springboot整合filter之在filter中如何获取spring容器中的bean对象

本人在项目使用的是springboot，具业务需要本人使用了filter过滤器，进行一个路径拦截，本人配置的是拦截所有/*,然后对路径中包含的特有字段进行处理。

filter中需要使用service的bean对象，我使用@Autowired注解注入对象，然后启动，访问时报空指针异常，filter中获取不到bean对象。

后面我发现spring容器初始化bean对象的顺序是listener-->filter-->servlet,之后代码示范

package com.server.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import com.server.module.system.adminUser.AdminConstant;
import com.server.module.system.adminUser.AdminUserBean;
import com.server.module.system.adminUser.AdminUserService;
import com.server.module.system.adminUser.AdminUserServiceImp;
import com.server.module.system.logsManager.exportLog.ExportLogBean;
import com.server.module.system.logsManager.exportLog.ExportLogService;
import com.server.util.ReturnDataUtil;

public class ExportFilter implements Filter{
	public static Logger log = LogManager.getLogger(WebFilter.class);
	@Autowired
	private AdminUserService adminUserService;
	@Autowired
	private ExportLogService exportLogServiceImpl;
	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
        //初始化filter时手动注入bean对象
		ServletContext context = filterConfig.getServletContext(); 
		ApplicationContext ac = WebApplicationContextUtils .getWebApplicationContext(context); 
		adminUserService = ac.getBean(AdminUserService.class); 
		exportLogServiceImpl=ac.getBean(ExportLogService.class);
		
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		log.info("===========================start");
		//只对导出做调整
		HttpServletRequest req=(HttpServletRequest) request;
		//对请求路径进行拦截
		boolean falg=req.getRequestURI().contains("export")||req.getRequestURI().contains("Export");
		if(req.getRequestURI().contains("exportLog")) {//不进行处理
			falg=false;
		}
		ExportLogBean bean=new ExportLogBean();
		if(falg) {
		//对bean的数据进行封装
		Long userId = (Long) req.getAttribute(AdminConstant.LOGIN_USER_ID);
		ReturnDataUtil data = adminUserService.findUserById(userId);
		AdminUserBean loginUser = (AdminUserBean)data.getReturnObject();
		bean.setOperator(userId);//设置导出人
		bean.setOperatorName(loginUser.getName());//设置导出人姓名
		bean.setCompanyId((long)loginUser.getCompanyId());//设置导出人公司
		req.setAttribute("exportBean", bean);
		}
		chain.doFilter(req, response);//放行
		if(falg) {
		//对数据进行处理
		exportLogServiceImpl.add(bean);
		}
		log.info("===========================end");
	}

	@Override
	public void destroy() {
		// TODO Auto-generated method stub
		
	}
	
}

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