public String uploadBook(MultipartFile file, Book book, HttpServletRequest request) {

try{

String lineTxt = null;

String content="";

List titlelist=new ArrayList();

InputStream inputStream = null;//获得字节流

if(!file.isEmpty()){

InputStreamReader inputStreamReader=null;

String url = request.getSession().getServletContext().getRealPath("/upload");

String realPath=url+file.getOriginalFilename();

File tempFile=new File(realPath);

//把文件上传到指定的位置

file.transferTo(tempFile);

//new 两个字节流

InputStream ins1=new FileInputStream(tempFile);

InputStream ins2=new FileInputStream(tempFile);

//new 第一个是用来读取txt前几个字节，来判断编码格式，因为你不确定上传上来的到底是什么格式

byte[]ch=new byte[1024];

ins1.read(ch);

if(Utf8Util.isUtf8(ch)){