去掉UTF8 BOM格式，转换成UTF8格式
public static void utf8bom2Utf8(String dir) throws IOException{
File file = new File(dir);
if(file.isDirectory()){
File[] files = file.listFiles();
for (int i = 0; i < files.length; i++) {
utf8bom2Utf8(files[i].getAbsolutePath());
}
} else{
FileInputStream fis = new FileInputStream(file);
long size = fis.getChannel().size();
byte[] b = new byte[3];
fis.read(b, 0, 3);
String str = "";
for (byte c : b) {
str += Integer. toHexString(c&0xff);
}
if("efbbbf" .equals(str)){
System. out.println(file.getAbsolutePath());
byte[] newbytes = new byte[( int)size-3];
fis.read(newbytes,0,( int)size-3);
fis.close();
FileOutputStream fos = new FileOutputStream(file);
fos.write(newbytes);
fos.flush();
fos.close();
}
}
}
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