如何从servlet在jsp中显示警报然后重定向到另一个jsp? [英] How to show alert in a jsp from a servlet and then redirect to another jsp?

问题描述

我试过了，但不显示消息仅重定向登录.jsp

<form method="post" action="Login_Servlet" >
  <input name="idUsuario" type="text"/>
  <input  name="password" type="password" />
  <button type="submit">Entrar</button>
</form>

Login_Servlet

response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
String userid= request.getParameter("idUser");        
String password = request.getParameter("password");
Login_Service login_Service = new Login_Service();
boolean result = login_Servicio.aut(userid, password);
Usuario user = login_Servicio.getUsuariosByUsuario(userid);
    if(result == true){
       request.getSession().setAttribute("user", user);            
       response.sendRedirect("vistas/Inicio.jsp");
    }
     else{
       out.println("<script type="text/javascript">");
       out.println("alert('User or password incorrect');");
       out.println("</script>");
       response.sendRedirect("index.jsp");    
    }

是否可以显示这样的消息?如果是这样，我做错了吗?

推荐答案

你可能会这样做:

else
{
   out.println("<script type="text/javascript">");
   out.println("alert('User or password incorrect');");
   out.println("location='index.jsp';");
   out.println("</script>");
}

2018 年 3 月 20^th IST 08:19

Edited: 20^th March 2018, 08:19 IST

OR 不使用js

else {
   out.println("<meta http-equiv='refresh' content='3;URL=index.jsp'>");//redirects after 3 seconds
   out.println("<p style='color:red;'>User or password incorrect!</p>");
}

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