输出正常但是在文件夹里没有显示图片

package com.imooc.web.servlet;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;

import org.apache.commons.fileupload.FileUploadException;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

import com.imooc.service.UserService;

import com.imooc.service.impl.UserServicelmpl;

import com.imooc.utils.UploadUtils;

import com.imooc.web.listener.User;

/**

 * Servlet implementation class RegistServlet

 */

@WebServlet("/RegistServlet")

public class RegistServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

/**

* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

*/

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

//接受数据

Map<String,String> map = new HashMap<String,String>();

DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();

ServletFileUpload fileUpload = new ServletFileUpload(diskFileItemFactory);

List<FileItem> list;

try {

list = fileUpload.parseRequest(request);

for(FileItem fileItem:list) {

if(fileItem.isFormField()) {

String name = fileItem.getFieldName();

String value = fileItem.getString("UTF-8");

map.put(name,value);

}else {

String fileName = fileItem.getName();

String uuidFileName = UploadUtils.getUuidFileName(fileName);

InputStream is = fileItem.getInputStream();

String path = getServletContext().getRealPath("/upload");

String url = path+"\\"+uuidFileName;

map.put("path", request.getContextPath()+"/upload/"+uuidFileName);

OutputStream os = new FileOutputStream(url);

int len = 0;

byte[] b = new byte[1024];

while((len = is.read(b)) != -1) {

os.write(b, 0, len);

}

is.close();

os.close();

}

}

} catch (FileUploadException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

User user = new User();

user.setUserName(map.get("username"));

user.setPassword(map.get("password"));

user.setPath(map.get("path"));

System.out.println(user);

UserService userService = new UserServicelmpl();

List<User>userList = (List<User>)getServletContext().getAttribute("userList");

userService.regist(userList, user);

System.out.println(userList);

response.sendRedirect(request.getContextPath()+"/login.jsp");

}

/**

* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

*/

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

doGet(request, response);

}

}