如何在servlet中获取spring创建的bean

package com.yxf.controller;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import com.yxf.bean.User;
import com.yxf.serviceImpl.LoginServiceImpl;

/**
 * Servlet implementation class Login
 */
public class LoginController extends HttpServlet {
    private static final long serialVersionUID = 1L;

    private ApplicationContext context;

    private LoginServiceImpl loginServiceImpl;

    private volatile int count = 0;

    public LoginController() {}

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("----------get---------------");
    }

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

    @Override
    public void init() throws ServletException {
        context = WebApplicationContextUtils.getWebApplicationContext(this.getServletContext());
        loginServiceImpl = (LoginServiceImpl)context.getBean("loginServiceImpl");

    }

}

注意init方法中的配置。