如何修复java RequestDispatcher方法中找不到符号提示

我正在使用

login.jsp

（servlet）编写一个基于java RMI web的程序，该程序由

Registration\u interface.java

（java接口）、Registration\u server.java（java类）和login.java组成，但服务器端在

if (rs.next()) {
   RequestDispatcher rd =request.getRequestDispatcher("register.jsp");
   rd.forward(request, response);
}

有人能帮我吗

注册\u interface.java（交互端）

注册\u server.java（服务器端）

login.java（servlet客户端）

import java.io.IOException；
导入java.io.PrintWriter；
导入java.rmi.Naming；
导入java.rmi.NotBoundException；
导入javax.servlet.ServletException；
导入javax.servlet.annotation.WebServlet；
导入javax.servlet.http.HttpServlet；
导入javax.servlet.http.HttpServletRequest；
导入javax.servlet.http.HttpServletResponse；
@WebServlet（urlPatterns={“/login”}）
公共类登录扩展了HttpServlet{
受保护的void doGet（HttpServletRequest请求、HttpServletResponse响应）
抛出ServletException、IOException{
}
受保护的void doPost（HttpServletRequest请求、HttpServletResponse响应）
抛出ServletException、IOException{
//processRequest（请求、响应）；
setContentType（“text/html；charset=UTF-8”）；
PrintWriter out=response.getWriter（）；
试一试{
注册\接口obj=null；
试一试{
obj=（注册_接口）（Naming.lookup（“//localhost:127/RemoteObject1”）；
}捕获（非边界异常）{
e、 printStackTrace（）；
}
字符串User=request.getParameter（“用户”）.toString（）；
String Pass=request.getParameter（“Pass”）.toString（）；
字符串a=对象登录（用户，通过）；
out.println（“您已完成！！！！！！！！！！！”+a）；
//out.println（“register.jsp”）；
}最后{
out.close（）；
}
}
私有void processRequest（HttpServletRequest请求、HttpServletResponse响应）{
抛出新的UnsupportedOperationException（“尚未受支持”）；//若要更改生成的方法体，请选择“工具”“模板”。
}
}

login.jsp（与serlet集成）

登录页面
用户名
将Registration_server.java中的服务对象声明为HttpServletRequest和HttpServletResponse
 不能从未运行servlet容器的服务器使用
request
和
RequestDispatcher
对象。只需删除此代码

RequestDispatcher rd = request.getRequestDispatcher("register.jsp");
rd.forward(request, response);

您必须复制/粘贴来自编译器的实际错误消息，并在代码中指明消息所引用的行。
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.UnicastRemoteObject;
import java.sql.*;
import javax.servlet.RequestDispatcher;

public class Registration_server extends UnicastRemoteObject implements Registration_interface {

    public Registration_server() throws RemoteException {

        System.out.println("server initialized.....");
    }

    public String login(String User, String Pass) throws RemoteException {
        Connection conn = null;

        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/users", "root", "2200");
            String sql = "SELECT * FROM user where UserName=('" + User + "') and Password=('" + Pass + "')";
            Statement st = conn.createStatement();

            ResultSet rs = st.executeQuery(sql);
            if (rs.next()) {
                RequestDispatcher rd = request.getRequestDispatcher("register.jsp");
                rd.forward(request, response);
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
        return "Sucess";

    }

    public static void main(String[] args) {
        Registration_server server = null;
        try {
            server = new Registration_server();
            Registry registry = LocateRegistry.createRegistry(127);// default:1099
            registry.rebind("RemoteObject1", server);
            System.out.println("Server Ready..........");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

import java.io.IOException;
import java.io.PrintWriter;
import java.rmi.Naming;
import java.rmi.NotBoundException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(urlPatterns = {"/login"})
public class login extends HttpServlet {

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //processRequest(request, response);
        response.setContentType("text/html;charset=UTF-8");

        PrintWriter out = response.getWriter();

        try {
            Registration_interface obj = null;
            try {

                obj = (Registration_interface) (Naming.lookup("//localhost:127/RemoteObject1"));
            } catch (NotBoundException e) {
                e.printStackTrace();
            }

            String User = request.getParameter("User").toString();
            String Pass = request.getParameter("Pass").toString();

            String a = obj.login(User, Pass);

            out.println("<u><b> You completed!!!!!!!!!!!!!!</b></u>" + a);
            //out.println("<include>register.jsp<include>");
        } finally {

            out.close();

        }
    }

    private void processRequest(HttpServletRequest request, HttpServletResponse response) {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }

}

RequestDispatcher rd = request.getRequestDispatcher("register.jsp");
rd.forward(request, response);