Codeigniter登录问题

Question

I'm having difficulties in understanding what's going on here.

I've made a login page, setting it to go to admin page. Without any user data yet, just to check if it's working. And It doesn't go. I hade some problems loading the library form_validation. So I added the parent construct.

Controller

class Login Extends CI_Controller{
public function __construct()
{
    parent::__construct();
    $this->load->helper('url'); 

}

public function index() {

    $this->load->view('login');
    $this->load->helper('url'); 

}

public function login() {

    $this->load->library('form_validation');
    $this->load->helper('url'); 
    $this->form_validation->set_rules('username','Username','trim|required');
    $this->form_validation->set_rules('password','Password','trim|required|md5');
    if($this->form_validation->run()==false){
        $this->index();
    }else{
        $user_session=array(
            'Username'      => $this->input->post('username'),
            'Password'      => $this->input->post('password'),
            'is_logged_in'  => 1
        );
        $this->session->set_userdata($user_session);
        redirect('login/admin');
    }

}



public function admin() {
    $this->load->view('admin');

}

}

My Login View

 <section class="login_content">
        <?php echo validation_errors(); ?>
        <form action="<?php echo base_url().'login/login'; ?>" method="post">
        <h1>Login no Sistema</h1>
        <div>
            <input type="text" name="username" class="form-control" placeholder="Username" required="" />
        </div>
        <div>
            <input type="password" name="password" class="form-control" placeholder="Password" required="" />
        </div>
        <div>
            <input type="submit" name="submit" value="Login" />

        </div>
        <div class="clearfix"></div>
        <div class="separator">


          <div class="clearfix"></div>
          <br />
          <div>
            <h1> Sitio Monica e Marcia</h1>

            <p>©2016 Todos os direitos reservados. Sitio Monica e Marcia.</p>
          </div>
        </div>
      </form>
      <!-- form -->
    </section>

My Admin View

 <div id="login" class="animate form">
    <section class="login_content">
        <h1>Bem vindo ao Admin</h1>
        <?php 
            echo '<pre>';
            print_r($this->session->all_userdata());
            echo '<pre>';

        ?>
      <!-- form -->
    </section>
    <!-- content -->
  </div>

Answer 1

Here Is Your Controller

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
    /* Description: Login controller class*/
 class Login extends CI_Controller{

function __construct(){
    parent::__construct();

    $this->load->library('session');
     $this->load->model('login_model');

}

public function admin($msg = NULL){
    // Load our view to be displayed
    // to the user
    $data['msg'] = $msg;
    if($msg == NULL)
    {

    $this->load->view('login');
    }
    else
    {
        //print_r($data);
    //die();
    $this->load->view('login',$data);
    }
}

 public function process(){
    // Load the model

    // Validate the user can login
    $result = $this->login_model->validate();
    // Now we verify the result
    if(! $result){
        // If user did not validate, then show them login page again
        $msg = 'Invalid username or password';
        $this->admin($msg);
    }else{
        // If user did validate, 
        // Send them to members area
        redirect('home/check_isvalidated');
    }        
}
public function doLogout(){

    $this->session->sess_destroy();
    redirect(base_url());
   }
 }

Here IS The Model You Can Use Validation instead of Security

public function validate(){
    // grab user input
    $username = $this->security->xss_clean($this->input->post('user_name'));
    $password = $this->security->xss_clean(md5($this->input->post('password')));

    // Prep the query
    $this->db->where('user_name', $username);
    $this->db->where('password', $password);

    // Run the query
    $query = $this->db->get('admin');
    // Let's check if there are any results
    if($query->num_rows == 1)
    {
        // If there is a user, then create session data
        $row = $query->row();
        $data = array(
                'id' => $row->id,
                'user_name' => $row->user_name,
                'validated' => true
                );
        $this->session->set_userdata($data);
        return true;
    }
    // If the previous process did not validate
    // then return false.
    else {
    return false;
    }
  }
}