006三天免登陆（部分代码）+后台管理系统（部分代码）

一.三天免登陆（部分代码）

package com.bjsxt.servlet;

import java.io.IOException;

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

import com.bjsxt.pojo.User;
import com.bjsxt.service.LoginService;
import com.bjsxt.service.impl.LoginServiceImpl;

public class LoginServlet extends HttpServlet {
	@Override
	protected void service(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		//设置请求编码格式:
			req.setCharacterEncoding("utf-8");
		//设置响应编码格式
			resp.setContentType("text/html;charset=utf-8");
		//获取请求信息
			String uname=req.getParameter("uname");
			//uname=new String(uname.getBytes("iso8859-1"),"utf-8");//使用String进行数据重新编码
			String pwd=req.getParameter("pwd");
			System.out.println(uname+":"+pwd);
		//处理请求信息
			//获取业务层对象
			LoginService ls=new LoginServiceImpl();
			User u=ls.checkLoginService(uname, pwd);
			System.out.println(u);
		//响应处理结果
			if(u!=null){
				//创建Cookie信息实现三天免登录。
					Cookie c=new Cookie("uid", u.getUid()+"");
					//设置Cookie的有效期
					c.setMaxAge(3*24*3600);
					c.setPath("/login/ck");
					//添加Cookie信息
					resp.addCookie(c);
				//请求转发
					//req.getRequestDispatcher("main").forward(req, resp);
				//重定向
				resp.sendRedirect("/login/main");
				return;
			}else{
				//使用request对象实现不同Servlet的数据流转
				req.setAttribute("str", "用户名或密码错误");
				//使用请求转发
				req.getRequestDispatcher("page").forward(req, resp);
				return;
			}
	}
}

package com.bjsxt.servlet;

import java.io.IOException;

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

import com.bjsxt.pojo.User;
import com.bjsxt.service.LoginService;
import com.bjsxt.service.impl.LoginServiceImpl;
/**
 * Cookie信息校验
 * 		判断请求中是否携带正确的Cookie信息
 * 		如果有则校验Cookie信息是否正确
 * 			如果校验正确则直接响应主页面给用户
 * 			如果校验不正确则响应登录页面给用户
 * 		没有则请求转发给登录页面
 * @author MyPC
 */
public class CookieServlet extends HttpServlet {
	@Override
	protected void service(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		//设置请求编码格式
			req.setCharacterEncoding("utf-8");
		//设置响应编码格式
			resp.setContentType("text/html;charset=utf-8");
		//获取请求信息
			//获取Cookie信息
			Cookie[] cks=req.getCookies();
		//处理请求信息
			if(cks!=null){
				//遍历Cookie信息
					String uid="";
					for(Cookie c:cks){
						if("uid".equals(c.getName())){
							uid=c.getValue();
						}
					}
				//校验UID是否存在
					if("".equals(uid)){
						//请求转发
						req.getRequestDispatcher("page").forward(req, resp);
						return;
					}else{
						//校验UID用户信息
							//获取业务层对象
							LoginService ls=new LoginServiceImpl();
							User u=ls.checkUidService(uid);
							if(u!=null){
								//重定向
								resp.sendRedirect("/login/main");
								return;
							}else{
								//请求转发
								req.getRequestDispatcher("page").forward(req, resp);
								return;
							}
					}
				
			}else{
				//响应处理结果
					//请求转发
					req.getRequestDispatcher("page").forward(req, resp);
					return;
			}
	}
}

二.后台管理系统（部分代码）

package com.bjsxt.servlet;

import java.io.IOException;
import java.util.List;

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

import org.apache.log4j.Logger;

