为什么我只打印这些？后面list跟map里的打印不出来？

package servlet;

import java.io.IOException;
import java.util.ArrayList;
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 bean.Users;

@WebServlet("/registServlet")
public class RegistServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    public RegistServlet() {
        super();
    }

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

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
				try {
					//数据接收
					//文件上传的基本操作
					Map<String, String> map = new HashMap<String, String>();
					//1. 创建一个磁盘文件想的工厂
					DiskFileItemFactory fac = new DiskFileItemFactory();
					//2.创建一个核心解析类
					ServletFileUpload ser = new ServletFileUpload(fac);
					//3.解析request请求，返回的是一个list的集合，list集合中存放的是fileitem对象
					List<FileItem> list = ser.parseRequest(request);
					List<String> hobbyList = new ArrayList<String>();
					//4.遍历集合，获得每个fileitem，判断是表单项还是文件上传项
					for (FileItem it : list) {
						//判断是表单项还是文件上传项
						if(it.isFormField()){
							//普通项
							//接收表单项的参数
							String name = it.getFieldName();
							String value = it.getString("utf-8");
							System.out.println(name+"  "+ value);
							if("hobby".equals(name)){
								String hobbyValue = it.getString("utf-8");
								hobbyList.add(hobbyValue);
								System.out.println(name+" " +hobbyList);
								map.put(name, hobbyValue);
							}else{
								map.put(name, value);
							}
							
						}else{
							//文件上传项
							//文件上传功能
						}
						System.out.println(map);
					}
					
					Users u = new Users();
					u.setUsername(map.get("username"));
					u.setPassword(map.get("password"));
					u.setSex(map.get("sex"));
					u.setNickname(map.get("nickname"));
					u.setHobby(map.get("hobby"));
					u.setPath(map.get("path"));
					List<Users> userList = (List<Users>) this.getServletContext().getAttribute("list");
					userList.add(u);
					for (Users users : userList) {
						System.out.println(users);
					}
					this.getServletContext().setAttribute("list", userList);
				} catch (FileUploadException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
		
		
		
	
	}

}