编码＆＃34;＆amp;＆＃34;在URL中

Question

我必须向我的iPhone应用程序中的Web服务发送https GET请求，该应用程序是在Swift 1.2中开发的。

我正在尝试构造查询字符串参数，但在发送到服务器之前必须对它们进行编码。

密码包含＆＃39;＆amp;＆＃39;字符内。期待编码＆＃39;＆amp;＆＃39;字符到＆＃39;％26＆＃39;但不工作......

刚刚进行了一次测试＆＃39;％＆＃39;。按预期工作＆＃39;％＆＃39;提供＆＃39;％25＆＃39;。但不能转换＆＃39;＆amp;＆＃39;签....

尝试以下方式：

var testPassword1: String = "mypassword&1"

var testPassword2: String = "mypassword%1"


// Try to encode 'testPassword1'
testPassword1.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)! 
testPassword1.stringByAddingPercentEncodingWithAllowedCharacters(.URLHostAllowedCharacterSet())!


// Try to encode 'testPassword2'
testPassword2.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)!
testPassword2.stringByAddingPercentEncodingWithAllowedCharacters(.URLHostAllowedCharacterSet())!

我已完成上述测试，以下是回复

想知道这样做的正确方法。感谢。

Answer 1

您应该使用NSURLComponents完成任务。

给定一个URL字符串，创建一个url-components：

let urlString = "http://example.com"
let urlComponents = NSURLComponents(string: urlString)!

给定一个查询参数容器（可能是一个字典，或一个（String，String？）元组的数组），创建一个NSURLQueryItems数组：

let queryParameters: [String: String?] = ["param": "az09-._~!$&'()*+,;=:@/?", "reserved": ":/?#[]@!$&'()*+,;="]
var queryItems = queryParameters.map { NSURLQueryItem(name: $0.0, value: $0.1) }

将查询组件附加到url-components：

urlComponents.queryItems = queryItems.count > 0 ? queryItems : nil

print(urlComponents.string!)

打印：

http://example.com?reserved=:/?%23%5B%5D@!$%26'()*+,;%3D&param=az09-._~!$%26'()*+,;%3D:@/?

Answer 2

我使用这样的实用工具方法在GET请求中对值进行URL编码：

@interface NSString (Ext)

@property (nonatomic, readonly) NSString *urlEncoded;

@end

@implementation NSString (Ext)

- (NSString *)urlEncoded {
    NSMutableCharacterSet *const allowedCharacterSet = [NSCharacterSet URLQueryAllowedCharacterSet].mutableCopy;
    // See https://en.wikipedia.org/wiki/Percent-encoding
    [allowedCharacterSet removeCharactersInString:@"!*'();:@&=+$,/?#[]"]; // RFC 3986 section 2.2 Reserved Characters (January 2005)
    NSString *const urlEncoded = [self stringByAddingPercentEncodingWithAllowedCharacters:allowedCharacterSet];
    return urlEncoded;
}

@end

Answer 3

如果您需要编码＆amp;字符，您可以使用以下内容：

var testPassword1: String = "mypassword&1"
testPassword1.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)!
testPassword1.stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet(charactersInString: "&").invertedSet)!