Java CharsetDecoder在每个字符后插入空格

Question

我正在尝试使用此代码(在 Stackoverflow 上找到)删除无效的 UTF-8 字符:

def text = file.text
CharsetDecoder utf8Decoder = Charset.forName("UTF-8").newDecoder();
utf8Decoder.onMalformedInput(CodingErrorAction.IGNORE);
utf8Decoder.onUnmappableCharacter(CodingErrorAction.IGNORE);
ByteBuffer bytes = ByteBuffer.allocate(text.getBytes().length * 2)
CharBuffer cbuf = bytes.asCharBuffer()
cbuf.put(text)
cbuf.flip()
CharBuffer parsed = utf8Decoder.decode(bytes);
println parsed.toString()

我得到的输出是这样的:

 < d o c u m e n t >
     < t i t l e > S o me  T i t l e   < / t i t l e >
     < s i t e > A S i t e < / s i t e >

对于为什么会这样表现有什么想法吗？

Answer 1

不知道为什么这不起作用，但这就是修复它的方法(代码在 Groovy 中，而不是 Java):

file.withInputStream { stream ->
    CharsetDecoder utf8Decoder = Charset.forName("UTF-8").newDecoder();
    utf8Decoder.onMalformedInput(CodingErrorAction.IGNORE);
    utf8Decoder.onUnmappableCharacter(CodingErrorAction.IGNORE);
    def reader = new BufferedReader(new InputStreamReader(stream, utf8Decoder))
    def line = null

    def sb = new StringBuilder()
    while ( (line = reader.readLine()) != null) {
        sb.append("$line\n")
    }
    reader.close()
}