上我正在使用以下代码发送登录凭据：

- (id)sendRequestToURL:(NSString *)url withMethod:(NSString *)method withUsername:(NSString*)username withPassword:(NSString*)password andInstallationId:(NSString*)installationId {
    NSURL *finalURL = [[NSURL alloc]init];

    if ([method isEqualToString:@"POST"]) {
        finalURL = [NSURL URLWithString:url];
    } else {
        NSLog(@"Metodo no previsto");
    }

    NSString *post = [NSString stringWithFormat:@"username=%@&password=%@&installationId=%@", username, password, installationId];
    NSData *postData = [post dataUsingEncoding:NSUTF8StringEncoding];

    NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)postData.length];

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc]init];
    [request setURL:finalURL];
    [request setHTTPMethod:method];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
    [request setHTTPBody:postData];

    NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate:self];
    if (connection) {
        [connection start];
    }

    return connection;
}

我该如何解决这个问题？我看了NSString class reference，看到有- stringByAddingPercentEncodingWithAllowedCharacters:不删除特殊字符的方法，有人知道这个方法怎么用吗？可以给我一个代码 sn-p 吗？

谢谢

Answer 1

我找到了解决这个问题的方法，下面是我的代码，也许它应该对某人有用：

- (id)sendRequestToURL:(NSString *)url withMethod:(NSString *)method withUsername:(NSString*)username withPassword:(NSString*)password andInstallationId:(NSString*)installationId {
    NSURL *finalURL = [[NSURL alloc]init];

    if ([method isEqualToString:@"POST"]) {
        finalURL = [NSURL URLWithString:url];
    } else {
        NSLog(@"Metodo no previsto");
    }

    NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLKMNOPQRSTUVWXYZ0123456789"];

    NSString *encodedPassword = [password stringByAddingPercentEncodingWithAllowedCharacters:set];

    NSString *post = [NSString stringWithFormat:@"username=%@&password=%@&installationId=%@", username, encodedPassword, installationId];

    NSData *postData = [post dataUsingEncoding:NSUTF8StringEncoding];

    NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)postData.length];

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc]init];
    [request setURL:finalURL];
    [request setHTTPMethod:method];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
    [request setHTTPBody:postData];

    NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate:self];
    if (connection) {
        [connection start];
    }

    return connection;
}

通过这种方式，我在密码字符串中搜索特殊字符，如果找到，则使用百分比编码更改此字符。这样，我可以使用普通密码和带有特殊字符的密码登录。我希望它对某人有用。

Answer 2

只需使用- stringByAddingPercentEscapesUsingEncoding: 对每个参数进行编码。

NSString *encodeUsername = [username stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSString *encodePassword = [password stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSString *encodeInstallationId = [installationId stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

NSString *post = [NSString stringWithFormat:@"username=%@&password=%@&installationId=%@", encodeUsername, encodePassword, ins encodeInstallationId allationId];

并在您的请求中使用此编码参数。

Answer 3

Url 编码您的字符串并 POST 到 Web 服务。请使用下面的方法进行 url 编码。

+(NSString *) urlencode: (NSString *) str {
NSString * encodedString = (NSString *)CFURLCreateStringByAddingPercentEscapes(
                                                                               NULL,
                                                                               (CFStringRef)str,
                                                                               NULL,
                                                                               (CFStringRef)@" ",
                                                                               kCFStringEncodingUTF8 );

return [encodedString autorelease];

}