idea 获取的真实路径不一样，获取到在out的文件里

package cn.cdb.servlet;

import cn.cdb.img.img;
import cn.cdb.person.user;
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 javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class zuceYZ extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request,response);

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        try {
            //创建map集合
            Map<String,String> map = new HashMap<String,String>();
            //创建磁盘文件项工厂
            DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();
            //创建核心解析类
            ServletFileUpload servletFileUpload = new ServletFileUpload(diskFileItemFactory);
            //解析request请求
            List<FileItem> list = servletFileUpload.parseRequest(request);
            List<String> hobbylist = new ArrayList<String>();
            for (FileItem fileItem : list) {
                if(fileItem.isFormField()){
                    //普通表单项
                    //接受表单项的值
                    String name = fileItem.getFieldName();
                    String value = fileItem.getString("UTF-8");
                    System.out.println(name + "  " + value);
                    if("hobby".equals(name)){
                        String hobbyvalue = fileItem.getString("UTF-8");
                        hobbylist.add(hobbyvalue);
                        hobbyvalue = hobbylist.toString().substring(1,hobbylist.toString().length()-1);
                        System.out.println(name +  "   " + hobbyvalue);
                        map.put(name,hobbyvalue);
                    }
                    else {
                        map.put(name,value);
                    }
                }
                else{


                    /**
                     * 文件上传项
                     * 文件上传功能
                     */
                    //获取上传的文件名
                    String filename = fileItem.getName();
                    //随机生成文件名
                    String uuidname = img.imgid(filename);
                    //获取存放上传文件夹的真实路径
                    String realname = this.getServletContext().getRealPath("img-shangchuan");
                    //生成文件路径
                    String url = realname + "\\"  + uuidname;
                    //将文件写入输入流中
                    InputStream inputStream = fileItem.getInputStream();
                    //将文件写到输出流中
                    OutputStream outputStream = new FileOutputStream(url);
                    //输出
                    int len = 0;
                    byte[] b = new byte[1024];
                    while((len = inputStream.read(b)) !=-1){
                        outputStream.write(b,0,len);
                    }
                    inputStream.close();
                    outputStream.close();
                }

            }
            user user = new user();
            user.setUsername(map.get("username"));
            user.setPassword(map.get("password"));
            user.setNicheng(map.get("nicheng"));
            user.setSex(map.get("sex"));
            user.setHobby(map.get("hobby"));
            List<user> userlist = (List<user>) this.getServletContext().getAttribute("list");
            userlist.add(user);
            for(user u:userlist){
                System.out.println(u);
            }
            this.getServletContext().setAttribute("list",userlist);
            System.out.println(map);
            System.out.println(this.getServletContext().getRealPath("img-shangchuan"));
        } catch (FileUploadException e) {
            e.printStackTrace();
        }
    }
}