有没有办法为 java.lang.StringBuilder 指定字符编码
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Is there a way to specify the character encoding to the java.lang.StringBuilder
提问by Mr_and_Mrs_D
Or am I stuck with :
或者我坚持：
String s = new String(new byte[0], Charset.forName("ISO-8859-1"));
// or ISO_8859_1, or LATIN-1 or ... still no constants for those
for (String string : strings) { // those are ISO-8959-1 encoded
s += string; // hopefully this preserves the encoding (?)
}
回答by Jon Skeet
Strings are alwaysUTF-16-encoded in Java. They're justsequences of charvalues, which are UTF-16 code units. When you specify the encoding to the String(byte[], String)constructor, it's justsaying how to decode the bytes into text - the encoding is discarded afterwards.
字符串在 Java中始终采用UTF-16 编码。它们只是char值的序列，它们是 UTF-16 代码单元。当您为String(byte[], String)构造函数指定编码时，它只是说明如何将字节解码为文本 - 之后会丢弃编码。
If you need to preserve an encoding, you'll need to create your own class to keep a Charsetand Stringtogether. I can't say that I've ever wanted to do that though - are you really sure you need to?
如果您需要保留编码，则需要创建自己的类来保持一个Charset和String在一起。我不能说我曾经想这样做 - 你真的确定你需要这样做吗？
(So your "stuck with" code wouldn't work anyway - and it would also be inefficient.)
（因此，您的“卡住”代码无论如何都不起作用-而且效率也很低。）
回答by gavenkoa
How about to use converter with caching:
如何使用带缓存的转换器：
public static void main(String args[]) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream(1<<10);
OutputStreamWriter osw = null;
try {
osw = new OutputStreamWriter(baos, "UTF-8");
} catch (UnsupportedEncodingException ex) {
}
osw.write("Привет!");
osw.flush();
System.out.println("Hello: " + baos.toString("UTF-8"));
}
