Loading a Java Charset manually(手动加载 Java 字符集)

本文介绍了手动加载 Java 字符集的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

I'm doing some work using the JavaMail API, and I've run across encodings which Java doesn't support natively (by design), such as UTF7/unicode-1-1-utf-7. For that encoding in particular I found the JUTF7 implementation of a Java Charset and CharsetProvider for UTF7. However, having added the jutf7.jar to my classpath I still get UnsupportedEncodingExceptions, and unicode-1-1-utf-7 is definitely one of JUTF7's aliases.

Is there a way to manually load the Charset or ensure that the Charset is being loaded so that I can rule that out as a cause?

解决方案

There's a bit more to using a new Charset, apart from putting the necessary classes into the classpath. To quote the Javadocs:

A charset provider identifies itself with a provider-configuration file named java.nio.charset.spi.CharsetProvider in the resource directory META-INF/services. The file should contain a list of fully-qualified concrete charset-provider class names, one per line. [...]

( http://download.oracle.com/javase/6/docs/api/java/nio/charset/spi/CharsetProvider.html )

Is this special file present in the JAR?

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