java向txt文件中写入数据时换行  

FileOutputStream fos = new FileOutputStream(filePath);

/**txt中换行*/
  byte[] c = new byte[2];
  c[0]=0x0d;
  c[1]=0x0a;

String c_string = new String(c);

 for(int i=0; i<notFoundList.size(); i++){
   fos.write((notFoundList.get(i).toString()+c_string).getBytes());
  }
  if(fos != null){
   fos.close();
  }