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      UTF-8  appears in the code rather often  and would be much better to refer to some static final variable instead  Do you know where I can find such a variable in JDK   BTW  on a second thought  such constants are bad design  Public Static Literals     Are Not a Solution for Data Duplication

User · Answer

You can use Charset defaultCharset   API or file encoding property   But if you want your own constant  you ll need to define it yourself

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If you are using OkHttp for Java Android you can use the following constant   import com squareup okhttp internal Util   Util UTF 8     Charset Util UTF 8 name       String

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Class org apache commons lang3 CharEncoding UTF 8 is deprecated after Java 7 introduced java nio charset StandardCharsets    see JRE character encoding names  since 2 1  deprecated Java 7 introduced   link java nio charset StandardCharsets   which defines these constants as   link Charset  objects  Use   link Charset name    to get the string values provided in this class  This class will be removed in a future release

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Constant definitions for the standard  These   charsets are guaranteed to be available on every implementation of the Java   platform   since 1 7      package java nio charset   Charset utf8   StandardCharsets UTF 8

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

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The Google Guava library  which I d highly recommend anyway  if you re doing work in Java  has a Charsets class with static fields like Charsets UTF 8  Charsets UTF 16  etc   Since Java 7 you should just use java nio charset StandardCharsets instead for comparable constants   Note that these constants aren t strings  they re actual Charset instances  All standard APIs that take a charset name also have an overload that take a Charset object which you should use instead

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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

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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

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Now I use org apache commons lang3 CharEncoding UTF 8 constant from commons-lang

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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

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In Java 1 7   java nio charset StandardCharsets defines constants for Charset including UTF 8   import java nio charset StandardCharsets        StandardCharsets UTF 8 name      For Android  minSdk 19

[java] Where to get "UTF-8" string literal in Java?

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