springMVC 拦截器

package com.zf.inteceptor;

import java.util.Iterator;
import java.util.Map;

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

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

@Component("MyInteceptor")
public class MyInteceptor extends HandlerInterceptorAdapter{

//该方法是在进入control之前会执行
@Override
public boolean preHandle(HttpServletRequest request,
HttpServletResponse response, Object handler) throws Exception {
System.out.println("preHandle......................");
String requestUrl = request.getRequestURI();
if (requestUrl.matches(".+goIndex.do.*")) {     //可以用这种方式对某个action进行拦截 ,如果不这样 默认就是对所有control都拦截
if(request.getSession().getAttribute("loginUser") == null){
request.getRequestDispatcher("/login.jsp").forward(request , response);
}
}
return super.preHandle(request, response, handler);}
//该方法是在执行完control之后再执行
@Override
public void postHandle(HttpServletRequest request,
HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {

System.out.println("postHandle......................");
Map model = modelAndView.getModel();	//这里可以遍历执行完control之后，control方法返回的ModelAndView对象，并且可以修改里面的内容
for (Iterator it = model.entrySet().iterator(); it.hasNext() ;) {
System.out.println(it.next() + "\t\t-----------------------------------");;
}
super.postHandle(request, response, handler, modelAndView);
}