云记笔记项目分析(3):退出登录和自动登录

页面设置a标签,href路径为action=logout

servlet层:

else if ("logout".equals(action)){
			//退出登录
			userLogOut(request,response);
		}

	private void userLogOut(HttpServletRequest request,
			HttpServletResponse response) throws IOException {
		//1.销毁session
		request.getSession().invalidate();
		//2.删除cookie
		Cookie cookie = new Cookie("user",null);
		cookie.setMaxAge(0);
		//响应
		response.addCookie(cookie);
		//3.跳转到登录页面
		response.sendRedirect("login.jsp");
		
	}

销毁session方法invalidate()

销毁cookie方法:setMaxAge(0)

自动登录模块

过滤器的设置:

	// 基于HTTP
		HttpServletRequest request = (HttpServletRequest) req;
		HttpServletResponse response = (HttpServletResponse)resp;
		
		// 得到请求的路径
		String requestUri = request.getRequestURI(); // 站点名+资源路径

		String action = request.getParameter("action");
		// 放行指定行为  action (登录操作、自动登录操作)
		if (requestUri.contains("/user")) {
			if ("login".equals(action) || "autoLogin".equals(action)) {
				chain.doFilter(request, response);
				return;
			}
		}
		
		// 登录状态  放行 （session作用域中的user对象不为空）
		User user = (User) request.getSession().getAttribute("user");
		if (user != null) {
			chain.doFilter(request, response);
			return;
		}
		
		// 判断cookie是否为空  如果cookie不为空，得到用户名和密码，调用登录方法
		Cookie[] cookies = request.getCookies();
		// 判断cookie数组是否为空
		if (cookies != null && cookies.length >0) {
			for (Cookie cookie : cookies) {
				String name = cookie.getName();
				if ("user".equals(name)) {
					String value = cookie.getValue();
					if (StringUtil.isEmpty(value)) {
						return;
					}
					String userName = value.split("-")[0];
					String userPwd = value.split("-")[1];
					// 调用登录方法
					request.getRequestDispatcher("user?action=autoLogin&userName=" + userName + "&userPwd=" + userPwd).forward(request, response);
					return;
				}
			}
		}

存cookie时,会设置username-userPwd  

String userName = value.split("-")[0];
 String userPwd = value.split("-")[1];

方便截取字符串获得userName和userPwd

servlet层:

private void autoLogin(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		//用户登录
		ResultInfo<User> resultInfo = loginInfo(request,response);
//		//跳转到首页
//		if (resultInfo.getCode() == 1) {
//			request.getRequestDispatcher("index").forward(request, response);
//		}
//		else {
//			//跳转登录页面
//			response.sendRedirect("login.jsp");
//		}
//			ResultInfo<User> resultInfo = loginInfo(request, response);
		// 跳转到首页
		if (resultInfo.getCode() == 1){
			// 跳转到首页
			response.sendRedirect("index");
		} else {
			// 跳转到登录页面
			response.sendRedirect("login.jsp");
		}		
	}

else if ("autoLogin".equals(action)) {
			//自动登录
			autoLogin(request,response);
			
		}

private ResultInfo<User> loginInfo(HttpServletRequest request,
			HttpServletResponse response) {
		//1.接受参数
		String userName = request.getParameter("userName");
		String userPwd = request.getParameter("userPwd");
		String rem = request.getParameter("tem");
		//2.调用Service层，返回ResultInfo对象
		ResultInfo<User> resultInfo = userService.login(userName, userPwd);
		//3.判断code是否为1，登录成功
		if(resultInfo.getCode()==1){
			//将用户信息存到session作用域中
			request.getSession().setAttribute("user", resultInfo.getResult());
			//判断是否记住密码，是存cookie
			if("1".equals(rem)){
				//创建cookie对象
				Cookie cookie = new Cookie("user",userName+"-"+userPwd);
				//设置cookie失效时间，单位秒
				cookie.setMaxAge(3*24*60*60);
				//响应cookie
				response.addCookie(cookie);
			}
		}
		return resultInfo;
	}
}

service层和dao层都是调用login的方法