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Java Forum / First Aid / January 2006obtaining list of available encodings
I would like to obtain a list of the available encodings at runtime. java.nio provides the java.nio.charset.Charset.availableCharsets method for doing this, but as far as I can tell there is no comparable method for java.io, and using the java.nio method won't help since java.io provides encodings that are not available in java.nio. The only way I can see to do this is the error-prone and ineffecient technique of trying a long list of encodings and using the exceptions to determine which ones are not available. Is there a simple way to obtain a list of the encodings available in java.io at runtime? Thanks. > ... java.nio provides the > java.nio.charset.Charset.availableCharsets method for > doing this, but as far as I can tell there is no > comparable method for java.io, and > using the java.nio > method won't help since java.io provides encodings > that are not available in java.nio. I was under the impression that, under the hood, java uses java.nio for all its charset needs. "I was under the impression that, under the hood, java uses java.nio for all its charset needs. " Indeed this is what some sources would lead one to believe, but it isn't true. For instance, I successfully created an InputStreamReader using the encoding CP918. If in the same program I evaluate java.nio.charset.Charset.isSupported() for this encoding, it returns false. This behavior is consistent with the information on this web page:http://java.sun.com/j2se/1.3/docs/guide/intl/encoding.doc.html, according to which java.io and java.nio support different sets of encodings. Roughly speaking, java.nio supports the various national and international standards, while java.io adds various Microsoft and IBM codepages. >Roughly speaking, java.nio supports the various national and >international standards, while java.io adds various Microsoft and IBM >codepages. Is the code that implements them radically different?  SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. > "I was under the impression that, under the hood, > java uses java.nio for all its charset needs. " [quoted text clipped - 5 lines] > false. This behavior is consistent with the information on this web > page:http://java.sun.com/j2se/1.3/docs/guide/intl/encoding.doc.html Well, no surprise, as Java 1.3 predates the java.nio package. The 1.4.2 and 1.5 equivalent URLs exist and suggest that the java.nio, java.io and java.lang APIs support the same encoding sets. >I would like to obtain a list of the >available encodings at runtime. java.nio provides the [quoted text clipped - 8 lines] >to obtain a list of the encodings available in java.io >at runtime? Thanks. Have a look at my list. See http://mindprod.com/jgloss/encoding.html I gleaned them by scanning class file and other cheating. SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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