Filter中注入spring

       当我们用Filter时，往往需要使用一些辅助的service，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 JudgeUserRole implements Filter {

	private UserRelationService userRelationService;

	public UserRelationService getUserRelationService() {
		return userRelationService;
	}
	public void setUserRelationService(UserRelationService userRelationService) {
		this.userRelationService = userRelationService;
	}

	@Override
	public void destroy() {
	}

	@Override
	public void doFilter(ServletRequest arg0, ServletResponse arg1,
			FilterChain arg2) throws IOException, ServletException {
	
	 
         UserRelationship user = this.userRelationService.checkRelationship(0, "jnduan", 0, "cscs01");

        }
	@Override
	public void init(FilterConfig config) throws ServletException {

	 	ServletContext context = config.getServletContext();
		ApplicationContext ctx = WebApplicationContextUtils.getWebApplicationContext(context);
		userRelationService = (UserRelationService) ctx.getBean("userRelationService");
		
	}

}

   ps: userRelationService为在spring-application中配置的

评论

3 楼 soft_xiang 2015-04-25  

kentkwan 写道

public class MyFilter implements Filter, ApplicationContextAware {
	
	private AccountManager accountManager;

	@Override
	@PostConstruct
	public void init(FilterConfig filterConfig) throws ServletException {
		// TODO Auto-generated method stub

	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub

	}

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

	}

	@Override
	public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
		accountManager = applicationContext.getBean(AccountManager.class);
	}

}

你在瞎扯，ApplicationAwaried难道不是spring管理的，filter里面都还没有spring管理的东西

2 楼 kentkwan 2013-08-02  

public class MyFilter implements Filter, ApplicationContextAware {
	
	private AccountManager accountManager;

	@Override
	@PostConstruct
	public void init(FilterConfig filterConfig) throws ServletException {
		// TODO Auto-generated method stub

	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub

	}

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

	}

	@Override
	public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
		accountManager = applicationContext.getBean(AccountManager.class);
	}

}

1 楼 kentkwan 2013-08-02  

善用 @postConstructor 和 ApplicationAwaried接口