评:
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:

Java代码 收藏代码

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