springMVC 拦截器使用介绍

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);
	}

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