在jsp中，如何实现普通用户和管理员登陆后跳转到不同的点jsp页面

在jsp中可以通过角色控制表跳转不同的页面。
参考代码如下：

package myservlet;
import mybean.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class IsLogin extends HttpServlet{
public void init(ServletConfig config) throws ServletException{
super.init(config);
}
public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{
//接收参数
String user=request.getParameter("user");
String password=request.getParameter("password");
String actor=request.getParameter("actor");
//加载驱动，建立连接
Connection con;
Statement sql;
ResultSet rs;
try{
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
}catch(Exception e){
System.out.print(e);
}

try{
String uri="jdbc:sqlserver://127.0.0.1:1433;DatabaseName=student";
con=DriverManager.getConnection(uri,"sa","940712");//数据库的登录名 sa 940712
sql=con.createStatement();
//通过if语句判断角色，将其账号密码与数据库的userInf内的信息进行比对（角色的账号密码统一存储在UserInf表中）
//若正确，转发至角色对应的登录成功界面；若没有，统一转发至出错界面，提供返回链接供重新登录
if(actor=="student"){
rs=sql.executeQuery("select userIs,password from userInf where actor='student'");
while(rs.next()){
if(user==rs.getString(1) && password==rs.getString(2)){
RequestDispatcher dispatcher=request.getRequestDispatcher("loginSuccessS.jsp");
dispatcher.forward(request,response);
}
}
RequestDispatcher dispatcher=request.getRequestDispatcher("loginError.jsp");
dispatcher.forward(request,response);
}
//普通用户角色控制
else if(actor=="teacher"){
rs=sql.executeQuery("select userIs,password from userInf where actor='teacher'");
while(rs.next()){
if(user==rs.getString(1) && password==rs.getString(2)){
RequestDispatcher dispatcher=request.getRequestDispatcher("loginSuccessT.jsp");
dispatcher.forward(request,response);
}
}
RequestDispatcher dispatcher=request.getRequestDispatcher("loginError.jsp");
dispatcher.forward(request,response);
}
//管理员角色控制
else if(actor=="admin"){
rs=sql.executeQuery("select userIs,password from userInf where actor='admin'");
while(rs.next()){
if(user==rs.getString(1) && password==rs.getString(2)){
RequestDispatcher dispatcher=request.getRequestDispatcher("loginSuccessA.jsp");
dispatcher.forward(request,response);
}
}
RequestDispatcher dispatcher=request.getRequestDispatcher("loginError.jsp");
dispatcher.forward(request,response);
}
}catch(SQLException e){
//System.out.print("您的账号或密码错误，请返回重新输入");
RequestDispatcher dispatcher=request.getRequestDispatcher("loginError.jsp");
dispatcher.forward(request,response);
}
}
}

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