jdbc中的rs赋不上值，导致代码运行错误，求帮助

package com.xiaoan.javaweb.denglu;

import com.xiaoan.javaweb.utils.JdbcUtils;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

@WebServlet({"/login/denlu"})
public class login extends HttpServlet {
@Override
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String path = request.getServletPath();
if("/login/denlu".equals(path)){
dologin(request,response);
}
}

private void dologin(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String username = request.getParameter("username");
    String password = request.getParameter("password");
    Connection conn = JdbcUtils.getConnection();
    String sql = "select * from t_user1 where uname = ? and psw = ?";
    ResultSet rs = null;
    PreparedStatement ps = null;
    Boolean sc = false;
    try {
        ps = conn.prepareStatement(sql);
        ps.setString(1,username);
        ps.setString(2,password);
        //rs赋值不上，就错在这里，之前一切正确 
        rs = ps.executeQuery();
        if(rs.next()){
            sc = true;
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }finally {
        JdbcUtils.close(conn,ps,rs);
    }
    if(sc){
        response.sendRedirect(request.getContextPath()+"/login/denlu");
    }else{
        System.out.println("登陆失败");
    }
}

}

赋不上值？报错信息呢

你打个断点看看有没有查询出数据，如果没有查出数据，肯定也就不会有值了。同时看看那两个参数有没有数据传递过来。