写登录界面login.jsp
<h1>用户登录</h1> <hr> <% request.setCharacterEncoding("utf-8"); String username=""; String password = ""; Cookie[] cookies = request.getCookies(); if(cookies!=null&&cookies.length>0) { for(Cookie c:cookies) { if(c.getName().equals("username")) { username = URLDecoder.decode(c.getValue(),"utf-8"); } if(c.getName().equals("password")) { password = URLDecoder.decode(c.getValue(),"utf-8"); } } } %> <form name="loginForm" action="dologin.jsp" method="post"> <table> <tr> <td>用户名：</td> <td><input type="text" name="username" value="<%=username %>"/></td> </tr> <tr> <td>密码：</td> <td><input type="password" name="password" value="<%=password %>" /></td> </tr> <tr> <td colspan="2"><input type="checkbox" name="isUseCookie" checked="checked"/>十天内登陆记住账号和密码</td> </tr> <tr> <td colspan="2" align="center"><input type="submit" value="登录"/><input type="reset" value="取消"/></td> </tr> </table> </form>
处理登录界面提交的信息dologin.jsp
<% request.setCharacterEncoding("utf-8"); //首先判断用户是否选择了记住登录状态 String[] isUseCookies = request.getParameterValues("isUseCookie"); if(isUseCookies!=null&&isUseCookies.length>0) { //把用户名和密码保存在Cookie对象里面 String username = URLEncoder.encode(request.getParameter("username"),"utf-8"); //使用URLEncoder解决无法在Cookie当中保存中文字符串问题 String password = URLEncoder.encode(request.getParameter("password"),"utf-8"); Cookie usernameCookie = new Cookie("username",username); Cookie passwordCookie = new Cookie("password",password); usernameCookie.setMaxAge(864000); passwordCookie.setMaxAge(864000);//设置最大生存期限为10天 response.addCookie(usernameCookie); response.addCookie(passwordCookie); } else { Cookie[] cookies = request.getCookies(); if(cookies!=null&&cookies.length>0) { for(Cookie c:cookies) { if(c.getName().equals("username")||c.getName().equals("password")) { c.setMaxAge(0); //设置Cookie失效 response.addCookie(c); //重新保存。 } } } } %> <a href="user.jsp" target="_blank">查看用户信息</a>
查看用户信息user.jsp
<% request.setCharacterEncoding("utf-8"); String username=""; String password = ""; Cookie[] cookies = request.getCookies(); if(cookies!=null&&cookies.length>0) { for(Cookie c:cookies) { if(c.getName().equals("username")) { username = URLDecoder.decode(c.getValue(),"utf-8"); } if(c.getName().equals("password")) { password = URLDecoder.decode(c.getValue(),"utf-8"); } } } %> 用户名：<%=username %><br> 密码：<%=password %><br>
