spring设置拦截器代码实例

package com.zhiyou100.wyf.interceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
public class MyInterceptor implements HandlerInterceptor{
  @Override
  public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
      throws Exception {
    System.out.println("结束");
  }
  @Override
  public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
      throws Exception {    
    System.out.println("预备");    
  }
  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object arg2) throws Exception {
    Object name = request.getSession().getAttribute("name");
    if(name!=null) {
      return true;
    }else {
      response.sendRedirect("../denglu.jsp");
      return false;
    }
  }
}