Servlet

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.File;
import java.io.IOException;

@WebServlet(name = "Servlet", urlPatterns = "/Servlet")
@MultipartConfig//单文件上传
public class Servlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        String ufp = request.getSession().getServletContext().getRealPath("upload/");
        try {
            File file=new File(ufp);
            if (!file.exists()){
                file.mkdir();
            }
            Part part=request.getPart("ufile");
            String fileName=exf(part);
            part.write(ufp+File.separator+fileName);
            String message="上传文件名成功"+fileName;
            request.setAttribute("message",message);
            request.getRequestDispatcher("show.jsp")
                    .forward(request,response);
        }catch (Exception e){
            e.printStackTrace();
        }
    }
    private String exf(Part part) {
        String a=part.getHeader("content-disposition");
        String [] items=a.split(";");
        for (String s:items){
           if (s.trim().startsWith("filename")){
                return s.substring(s.indexOf("=")+2,s.length()-1);
            }
        }
        return "";
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request,response);
    }
}

jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
上传文件：

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