从String.getBytes（“UTF-8”）处理UnsupportedEncodingException的推荐方法 [英] Recommended method for handling UnsupportedEncodingException from String.getBytes("UTF-8")

问题描述

在调用时，处理 UnsupportedEncodingException 的建议方法是什么？ String.getBytes（UTF-8）里面的库方法？

What is the recommended way to handle an UnsupportedEncodingException when calling String.getBytes("UTF-8") inside a library method?

如果我正在阅读 http://docs.oracle.com/javase/6/docs/technotes/guides/intl/encoding.doc.html ，UTF-8编码应始终 这使我相信没有理由将此异常传递给库的消费者（即，在方法签名中添加一个 throws 子句）。似乎任何使UTF-8编码设施不可用的失败模式将是灾难性的，导致我写这个处理程序：

If I'm reading http://docs.oracle.com/javase/6/docs/technotes/guides/intl/encoding.doc.html correctly, UTF-8 encoding should always be available, which leads me to believe there's no reason to pass this exception on to the library's consumer (that is, add a throws clause to the method signature). It seems any failure mode that made UTF-8 encoding facilities unavailable would be catastrophic, leading me to write this handler:

    try
    {
        ....
        return "blah".getBytes("UTF-8");
    }
    catch (UnsupportedEncodingException e)
    {
        // we're assuming UTF-8 encoding is always available.
        // see
        // http://docs.oracle.com/javase/6/docs/technotes/guides/intl/encoding.doc.html
        e.printStackTrace();
        return null; //prevent compile-time "method must return a result" errors
    }

推荐答案

你知道我在做什么吗？

return "blah".getBytes( Charset.forName( "UTF-8" ) );

这不会引发检查异常。

更新：自Java 1.7开始，我们有 StandardCharsets 。

Update: Since Java 1.7, we have StandardCharsets.

return "blah".getBytes( StandardCharsets.UTF_8 );

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