以下內容摘取自網路，其中有部分沒說清楚，這邊加以說明

通常做法是定義一個Servlet，並在web.xml中配置Servlet的啟動順序<load-on-startup>的值在DispatcherServlet之後。但這樣做的缺點是在Servlet中無法使用Spring的依賴注入功能，只能使用WebApplicationContext的getBean()方法獲取bean。

找到的解決辦法如下：

1、自定義一個用於代理啟動Servlet的類DelegatingServletProxy：

package cn.edu.swu.oa.common.util;

import java.io.IOException;

import javax.servlet.GenericServlet;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

public class DelegatingServletProxy extends GenericServlet {

	private String targetBean;
	private Servlet proxy;

	@Override
	public void service(ServletRequest arg0, ServletResponse arg1)
			throws ServletException, IOException {
		proxy.service(arg0, arg1);
	}

	@Override
	public void init() throws ServletException {
		this.targetBean = getServletName();
		getServletBean();
		proxy.init(getServletConfig());
	}

	private void getServletBean() {
		WebApplicationContext wac = WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());
		this.proxy = (Servlet)wac.getBean(targetBean);
	}

}
 

package com.gszh.wmcp.project.distribution.servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import com.gszh.wmcp.project.distribution.service.TestQueryService;

@Component("InitParamServlet")
public class InitParamServlet extends HttpServlet {
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	/**
	 * Tomcat伺服器啟動時馬上執行ServerMain.start(),啟動相關執行緒
	 */
	@Autowired
	private TestQueryService queryAction;

	@Override  
    public void init() throws ServletException {  
        super.init();
        Start();
        
    } 
	//開始啟動
	public void Start(){
		queryAction.query();
	}
	
}
 

  <servlet-mapping>
    <servlet-name>wap</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  
  <servlet>
    <servlet-name>InitParamServlet</servlet-name>
    <servlet-class>com.gszh.wmcp.project.distribution.unit.DelegatingServletProxy</servlet-class>
    <load-on-startup>5</load-on-startup>
  </servlet>