浅谈springMVC拦截器和过滤器总结

时间:2021-08-07 19:18:55

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:

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<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
            ">
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<!--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

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

java代码

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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

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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

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。

原文链接:http://www.cnblogs.com/gongxijun/p/5551542.html