Thank you for your reply. Unfortunately, I cannot know the encoding of the internal file. I hope to automatically recognize the encoding of the file when decompressing it. So I simply modified the source code. I checked the character set decoding again. isFileNameUTF8Encoded Is the judgment accurate? public static String decodeStringWithCharset(byte[] data, boolean isUtf8Encoded, Charset charset) { if (isUtf8Encoded || isUtf8(data)) { return new String(data, InternalZipConstants.CHARSET_UTF_8); } if (charset != null) { return new String(data, charset); } try { return new String(data, ZIP_STANDARD_CHARSET_NAME); } catch (UnsupportedEncodingException e) { return new String(data); } } private static boolean isUtf8(byte[] rawtext) { int score = 0; int i, rawtextlen = 0; int goodbytes = 0, asciibytes = 0; // Maybe also use UTF8 Byte Order Mark: EF BB BF // Check to see if characters fit into acceptable ranges rawtextlen = rawtext.length; for (i = 0; i < rawtextlen; i++) { if ((rawtext[i] & (byte) 0x7F) == rawtext[i]) { // 最高位是0的ASCII字符 asciibytes++; // Ignore ASCII, can throw off count } else if (-64 <= rawtext[i] && rawtext[i] <= -33 //-0x40~-0x21 && // Two bytes i + 1 < rawtextlen && -128 <= rawtext[i + 1] && rawtext[i + 1] <= -65) { goodbytes += 2; i++; } else if (-32 <= rawtext[i] && rawtext[i] <= -17 && // Three bytes i + 2 < rawtextlen && -128 <= rawtext[i + 1] && rawtext[i + 1] <= -65 && -128 <= rawtext[i + 2] && rawtext[i + 2] <= -65) { goodbytes += 3; i += 2; } } if (asciibytes == rawtextlen) { return false; } score = 100 * goodbytes / (rawtextlen - asciibytes); // If not above 98, reduce to zero to prevent coincidental matches // Allows for some (few) bad formed sequences if (score > 98) { return true; } else if (score > 95 && goodbytes > 30) { return true; } else { return false; } }

file name encoding problem #304

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