java - 如何根据用户的角色对用户进行身份验证？

Question

我需要帮助来验证用户身份，我的数据库有一个名为 person 的表，其属性为 rol，rol 可以是管理员或员工，我希望当用户登录时管理下一个 jsp 显示(main.jsp)和当 rol = employee 显示 (main-act.jsp) 时，我附加查询中的代码以对用户进行身份验证，并登录:

1. 我怎样才能做到这一点？
2. 我如何获得我的角色的值(value)？

public class mysqlquery extends Conexion{
 Connection con = null;

public boolean autenticacion(String name, String  password){
    PreparedStatement pst = null;
    //PreparedStatement pst1=null;
    ResultSet rs = null;
    //ResultSet rs1 = null;
    try {
        String query= "select * from person where name= ? and pass = ?";
        pst = getConexion().prepareCall(consulta);
        pst.setString(1, user);
        pst.setString(2, password); 
        rs = pst.executeQuery();
        if(rs.absolute(1)){
            return true;
        }
    } catch (Exception e) {
        System.err.println("error: "+e);
    }
    return false;
}


public class login extends HttpServlet {

/**
 * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
 * methods.
 *
 * @param request servlet request
 * @param response servlet response
 * @throws ServletException if a servlet-specific error occurs
 * @throws IOException if an I/O error occurs
 */
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    response.setContentType("text/html;charset=UTF-8");
    String name= request.getParameter("name");
    String password= request.getParameter("pass");
    mysqlquery co = new mysqlquery();
    if(co.autenticacion(name, password)){
        HttpSession objsesion = request.getSession(true);
        objsesion.setAttribute("name", name);
        //objsesion.setAttribute("rol", rol);
        response.sendRedirect("main.jsp");
    }else {
        response.sendRedirect("index.jsp");
    }
}

Answer 1

您可以在 mysql 查询类上添加一个名为 userRole 的字段，并存储在 autenticacion 方法调用中从数据库检索到的角色值，如下所示:

public class mysqlquery extends Conexion{
 Connection con = null;
 private String userRole;

 public String getUserRole() { return userRole; }

    public boolean autenticacion(String name, String  password){
        PreparedStatement pst = null;
        //PreparedStatement pst1=null;
        ResultSet rs = null;
        //ResultSet rs1 = null;
        try {
            String query= "select * from person where name= ? and pass = ?";
            pst = getConexion().prepareCall(consulta);
            pst.setString(1, user);
            pst.setString(2, password); 
            rs = pst.executeQuery();
            if(rs.absolute(1)){
                userRole = rs.getString("role");
                return true;
            }
        } catch (Exception e) {
            System.err.println("error: "+e);
        }
        return false;
    }

并在Servlet中，像这样修改:

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    response.setContentType("text/html;charset=UTF-8");
    String name= request.getParameter("name");
    String password= request.getParameter("pass");
    mysqlquery co = new mysqlquery();
    boolean canAuthenticate = co.autenticacion(name, password);
    if(canAuthenticate  && co.getUserRole().equals("admin")){
        //go to admin page
    } else if (canAuthenticate  && co.getUserRole().equals("employee")) {
       //go to employee page
    } else {
        response.sendRedirect("index.jsp");
    }
}

通过这种方式，您可以决定用户是否可以进行身份​​验证(拥有正确的用户名和密码)并根据其角色在页面上重定向它。