攔截器： 用來對訪問的url進行攔截處理

用處： 權限驗證，亂碼設置等

spring-mvc.xml文件中的配置：

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc
 
="http://www.springframework.org/schema/mvc"
              xsi:schemaLocation="http://www.springframework.org/schema/beans
                        http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
                        http://www.springframework.org/schema/context
                        http://www.springframework.org/schema/context/spring-context-3.1.xsd
                        http://www.springframework.org/schema/mvc
                        http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
                        http://www.springframework.org/schema/tx
                        "
 
>

<!--編寫攔截器-->
<mvc:interceptors>
    <!--對特定的url攔截-->
    <mvc:interceptor>
         <mvc:mapping path="/test.do"/>
         <bean class="com.hbut.interceptor.TestInterceptor"/>
    </mvc:interceptor>
    <mvc:interceptor>
          <!--對特定的模塊攔截第一級別攔截
 
-->
          <mvc:mapping path="/test/×/"/>
          <bean class="com.hbut.interceptor.TestInterceptor1"/>
     </mvc:interceptor>         
　　　<mvc:interceptor>
          <!--對特定的模塊攔截-->
          <mvc:mapping path="/test/×"/>
          <bean class="com.hbut.interceptor.TestInterceptor2"/>
     </mvc:interceptor> 
</mvc:interceptors>

對所有的url進行攔截

<mvc:interceptors>
    <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor"/>
</mvc:interceptors>

java代碼

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 在此處添加要操作code        System.out.println("preHandle"); 
        return true;  //todo 此處為false時，請求不會到達control層
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle");  //todo 可以用來修改信息，跳轉等
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        System.out.println("afterCompletion"); //todo 最後執行
    }
}

另一種攔截器：大同小異

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 {

    }
}

過濾器： 依賴於servlet容器，使用回調函數，過濾範圍大

攔截器： 依賴於框架容器 比如spring、mybatis ，靈活

springMVC攔截器和過濾器總結