FIlter里面怎么注入Service

我们知道Filter是无法注入Service的，这是由于顺序是监听器—》过滤器-----》servlet
我们的service实体化后是交给spring管理的所以无法所以过滤器这个时候初始化，Service还没有初始化

这里我是要把一个redisTemplte注入到shiroFIlter里面去
记录下代码
public class ShiroLoginFilter extends UserFilter{

private String sessionId;
private RedisTemplate redisTemplate;

@Override
protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) {
	// TODO Auto-generated method stub
	if (redisTemplate == null) {
	    redisTemplate = (RedisTemplate) ShiroSpringUtils.getBean("redisTemplate");
	}
	Subject subject = getSubject(request, response);
	boolean authenticated = subject.isAuthenticated();
	if (subject.isAuthenticated()) {
		User user =(User) (subject.getPrincipal());
		String userID = user.getUserID();
		sessionId = redisTemplate.opsForValue().get(userID).toString();
		if("0".equals(sessionId)) {
			return false;
		}
}
	return super.isAccessAllowed(request, response, mappedValue);
}

@Override
protected boolean onAccessDenied(ServletRequest request,ServletResponse response) throws Exception {
	HttpServletRequest req= (HttpServletRequest) request;
    HttpServletResponse httpServletResponse = (HttpServletResponse) response;
    if("0".equals(sessionId)) {
    	Subject subject = SecurityUtils.getSubject();
        subject.logout();
        //httpServletResponse.sendRedirect("/login.html");
    }
    if(isAjax(req)){//如果是ajax请求返回状态码
    	 httpServletResponse.setCharacterEncoding("UTF-8");
         httpServletResponse.setContentType("application/json");
         httpServletResponse.getWriter().write(JSONObject.toJSON(ApiResponse.ofMsg(403,"您还未登录，重新登录")).toString());
         httpServletResponse.setStatus(HttpServletResponse.SC_FORBIDDEN);
    }else{
    	/**
         * @Mark 非ajax请求重定向为登录页面
         */
    	 httpServletResponse.sendRedirect("/login.html");
    }
    return false;
}

public boolean isAjax(HttpServletRequest request){  
    String header = request.getHeader("X-Requested-With");  
    boolean isAjax = "XMLHttpRequest".equalsIgnoreCase(header) ? true:false;  
    return isAjax;  
}

}
这里我们来看下这个类

package com.crsri.config;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
/**
*

• 做一个fiter可以注入service的工具类
  */
  @Component
  public class ShiroSpringUtils implements ApplicationContextAware {

  private static ApplicationContext applicationContext;

  @Override
  public void setApplicationContext(ApplicationContext applicationContext)
  throws BeansException {
  if (ShiroSpringUtils.applicationContext == null) {
  ShiroSpringUtils.applicationContext = applicationContext;
  }
  }

  public static ApplicationContext getApplicationContext() {
  return applicationContext;
  }

  //根据name
  public static Object getBean(String name) {
  return getApplicationContext().getBean(name);
  }

  //根据类型
  public static T getBean(Class clazz) {
  return getApplicationContext().getBean(clazz);
  }

  public static T getBean(String name, Class clazz) {
  return getApplicationContext().getBean(name, clazz);
  }
  }