[Cocoa]iOS中的url编码问题
iOS中的url编码问题
罗朝辉 (http://www.cnblogs.com/kesalin/)
本文遵循“署名-非商业用途-保持一致”创作公用协议
NSString 的 stringByAddingPercentEscapesUsingEncoding 可以对 url 参数进行编码,但是有点小问题,不会对所有需要编码的字符都编码。我们可以通过 CFStringRef 的
CFURLCreateStringByAddingPercentEscapes 函数来封装这个功能。代码如下:
- (NSString *)encodeToPercentEscapeString: (NSString *) input
{
// Encode all the reserved characters, per RFC 3986
// (<http://www.ietf.org/rfc/rfc3986.txt>)
NSString *outputStr = (NSString *)
CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
(CFStringRef)input,
NULL,
(CFStringRef)@"!*'();:@&=+$,/?%#[]",
kCFStringEncodingUTF8);
return outputStr;
}
- (NSString *)decodeFromPercentEscapeString: (NSString *) input
{
NSMutableString *outputStr = [NSMutableString stringWithString:input];
[outputStr replaceOccurrencesOfString:@"+"
withString:@" "
options:NSLiteralSearch
range:NSMakeRange(0, [outputStr length])];
return [outputStr stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
}
测试代码:
NSString * testUrl = @"http://search.google.com?keywords=($# it's {a*123})00!*'();:@&=+$,/?%#[]";
NSLog(@"original: %@", testUrl);
NSString * encodeStr = [self encodeToPercentEscapeString:testUrl];
NSLog(@"encoded: %@", encodeStr);
NSString * encodeStr2 = [testUrl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog(@"encoded2:%@", encodeStr2);
NSString * decodeStr = [self decodeFromPercentEscapeString:encodeStr];
NSLog(@"decoded: %@", decodeStr);
结果如下:
>> original: http://search.google.com?keywords=($# it's {a*123})00!*'();:@&=+$,/?%#[]
>> encoded: http%3A%2F%2Fsearch.google.com%3Fkeywords%3D%28%24%23%20it%27s%20%7Ba%2A123%7D%2900%21%2A%27%28%29%3B%3A%40%26%3D%2B%24%2C%2F%3F%25%23%5B%5D
>> encoded2: http://search.google.com?keywords=($%23%20it's%20%7Ba*123%7D)00!*'();:@&=+$,/?%25%23%5B%5D
>> decoded: http://search.google.com?keywords=($# it's {a*123})00!*'();:@&=+$,/?%#[]