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一般情况下，对来自浏览器的请求的拦截，是利用Filter实现的，这种方式可以实现Bean预处理、后处理。 

Spring为我们提供了org.springframework.web.servlet.handler.HandlerInterceptorAdapter这个适配器，继承此类，可以非常方便的实现自己的拦截器。他有三个方法：

一般情况下，对来自浏览器的请求的拦截，是利用Filter实现的，这种方式可以实现Bean预处理、后处理。 Spring MVC的拦截器不仅可实现Filter的所有功能，还可以更精确的控制拦截精度。 Spring为我们提供了org.springframework.web.servlet.handler.HandlerInterceptorAdapter这个适配器，继承此类，可以非常方便的实现自己的拦截器。他有三个方法：

public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)            throws Exception {            return true;        }        public void postHandle(                HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)                throws Exception {        }        public void afterCompletion(                HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)                throws Exception {        }

分别实现预处理、后处理（调用了Service并返回ModelAndView，但未进行页面渲染）、返回处理（已经渲染了页面） 

public class TimeBasedAccessInterceptor extends HandlerInterceptorAdapter {        private int openingTime;        private int closingTime;        private String mappingURL;//利用正则映射到需要拦截的路径        public void setOpeningTime(int openingTime) {            this.openingTime = openingTime;        }        public void setClosingTime(int closingTime) {            this.closingTime = closingTime;        }        public void setMappingURL(String mappingURL) {            this.mappingURL = mappingURL;        }        @Override        public boolean preHandle(HttpServletRequest request,                HttpServletResponse response, Object handler) throws Exception {            String url=request.getRequestURL().toString();            if(mappingURL==null || url.matches(mappingURL)){                Calendar c=Calendar.getInstance();                c.setTime(new Date());                int now=c.get(Calendar.HOUR_OF_DAY);                if(now
   
    closingTime){                    request.setAttribute("msg", "注册开放时间：9：00-12：00");                    request.getRequestDispatcher("/msg.jsp").forward(request, response);                    return false;                }                return true;            }            return true;        }    }
   

xml配置：

UserController：

@Controller    @RequestMapping("/user.do")    public class UserController{        @Autowired        private UserService userService;        @RequestMapping(params="action=reg")        public ModelAndView reg(Users user) throws Exception {            userService.addUser(user);            return new ModelAndView("profile","user",user);        }        // other option ...    }

这个Controller相当于Struts的DispatchAction 

我们项目里面的例子

package com.shishuo.studio.filter;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Component;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import com.shishuo.studio.entity.User;import com.shishuo.studio.exception.CookieNotFoundException;import com.shishuo.studio.service.UserService;import com.shishuo.studio.util.CookieUtils;/** * @author Herbert 拦截器的实现 */@Componentpublic class AuthInterceptor implements HandlerInterceptor {	@Autowired	private UserService userService;	public void afterCompletion(HttpServletRequest request,			HttpServletResponse respone, Object object, Exception exception)			throws Exception {		// TODO Auto-generated method stub	}	public void postHandle(HttpServletRequest request,			HttpServletResponse response, Object object,			ModelAndView modelAndView) throws Exception {	}	public boolean preHandle(HttpServletRequest request,			HttpServletResponse response, Object handler) throws Exception {		try {			User user = userService.getUserById(request);			if (userService.checkAuth(user, request, response)) {				return true;			} else {				response.sendRedirect("/user/login.htm");				return false;			}		} catch (Exception e) {			e.printStackTrace();		}		response.sendRedirect("/user/login.htm");		return false;	}}

package com.shishuo.studio.filter;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Component;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import com.shishuo.studio.service.CategoryService;/** * @author Herbert *  */@Componentpublic class GlobalInterceptor implements HandlerInterceptor {	@Autowired	private CategoryService categoryService;	@Override	public boolean preHandle(HttpServletRequest request,			HttpServletResponse response, Object handler) throws Exception {		return true;	}	@Override	public void postHandle(HttpServletRequest request,			HttpServletResponse response, Object handler,			ModelAndView modelAndView) throws Exception {		if (null == modelAndView) {			return;		}		// 系统配置参数		modelAndView.addObject("categoryList",				categoryService.getCategoryListOfDisplayByFatherId(0));	}	@Override	public void afterCompletion(HttpServletRequest request,			HttpServletResponse response, Object handler, Exception ex)			throws Exception {		// TODO Auto-generated method stub	}}

package com.shishuo.studio.filter;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Component;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import com.shishuo.studio.entity.User;import com.shishuo.studio.entity.vo.StudioVo;import com.shishuo.studio.exception.StudioNotFoundException;import com.shishuo.studio.service.StudioService;import com.shishuo.studio.service.UserService;/** * @author Herbert *  */@Componentpublic class StudioInterceptor implements HandlerInterceptor {	@Autowired	private StudioService studioService;	@Autowired	private UserService userService;	@Override	public boolean preHandle(HttpServletRequest request,			HttpServletResponse response, Object handler) throws Exception {		User user = userService.getUserById(request);		try {			StudioVo studio = studioService.getStudioById(user.getUserId());			return true;		} catch (StudioNotFoundException e) {			response.sendRedirect("/auth/teacher/studio.htm");			return false;		}	}	@Override	public void postHandle(HttpServletRequest request,			HttpServletResponse response, Object handler,			ModelAndView modelAndView) throws Exception {	}	@Override	public void afterCompletion(HttpServletRequest request,			HttpServletResponse response, Object handler, Exception ex)			throws Exception {	}}

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