浅谈springMVC拦截器和过滤器总结

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：

<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
            ">

  <!--编写拦截器-->
  <mvc:interceptors>
    <!--对特定的url拦截-->
    <mvc:interceptor>
      <mvc:mapping path="/test.do"/>
      <bean class="com.hbut.interceptor.TestInterceptor"/>
    </mvc:interceptor>
    <mvc:interceptor>
      <!--对特定的模块拦截第一级别拦截-->
      <mvc:mapping path="/test/×/"/>
      <bean class="com.hbut.interceptor.TestInterceptor1"/>
    </mvc:interceptor>

    <mvc:interceptor>
      <!--对特定的模块拦截-->
      <mvc:mapping path="/test/×"/>
      <bean class="com.hbut.interceptor.TestInterceptor2"/>
    </mvc:interceptor>

  </mvc:interceptors>

对所有的url进行拦截

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

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

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