import com.bjsxt.pojo.User;
import com.bjsxt.service.UserService;
import com.bjsxt.service.impl.UserServiceImpl;
/**
 * Servlet重定向路径总结：
 * 	相对路径：从当前请求的路径查找资源的路径
 * 		相对路径如果servlet的别名中包含目录，会造成重定向资源查找失败。
 * 	绝对路径：第一个/表示服务器根目录
 * 		/虚拟项目名/资源路径
 * 
 * Servlet请求转发：
 * 		/表示项目根目录。
 * 		req.getRequestDispatcher("/资源路径").forward(req, resp);
 * 
 * @author MyPC
 *
 */
public class UserServlet extends HttpServlet {
	//声明日志对象
	Logger logger =Logger.getLogger(UserServlet.class);
	//获取service层对象
	UserService us=new UserServiceImpl();
	@Override
	protected void service(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		//设置请求编码格式
		req.setCharacterEncoding("utf-8");
		//设置响应编码格式
		resp.setContentType("text/html;charset=utf-8");
		//获取操做符
		String oper=req.getParameter("oper");
		if("login".equals(oper)){
			//调用登录处理方法
			checkUserLogin(req,resp);
		}else if("out".equals(oper)){
			//调用退出功能
			userOut(req,resp);
		}else if("pwd".equals(oper)){
			//调用密码修改功能
			userChangePwd(req,resp);	
		}else if("show".equals(oper)){
			//调用显示所有用户功能
			userShow(req,resp);
		}else if("reg".equals(oper)){
			//调用注册功能
			userReg(req,resp);
		}else{
			logger.debug("没有找到对应的操作符："+oper);
		}
	}
	//注册用户
	private void userReg(HttpServletRequest req, HttpServletResponse resp) throws IOException {
		//获取请求信息
			String uname=req.getParameter("uname");
			String pwd=req.getParameter("pwd");
			String sex=req.getParameter("sex");
			int age=req.getParameter("age")!=""?Integer.parseInt(req.getParameter("age")):0;
			String birth=req.getParameter("birth");
			String[] bs=null;
			if(birth!=""){
				bs=birth.split("/");
				birth=bs[2]+"-"+bs[0]+"-"+bs[1];
			}
			System.out.println(uname+":"+pwd+":"+sex+":"+age+":"+birth);
			User u=new User(0, uname, pwd, sex, age, birth);
		//处理请求信息
			//调用业务层处理
			int index=us.userRegService(u);
		//响应处理结果
			if(index>0){
				//获取session
				HttpSession hs=req.getSession();
				hs.setAttribute("reg", "true");
				//重定向
				resp.sendRedirect("/mg/login.jsp");
			}
		
	}
	//显示所有的用户信息
	private void userShow(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		//处理请求
			//调用service
			List<User> lu=us.userShowService();
			//判断
			if(lu!=null){
				//将查询的用户数据存储到request对象
				req.setAttribute("lu",lu);
				//请求转发
				req.getRequestDispatcher("/user/showUser.jsp").forward(req, resp);
				return;
			}
		
	}
	//用户修改密码
	private void userChangePwd(HttpServletRequest req, HttpServletResponse resp) throws IOException {
		//获取数据
			String newPwd=req.getParameter("newPwd");
			//从session中获取用户信息
			User u=(User)req.getSession().getAttribute("user");
			int uid=u.getUid();
		//处理请求
			//调用service处理
			int index=us.userChangePwdService(newPwd,uid);
			if(index>0){
				//获取session对象
				HttpSession hs=req.getSession();
				hs.setAttribute("pwd","true");
				//重定向到登录页面
				resp.sendRedirect("/mg/login.jsp");
			}
	}
	//用户退出
	private void userOut(HttpServletRequest req, HttpServletResponse resp) throws IOException {
		//获取session对象
		HttpSession hs=req.getSession();
		//强制销毁session
		hs.invalidate();
		//重定向到登录页面
		resp.sendRedirect("/mg/login.jsp");
	}
	//处理登录
	private void checkUserLogin(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {
				//获取请求信息
				String uname=req.getParameter("uname");
				String pwd=req.getParameter("pwd");
				//处理请求信息
					//校验
					User u=us.checkUserLoginService(uname, pwd);
					if(u!=null){
						//获取session对象
						HttpSession hs=req.getSession();
						//将用户数据存储到session中
						hs.setAttribute("user", u);
						//重定向
						resp.sendRedirect("/mg/main/main.jsp");
						return;
					}else{
						//添加标识符到request中
						req.setAttribute("flag",0);
						//请求转发
						req.getRequestDispatcher("/login.jsp").forward(req, resp);
						return;
					}
				//响应处理结果
					//直接响应
					//请求转发
					
