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