<mvc:interceptors>
		<mvc:interceptor>
			<mvc:mapping path="/**" />
			<bean class="pers.river.interceptor.LogInterceptor"></bean>
		</mvc:interceptor>
</mvc:interceptors>

public class LogInterceptor implements HandlerInterceptor {

	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object arg2, Exception arg3)
			throws Exception {
		// TODO Auto-generated method stub
		System.out.println("afterCompletion");
		Date date = new Date();
		SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd :hh:mm:ss");
		Log log = new Log();
		log.setLoginTime(dateFormat.format(date).toString());
		log.setName(request.getSession().getAttribute("username").toString());
		log.setId(Integer.parseInt(request.getSession().getAttribute("id").toString()));
		LogDaoImpl dao = new LogDaoImpl();
		System.out.println(log.getName() + log.getId());
		dao.insertLog(log);
	}

	@Override
	public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
			throws Exception {
		// TODO Auto-generated method stub
		System.out.println("postHandle");
	}

	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object arg2) throws Exception {
		// TODO Auto-generated method stub
		System.out.println("preHandle");
		return true;
	}

}

@Controller
@RequestMapping("/admin")
public class UserController {
	UserService service = new UserServiceImpl();
	// 全浏览
	@RequestMapping("/looklist.action")
	public String look(HttpServletRequest request, HttpServletResponse response) {
		HttpSession session = request.getSession();
		Integer grade = Integer.parseInt(session.getAttribute("grade")
				.toString());
		String user = (String) session.getAttribute("username");
		if (grade > 2) {
			ArrayList<User_reg> looklist = service.findAllService();
			request.setAttribute("lookList", looklist);
		} else {
			ArrayList<User_reg> looklist = service.findUserService(user);
			request.setAttribute("lookList", looklist);
		}
		return "look";
	}
	// 删除
	@RequestMapping("/delete.action")
	public String del(Integer id) {
		service.delService(id);
		return "redirect:looklist.action";
	}
	// 批量删除
	@RequestMapping("/delSelecte.action")
	public String delSelect(Integer[] ids) {
		if (ids != null) {
			for (Integer id : ids) {
				service.delService(id);
			}
		}
		return "redirect:looklist.action";
	}
	// 通过ID找到指定要修改的用户
	@RequestMapping("/findUser.action")
	public String findUser(HttpServletRequest request,
			HttpServletResponse response, Integer id) {
		User_reg user = service.findUserById(id);
		request.setAttribute("user", user);
		return "modify";
	}
	// 提交修改的用户信息
	@RequestMapping(value="/modify.action")
	public void modify(HttpServletRequest request,
			HttpServletResponse response, PrintWriter out, User_reg user) {
		DateUtil today = new DateUtil();
		String reg_time = today.getDate();
		String reg_ip = request.getRemoteAddr();
		User_reg u = service.getService(user.getId());
		u.setPw(user.getPw());
		u.setAge(user.getAge());
		u.setEmail(user.getEmail());
		u.setReg_time(reg_time);
		u.setReg_ip(reg_ip);
		service.modifyService(u);
		out.print("修改成功！3秒后自动跳转浏览数据。");
		response.setHeader("refresh", "3; URL=looklist.action");
	}
	// 指定后台管理页面首页
	@RequestMapping("welcome.action")
	public String welcome() {
		return "welcome";
	}
}

这里登陆后控制台没有显示拦截器的信息，为什么没有拦截到/admin/welcome.action