Created
January 16, 2014 05:59
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获取文本文件编码格式
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public String GetCharset(File file) { | |
String charset = "GBK"; | |
byte[] first3Bytes = new byte[3]; | |
try { | |
boolean checked = false; | |
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file)); | |
bis.mark(0); | |
int read = bis.read(first3Bytes, 0, 3); | |
if (read == -1) | |
return charset; | |
if (first3Bytes[0] == (byte) 0xFF && first3Bytes[1] == (byte) 0xFE) { | |
charset = "UTF-16LE"; | |
checked = true; | |
} else if (first3Bytes[0] == (byte) 0xFE && first3Bytes[1] == (byte) 0xFF) { | |
charset = "UTF-16BE"; | |
checked = true; | |
} else if (first3Bytes[0] == (byte) 0xEF && first3Bytes[1] == (byte) 0xBB && first3Bytes[2] == (byte) 0xBF) { | |
charset = "UTF-8"; | |
checked = true; | |
} | |
// bis.reset(); | |
if (!checked) { | |
while ((read = bis.read()) != -1) { | |
if (read >= 0xF0) | |
break; | |
if (0x80 <= read && read <= 0xBF) | |
break; | |
if (0xC0 <= read && read <= 0xDF) { | |
read = bis.read(); | |
if (0x80 <= read && read <= 0xBF) | |
continue; | |
else | |
break; | |
} else if (0xE0 <= read && read <= 0xEF) { | |
read = bis.read(); | |
if (0x80 <= read && read <= 0xBF) { | |
read = bis.read(); | |
if (0x80 <= read && read <= 0xBF) { | |
charset = "UTF-8"; | |
break; | |
} else | |
break; | |
} else | |
break; | |
} | |
} | |
} | |
bis.close(); | |
} catch (Exception e) { | |
e.printStackTrace(); | |
} | |
return charset; | |
} |
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