在映射請求中添加一個攔截器,自定義攔截器必須實現org.springframework.web.servlet.HandlerInterceptor接口。
HandlerInterceptor的示例代碼如下：
public interface HandlerInterceptor
{
   //在處理器執行前調用
boolean preHandle(HttpServletRequest request, HttpServletResponse response,   Object handler) throws Exception;

   //在處理器執行后調用
void postHandle(HttpServletRequest request, HttpServletResponse response,   Object handler,   ModelAndView modelAndView ) throws Exception;
   //在整個請求處理完后調用
void afterCompletion(HttpServletRequest request, HttpServletResponse response,   Object handler,   Exception    ex) throws Exception;
}
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文件NotLeaveWord.java
package dgut.ke.interceptor;

import java.util.Calendar;

import javax.servlet.RequestDispatcher;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

public class NotLeaveWord extends HandlerInterceptorAdapter
{
 private int startTime;
 private int endTime;
 private String interceptorPage;
  
 /*通過依賴注入*/
 public void setStartTime(int startTime) {
  this.startTime = startTime;
 }
 public void setEndTime(int endTime) {
  this.endTime = endTime;
 }
 public void setInterceptorPage(String interceptorPage) {
  this.interceptorPage = interceptorPage;
 }
 public int getStartTime() {
  return startTime;
 }
 public int getEndTime() {
  return endTime;
 }
 public String getInterceptorPage() {
  return interceptorPage;
 }
 /*進行攔截處理*/
 public boolean preHandle(HttpServletRequest request,
       HttpServletResponse response,
       Object handler)throws Exception
 {
  Calendar cal = Calendar.getInstance();
  int hour = cal.get(java.util.Calendar.HOUR_OF_DAY);
  if( hour > startTime && hour < endTime)
  {
   request.setAttribute("startTime", this.getStartTime());
   request.setAttribute("endTime", this.getEndTime());
   RequestDispatcher rd = request.getRequestDispatcher(this.getInterceptorPage());
   rd.forward(request, response);
   return false;
  }
  else
  {
   return true ;
  } 
 }
 
}
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