为什么无法显示菜品名字和菜品图片

package com.imooc.java;

import java.util.ArrayList;

import java.util.List;

import java.util.Map;

public class FoodDaoImpl {

private static final List<Map<String, Object>> db=new ArrayList<Map<String, Object>>();

//添加菜品

public void addFood(Map<String, Object> food){

//将传入的map集合添加进list集合中

db.add(food);

}

//查询所有菜品信息

public List<Map<String, Object>> getAllFood(){

//这里不知道怎么取出全部信息

return db;

}

//根据菜品名称查询菜品信息

public List<Map<String, Object>> getFoodByName(String foodName){

return null;

}

//菜品修改

public void updateFood(Map<String, Object> food){

}

//根据菜品ID进行删除

public void deleteFoodById(String id){

}

}

package com.imooc.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.DiskFileItem;

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

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

import com.imooc.java.Food;

import com.imooc.java.FoodDaoImpl;

import com.imooc.utils.UploadUtils;

/**

 * Servlet implementation class RegistServlet

 */

@WebServlet("/RegistServlet")

public class RegistServlet extends HttpServlet {

protected void doGet(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

try {

Food food=new Food();

//创建map集合Key值为食品ID value为食品对象

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

//创建一个磁盘文件项工厂对象

DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();

//创建核心解析类

ServletFileUpload servletFileUpload = new ServletFileUpload(diskFileItemFactory);

//解析request请求 返回List集合 List里是fileitem对象

List<FileItem> list = servletFileUpload.parseRequest(request);

//创建FoodDaoImpl对象

FoodDaoImpl fdi=new FoodDaoImpl();

String url=null;

//遍历取出里面的信息

for (FileItem fileItem : list) {

if (fileItem.isFormField()) {

String name = fileItem.getFieldName();

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

System.out.println(name+"    :"+value);

map.put(name, value);

} else {

//修改文件名并输出

String fileName=fileItem.getName();

                    String uuidFileName=UploadUtils.getUUIDFileName(fileName);

                    InputStream is=fileItem.getInputStream();

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

                    url=path+"\\"+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();

}

}

System.out.println(map);

//调用FoodDaoImpl对象方法把集合传到FoodDaoImpl类中

            fdi.addFood(map);

            //重定向跳转

response.sendRedirect(request.getContextPath()+"/le1.jsp");

} catch (FileUploadException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

protected void doPost(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

doGet(request, response);

}

}