Where to get “UTF-8” string literal in Java?

Question

I\'m trying to use a constant instead of a string literal in this piece of code:

new InputStreamReader(new FileInputStream(file), \"UTF-8\")

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Answer 1

In case this page comes up in someones web search, as of Java 1.7 you can now use java.nio.charset.StandardCharsets to get access to constant definitions of standard charsets.

Answer 2

There are none (at least in the standard Java library). Character sets vary from platform to platform so there isn't a standard list of them in Java.

There are some 3rd party libraries which contain these constants though. One of these is Guava (Google core libraries): http://guava-libraries.googlecode.com/svn/trunk/javadoc/com/google/common/base/Charsets.html

Answer 3

This constant is available (among others as: UTF-16, US-ASCII, etc.) in the class org.apache.commons.codec.CharEncoding as well.

Answer 4

Now I use org.apache.commons.lang3.CharEncoding.UTF_8 constant from commons-lang.

Answer 5

In Java 1.7+

Do not use "UTF-8" string, instead use Charset type parameter:

import java.nio.charset.StandardCharsets

...

new InputStreamReader(new FileInputStream(file), StandardCharsets.UTF_8);