					
	}
	
	
}

package com.bjsxt.service.impl;

import java.util.List;

import org.apache.log4j.Logger;

import com.bjsxt.dao.UserDao;
import com.bjsxt.dao.impl.UserDaoImpl;
import com.bjsxt.pojo.User;
import com.bjsxt.service.UserService;

public class UserServiceImpl implements UserService{
	
	//声明日志对象
	Logger logger=Logger.getLogger(UserServiceImpl.class);
	//声明Dao层对象
	UserDao ud=new UserDaoImpl();
	//用户登录
	@Override
	public User checkUserLoginService(String uname, String pwd) {
		//打印日志
		logger.debug(uname+"发起登录请求");
		User u=ud.checkUserLoginDao(uname, pwd);
		//判断
		if(u!=null){
			logger.debug(uname+"登录成功");
		}else{
			logger.debug(uname+"登录失败");
		}
		return u;
	}
	//修改用户密码
	@Override
	public int userChangePwdService(String newPwd, int uid) {
		logger.debug(uid+":发起密码请求");
		int index=ud.userChangePwdDao(newPwd,uid);
		if(index>0){
			logger.debug(uid+":密码修改成功");
		}else{
			logger.debug(uid+":密码修改失败");
		}
		return index;
	}
	//获取所有的用户信息
	@Override
	public List<User> userShowService() {
		List<User> lu=ud.userShowDao();
		logger.debug("显示所有用户信息："+lu);
		return lu;
	}
	//用户注册
		@Override
		public int userRegService(User u) {
			return ud.userRegDao(u);
		}
	
}

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>欢迎登录后台管理系统</title>
<link href="css/style.css" rel="stylesheet" type="text/css" />
<script language="JavaScript" src="js/jquery.js"></script>
<script src="js/cloud.js" type="text/javascript"></script>

<script language="javascript">
	$(function(){
    $('.loginbox').css({'position':'absolute','left':($(window).width()-692)/2});
	$(window).resize(function(){  
    $('.loginbox').css({'position':'absolute','left':($(window).width()-692)/2});
    })  
});  
</script> 

</head>

<body style="background-color:#df7611; background-image:url(images/light.png); background-repeat:no-repeat; background-position:center top; overflow:hidden;">



    <div id="mainBody">
      <div id="cloud1" class="cloud"></div>
      <div id="cloud2" class="cloud"></div>
    </div>  


<div class="logintop">    
    <span>欢迎登录后台管理界面平台</span>    
    </div>
    
    <div class="loginbody">
    
    <span class="systemlogo"></span> 
    <br />
    <%
    	//声明java代码块进行错误提示语的逻辑校验
    	Object obj=request.getAttribute("flag");
    	if(obj!=null){
    %>
	    <div style="text-align: center;">
	     <span style="font-size: 15px;color:darkred;font-weight: bold;">用户名或者密码错误</span>
	    </div>
    <%} %>
   <%
    	//声明java代码块进行密码修改提示语
    	Object pwd=session.getAttribute("pwd");
    	if(pwd!=null){
    %>
	    <div style="text-align: center;">
	     <span style="font-size: 15px;color:darkred;font-weight: bold;">密码修改成功</span>
	    </div>
    <%}
    	session.removeAttribute("pwd");
    %>
       <%
    	//声明java代码块进行注册提示语
    	Object reg=session.getAttribute("reg");
    	if(reg!=null){
    %>
	    <div style="text-align: center;">
	     <span style="font-size: 15px;color:darkred;font-weight: bold;">注册成功</span>
	    </div>
    <%}
    	session.removeAttribute("reg");
    %>
    <div class="loginbox loginbox1">
    <form action="user" method="post">
    	<input type="hidden" name="oper" value="login" />
    	<ul>
    	<li></li>
	    <li><input name="uname" type="text" placeholder="用户名" class="loginuser"  /></li>
	    <li><input name="pwd" type="password" placeholder="密码" class="loginpwd"  /></li>
	    <li class="yzm">
	    <span><input name="" type="text" value="验证码" οnclick="JavaScript:this.value=''"/></span><cite>X3D5S</cite> 
	    </li>
	    <li><input name="" type="submit" class="loginbtn" value="登录"  οnclick="javascript:window.location='main.html'"  /><label><a href="user/reg.jsp">注册</a></label><label><a href="#">忘记密码？</a></label></li>
	   </ul>
    </form>
    
    </div>
    
    </div>
    
    
    <div class="loginbm">版权所有 尚学堂  <a href="http://www.uimaker.com">uimaker.com</a>  仅供学习交流，勿用于任何商业用途，交流QQ：189088900878</div>
	
    
</body>

</html>