When will java.net.URLEncoder.encode function throw UnsupportedEncodingException? [duplicate]

Question

If I were to encode a string using the encode method of the URLEncoder class, when will it throw the UnsupportedEncodingException?

String encodedString = URLEncoder.encode(myString, "UTF-8");

I have read the documentation which reads,

Throws: UnsupportedEncodingException - If the named encoding is not supported

So, will this ever happen to my code if I always use "UTF-8"?

Well, thats what I want to know. Will it get thrown if I give any specific value to the string? — Halley
– Halley, Commented Jan 27, 2018 at 6:39
It won't happen if you use any of the standard encodings. It's just there in case you specify "XYZ". — user207421
– user207421, Commented Jan 27, 2018 at 6:44
There are no 'unencodable' strings, if a character does not exist in the target character set, it is replaced with either a ? or the unicode replacement character � (or U+FFFD). — Mark Rotteveel
– Mark Rotteveel, Commented Jan 28, 2018 at 12:31

Honza · Accepted Answer · 2018-01-27 06:40:43Z

2

You should be fine with UTF-8, it depends on JVM installed on computer, where final application will run. Anyhow UTF-8 is now supported by java.

You can use static constants in StandardCharsets class:

URLEncoder.encode("Your string", StandardCharsets.UTF_8.toString());

answered Jan 27, 2018 at 6:40

Honza

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2 Comments

Halley Over a year ago

Lets say, with the latest JVM. Java(TM) SE Runtime Environment (build 1.8.0_151-b12) :)

Honza Over a year ago

As far as you use StandardCharsets constants you are covered. Exception is thrown when you use different encodings. With UTF-8. You can check it here in doc link

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