去除bom方法

public static void trimBom(String fileName) throws IOException {FileInputStream fin = new FileInputStream(fileName);// 开始写临时文件InputStream in = fin;ByteArrayOutputStream bos = new ByteArrayOutputStream();byte b[] = new byte[4096];int len = 0;while (in.available() > 0) {len = in.read(b, 0, 4096);// out.write(b, 0, len);bos.write(b, 0, len);}in.close();fin.close();bos.close();// 临时文件写完，开始将临时文件写回本文件。FileOutputStream out = new FileOutputStream(fileName);out.write(bos.toByteArray());out.close();}

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