包含正斜杠/和HTML的字符串的NSJSONSerialization序列化未正确转义 [英] NSJSONSerialization serialization of a string containing forward slashes / and HTML is escaped incorrectly
问题描述
我正在尝试将一些简单的HTML转换为JSON对象中的字符串值，但我无法使字符串编码无法转义NSJSONSerialization中的字符串。
I am trying to convert some simple HTML into a string value in a JSON object and I'm having trouble getting the string encoding to not escape the string in NSJSONSerialization.
示例...我有一个包含一些基本HTML文本的字符串：
Example... I have a string which contains some basic HTML text:
NSString *str = @"<html><body><p>Samples / Text</p></body></html>";
所需的结果是JSON，其中包含HTML值：
The desired outcome is JSON with HTML as the value:
{
"Title":"My Title",
"Instructions":"<html><body><p>Samples / Text</p></body></html>"
}
我正在使用标准技术将NSDictionary转换为包含JSON的NSString ：
I'm using the standard technique to convert an NSDictionary to a NSString containing JSON:
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
[dict setObject:str forKey:@"Instructions"];
[dict setObject:@"My Title" forKey:@"Title"];
NSError *err;
NSData *data = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:&err];
NSString *resultingString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"%@", resultingString);
此方法生成的JSON有效，但HTML包含所有正斜杠转义：
The JSON produced by this method is valid, however the HTML has all forward slashes escaped:
{
"Title":"My Title",
"Instructions":"<html><body><p>Samples \/ Text<\/p><\/body><\/html>"
}
这会在指令JSON字符串中创建无效的HTML。
This creates invalid HTML in the instructions JSON string.
我想坚持使用NSJSONSerialization，因为我们在框架中的其他地方都使用它，并且在切换到非Apple库之前我已经被烧毁了，因为它们得不到支持。我尝试了很多不同的字符串编码，并且所有字符串编码都逃脱了尖括号。
I'd like to stick with NSJSONSerialization since we're using that everywhere else in our framework and I've been burned before switching to non-Apple libraries as they get desupported. I've tried many different string encodings and all of them escape the angle brackets.
显然\ /是JavaScript中/字符的有效表示，这就是为什么正斜杠被转义（即使StackOverflow文本编辑器也将其转义）。请参阅：
使用正斜杠转义json字符串？
以及 JSON：为什么正斜杠被转义？。我只是不希望它这样做，并且似乎没有办法阻止iOS在序列化时转义字符串值中的正斜杠。
Apparently \/ is a valid representation in JavaScript for the / characters, which is why forward slash is escaped (even the StackOverflow text editor escaped it). See: escaping json string with a forward slash? and also JSON: why are forward slashes escaped?. I just don't want it to do that and there doesn't seem to be a way to stop iOS from escaping forward slashes in string values when serializing.
推荐答案
我相信 NSJSONSerialization 的行为与HTML编码一样。
I believeNSJSONSerialization is behaving as designed in regards to encoding HTML.
如果你看一些问题（ 1 ， 2 ）在JSON编码HTML时你会看到答案总是提到转义正斜杠。
If you look at some questions (1, 2) on encoding HTML in JSON you'll see the answers always mention escaping the forward slashes.
JSON 不需要转发斜杠，但HTML不允许使用javascript字符串< / 因为它可能与< SCRIPT> 标记的结尾混淆。
JSON doesn't require forward slashes to be escaped, but HTML doesn't allow a javascript string to contain </ as it can be confused with the end of the <SCRIPT> tag.
查看答案此处，这里，最直接的是 w3.org HTML4附录，载于 B.3.2指定非HTML数据
See the answers here, here and most directly the w3.org HTML4 Appendix which states in B.3.2 Specifying non-HTML data
ILLEGAL EXAMPLE:
The following script data incorrectly contains a "</" sequence (as part of "</EM>") before the SCRIPT end tag:
<SCRIPT type="text/javascript">
document.write ("<EM>This won't work</EM>")
</SCRIPT>
虽然此行为可能会导致您的问题 NSJSONSerialisation 只是按照古老的HTML数据编码规则进行播放，以便在< SCRIPT> 标签中使用。
Although this behaviour may cause issues for you NSJSONSerialisation is just playing by the age old rules of encoding HTML data for use in <SCRIPT> tags.
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