package com.tgb.util;

import com.tgb.entity.User;

public class ThreadCache {
	private static ThreadLocal<User> threadLocal;
	static {
		threadLocal= new ThreadLocal<User>();
	}
	public static User getUser(){
		return threadLocal.get();
	}
	public static void setUser(User user){
		threadLocal.set(user);
	}
}

Servlet

package com.tgb.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.tgb.entity.User;
import com.tgb.service.UserManagerService;
import com.tgb.util.ThreadCache;

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

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		int id = Integer.parseInt(request.getParameter("id"));
		String name = request.getParameter("name");
		String password = request.getParameter("password");
		
		User user = new User();
		user.setId(id);
		user.setName(name);
		user.setPassword(password);
		ThreadCache.setUser(user);
		
		UserManagerService userManagerService = new UserManagerService();
		User getUser = userManagerService.getUser();
		System.out.println(getUser);
		
	    response.sendRedirect(request.getContextPath() + "/index.jsp");
	}
}

Dao

package com.tgb.dao;

import com.tgb.entity.User;
import com.tgb.util.ThreadCache;

public class UserDao {
	public User getUser(){
		return ThreadCache.getUser();
	}
}

增强版Demo

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