拦截器： 用来对访问的url进行拦截处理

用处： 权限验证，乱码设置等

spring-mvc.xml文件中的配置：

对所有的url进行拦截

java代码

package com.hbut.interceptor;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * @Author XiJun.Gong * @DATE 2016/6/1. * aim:   com.hbut.interceptor */public class TestInterceptor implements HandlerInterceptor {    @Override    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {             //todo 在此处添加要操作code        System.out.println("preHandle");         return true;  //todo 此处为false时，请求不会到达control层    }    @Override    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {        System.out.println("postHandle");  //todo 可以用来修改信息，跳转等    }    @Override    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {        System.out.println("afterCompletion"); //todo 最后执行    }}

另一种拦截器：大同小异

package com.hbut.interceptor;import org.springframework.ui.ModelMap;import org.springframework.web.context.request.WebRequest;import org.springframework.web.context.request.WebRequestInterceptor;/** * @Author XiJun.Gong * @DATE 2016/6/1. * aim:   com.hbut.interceptor */public class Test2Interceptor implements WebRequestInterceptor {    @Override    public void preHandle(WebRequest webRequest) throws Exception {    }    @Override    public void postHandle(WebRequest webRequest, ModelMap modelMap) throws Exception {    }    @Override    public void afterCompletion(WebRequest webRequest, Exception e) throws Exception {    }}

过滤器： 依赖于servlet容器，使用回调函数，过滤范围大

拦截器： 依赖于框架容器 比如spring、mybatis ，灵活