public static 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) {                 int loc = 0;                 while ((read = bis.read()) != -1) {                     loc++;                     if (read >= 0xF0)                         break;                     //单独出现BF以下的，也算是GBK                     if (0x80 <= read && read <= 0xBF)                         break;                     if (0xC0 <= read && read <= 0xDF) {                         read = bis.read();                         if (0x80 <= read && read <= 0xBF)// 双字节 (0xC0 - 0xDF)                             // (0x80 -                             // 0xBF),也可能在GB编码内                             continue;                         else                             break;                      // 也有可能出错，但是几率较小                     } 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;                     }                 }                 System.out.println(loc + " " + Integer.toHexString(read));             }             bis.close();         } catch (Exception e) {             e.printStackTrace();         }         return charset;     }