iOS下URL编码

使用NSString默认的URL编码,会对汉字等进行转义,但是对=+等这些字符不会进行转义

所以要手动实现这些字符的转义

 

- (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

>> 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=($# it's {a*123})00!*'();:@&=+$,/?%#[] 

 

 

转自:http://blog.csdn.net/kesalin/article/details/6678939