谁有Ajax异步调用后台 实现简单的登录错误提示的实例？
框架是SSH，其中Action是DispatchAction；
SSH + JSP + MYSQL
Ajax实现页面不刷新 并且把“用户名不正确”、“密码输入有误”这样的提示显示在登录框的下面
[解决办法]
<script type="text/javascript">
/*提交验证，异步传输*/
$(document).ready(function(){
$("form").submit(function (){
if ($("#name").val() == ''
[解决办法]
$("#password").val() == ''){
alert("帐号和密码不能为空!");
return false;
}else{
$.ajax({
url: 'LoginServlet', //处理测试页面,注意返回内容，成功返回OK
dataType: 'text',
data: $("form").serialize(),
success: function (msg) {
if (msg == "ok"){
window.location.href = "IndexServlet";
}else{
alert("帐号或密码不正确，请您重新输入!");
return;
}
}
});
}
return false; ////////////////要阻止表单提交
});
});
</script>
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
//获取帐号密码
String name = request.getParameter("name");
String password = request.getParameter("password");
String remerber = request.getParameter("remerber_password");
UsersService usersService = Factory.getUsersService();
//获取验证后的用户实体类
Users users = usersService.checkLogin(name, password);
if(users.getId() != 0){
//把用户信息放入session中
request.getSession().setAttribute("users", users);
if("on".equals(remerber)){
Cookie cookieuser = new Cookie("user",name+"-"+password);
//设定有效时间 以秒(s)为单位 保存1个星期
cookieuser.setMaxAge(60*60*24*7);
response.addCookie(cookieuser);
}
//跳到IndexServlet中
//response.sendRedirect("IndexServlet?name="+name);
out.print("ok");
}else{
//response.sendRedirect("fail.jsp");
out.print("error");
}
out.flush();
out.close();
}
