io流 java 添加bom头 文件前面添加内容

try {

FileInputStream fis = new FileInputStream("input.csv");

InputStreamReader isr = new InputStreamReader(fis, "UTF-8");

BufferedReader br = new BufferedReader(isr);

FileOutputStream fos = new FileOutputStream("output.csv");

fos.write(new byte[]{(byte)0xEF, (byte)0xBB, (byte)0xBF});

OutputStreamWriter osw = new OutputStreamWriter(fos, "UTF-8");

BufferedWriter bw = new BufferedWriter(osw);

String line = null;

while((line = br.readLine()) != null) {

bw.write(line);

bw.newLine();

}

bw.close();

br.close();

} catch (IOException e) {

e.printStackTrace();

}