$.post做登陆重启tomcat之后需要登陆两次才能进到注意面

Question

前台

  $.post("/baas/ykservlet", {"action":"LoginData","username":username,"password":password}, function (data) {
        var a =data.split(",");
        var count = a[0];
        var name = a[2];
        var id = a[1];
        if(count>0){
            $.cookie("uid", username, { expires: 365 ,path: '/'});
            $.cookie("name", name, { expires: 365 ,path: '/'});
            $.cookie("id", id, { expires: 365 ,path: '/'});
            window.location.href="../x5/UI2/ykdata/mainA.html";
        }else{
            alert("用户名或密码不正确，请重新登录！");
            //history.go(0);
        }       
    }); 
        后台
        try {
                Statement ps = conn.createStatement(); 
                ResultSet rs;
                String sql;
                String count;
                String username = request.getParameter ( "username" );
                String password = request.getParameter ( "password" );
                sql="select count(*),teacher_id,teacher_name from pub_teacher where teacher_code='" + username + "' and pass_word = '" + password + "'";
                rs = ps.executeQuery(sql); 
                if (rs.next()){
                    count=rs.getString(1)+","+rs.getString(2)+","+rs.getString(3);
                    response.setContentType("text/html;charset=UTF-8"); 
                    response.getWriter().write(count);
                }   
                if(rs != null) rs.close();
                if(ps != null) ps.close();
        } catch (Exception e) {

        }

只要重启tomcat之后用户名和密码输入不管对错第一次都是没反应，第二次才会做相应的操作

Answer 1

第一次没任何反应？界面弹出框没谈？那第一次百分百进入catch语句块了，看你报的异常