在doFilter方法中无法注入set方法 解决办法

今天在使用doFilter时，测试了十几次就是无法获取newsService对象，总是报newsService为null, 经过网上查询相关资料之后发现在普通的java中，只要声明（set,get方法）后在spring-application配置文件中配置就可以了，但是由于Filter与Listener需要配置在web.xml文件中，所以它们的对象是由容器创建的。通常在Spring的application-context.xml配置文件中编写的bean由Spring负责创建，所以直接在Spring配置文件配置过滤器与监听器是无法达到注入目的的。

可以使用如下方法，例：

public class ValidateWeixinController extends BaseController implements Filter {

private NewsService newsService;

private InfoService infoService;

private StadiumService stadiumService;

public NewsService getNewsService() {

return newsService;

}

public void setNewsService(NewsService newsService) {

this.newsService = newsService;

}

public InfoService getInfoService() {

return infoService;

}

public void setInfoService(InfoService infoService) {

this.infoService = infoService;

}

public StadiumService getStadiumService() {

return stadiumService;

}

public void setStadiumService(StadiumService stadiumService) {

this.stadiumService = stadiumService;

}

@Override

public void init(FilterConfig config) throws ServletException {

System.out.println("ValidateWeixinController启动成功！");

ServletContext context = config.getServletContext();

ApplicationContext ac = WebApplicationContextUtils.getWebApplicationContext(context);

newsService = (NewsService) ac.getBean("newsService");

infoService = (InfoService) ac.getBean("infoService");

stadiumService = (StadiumService) ac.getBean("stadiumService");

}

......

}