张家港早晨网站建设,网页模板库,小贷做网站,深圳外贸公司有哪些一般情况下#xff0c;对来自浏览器的请求的拦截#xff0c;是利用Filter实现的#xff0c;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#xff0c;还可以更精确的控制拦截精度。
Spring为我们提供了org.springframework.web.s…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 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 在preHandle中可以进行编码、安全控制等处理 在postHandle中有机会修改ModelAndView 在afterCompletion中可以根据ex是否为null判断是否发生了异常进行日志记录。 如果基于xml配置使用Spring MVC可以利用SimpleUrlHandlerMapping、BeanNameUrlHandlerMapping进行Url映射相当于struts的path映射和拦截请求注入interceptors如果基于注解使用Spring MVC可以使用DefaultAnnotationHandlerMapping注入interceptors。注意无论基于xml还是基于注解HandlerMapping bean都是需要在xml中配置的。 一个demo 在这个例子中我们假设UserController中的注册操作只在900-1200开放那么就可以使用拦截器实现这个功能。 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 urlrequest.getRequestURL().toString(); if(mappingURLnull || url.matches(mappingURL)){ Calendar cCalendar.getInstance(); c.setTime(new Date()); int nowc.get(Calendar.HOUR_OF_DAY); if(nowopeningTime || nowclosingTime){ request.setAttribute(msg, 注册开放时间900-1200); request.getRequestDispatcher(/msg.jsp).forward(request, response); return false; } return true; } return true; }
}
xml配置 bean idtimeBasedAccessInterceptor classcom.spring.handler.TimeBasedAccessInterceptor property nameopeningTime value9 / property nameclosingTime value12 / property namemappingURL value.*/user\.do\?actionreg.* /
/bean
bean classorg.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping property nameinterceptors list ref beantimeBasedAccessInterceptor/ /list /property
/bean
这里我们定义了一个mappingURL属性实现利用正则表达式对url进行匹配从而更细粒度的进行拦截。当然如果不定义mappingURL则默认拦截所有对Controller的请求。 UserController Controller
RequestMapping(/user.do)
public class UserController{ Autowired private UserService userService; RequestMapping(paramsactionreg) 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 你也可以配置多个拦截器每个拦截器进行不同的分工. 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*/
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;}
}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;}// 系统配置参数modelAndView.addObject(categoryList,categoryService.getCategoryListOfDisplayByFatherId(0));}Overridepublic 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* */
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 {}
}
