SpringMVC拦截器具体有哪些应用场景？

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java拦截器类定义：package org.tlgg.interceptor;

import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.HandlerInterceptor;

public class Interceptor implements HandlerInterceptor { // 拦截器方法}

---------拦截器 package org.tlgg.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("最后执行，通常用于释放资源"); } @Override public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3) throws Exception { System.out.println("在controller处理完，生成视图之前"); } @Override public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2) throws Exception { System.out.println("在请求controller之前，return true表示放行，false表示拦截"); return true; } } -------spring.xml配置