一般情況下，對來自瀏覽器的請求的攔截，是利用Filter實現的，這種方式可以實現Bean預處理、后處理。?
Spring MVC的攔截器不僅可實現Filter的所有功能，還可以更精確的控制攔截精度。?

Spring為我們提供了org.springframework.web.servlet.handler.HandlerInterceptorAdapter這個適配器，繼承此類，可以非常方便的實現自己的攔截器。他有三個方法：

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一般情況下，對來自瀏覽器的請求的攔截，是利用Filter實現的，這種方式可以實現Bean預處理、后處理。 Spring MVC的攔截器不僅可實現Filter的所有功能，還可以更精確的控制攔截精度。 Spring為我們提供了org.springframework.web.servlet.handler.HandlerInterceptorAdapter這個適配器，繼承此類，可以非常方便的實現自己的攔截器。他有三個方法：

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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 { }

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分別實現預處理、后處理（調用了Service并返回ModelAndView，但未進行頁面渲染）、返回處理（已經渲染了頁面）?
在preHandle中，可以進行編碼、安全控制等處理；?
在postHandle中，有機會修改ModelAndView；?
在afterCompletion中，可以根據ex是否為null判斷是否發生了異常，進行日志記錄。?

如果基于xml配置使用Spring MVC，
可以利用SimpleUrlHandlerMapping、BeanNameUrlHandlerMapping進行Url映射（相當于struts的path映射）和攔截請求（注入interceptors），
如果基于注解使用Spring MVC，可以使用DefaultAnnotationHandlerMapping注入interceptors。
注意無論基于xml還是基于注解，HandlerMapping bean都是需要在xml中配置的。?

一個demo：?
在這個例子中，我們假設UserController中的注冊操作只在9：00-12：00開放，那么就可以使用攔截器實現這個功能。?

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public class TimeBasedAccessInterceptor extends HandlerInterceptorAdapter { private int openingTime; private int closingTime; private String mappingURL;//利用正則映射到需要攔截的路徑 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<openingTime || now>closingTime){ request.setAttribute("msg", "注冊開放時間：9：00-12：00"); request.getRequestDispatcher("/msg.jsp").forward(request, response); return false; } return true; } return true; } }

xml配置：

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<bean id="timeBasedAccessInterceptor" class="com.spring.handler.TimeBasedAccessInterceptor"> <property name="openingTime" value="9" /> <property name="closingTime" value="12" /> <property name="mappingURL" value=".*/user\.do\?action=reg.*" /> </bean> <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"> <property name="interceptors"> <list> <ref bean="timeBasedAccessInterceptor"/> </list> </property> </bean>

這里我們定義了一個mappingURL屬性，實現利用正則表達式對url進行匹配，從而更細粒度的進行攔截。當然如果不定義mappingURL，則默認攔截所有對Controller的請求。?

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UserController：

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@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 ... }

這個Controller相當于Struts的DispatchAction?

你也可以配置多個攔截器，每個攔截器進行不同的分工.?

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我們項目里面的例子

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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 攔截器的實現*/ @Component public class AuthInterceptor implements HandlerInterceptor {@Autowiredprivate 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;} }

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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* */ @Component public class GlobalInterceptor implements HandlerInterceptor {@Autowiredprivate CategoryService categoryService;@Overridepublic boolean preHandle(HttpServletRequest request,HttpServletResponse response, Object handler) throws Exception {return true;}@Overridepublic void postHandle(HttpServletRequest request,HttpServletResponse response, Object handler,ModelAndView modelAndView) throws Exception {if (null == modelAndView) {return;}// 系統配置參數modelAndView.addObject("categoryList",categoryService.getCategoryListOfDisplayByFatherId(0));}@Overridepublic void afterCompletion(HttpServletRequest request,HttpServletResponse response, Object handler, Exception ex)throws Exception {// TODO Auto-generated method stub}}

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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* */ @Component public class StudioInterceptor implements HandlerInterceptor {@Autowiredprivate StudioService studioService;@Autowiredprivate UserService userService;@Overridepublic 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;}}@Overridepublic void postHandle(HttpServletRequest request,HttpServletResponse response, Object handler,ModelAndView modelAndView) throws Exception {}@Overridepublic void afterCompletion(HttpServletRequest request,HttpServletResponse response, Object handler, Exception ex)throws Exception {} }

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