springmvc拦截器

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在使用框架的时候大多时候我们是不需要自己定义拦截器的，但是有时候我们需要进行权限的控制，那么就需要自己去写拦截器

1.拦截器类

package com.qbd.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class Intercepter implements HandlerInterceptor {

   /*
   * 负责清理工作
   * */
   public void afterCompletion(HttpServletRequest arg0,
           HttpServletResponse arg1, Object arg2, Exception arg3)
           throws Exception {

       // TODO Auto-generated method stub

   }
/*、
* 处理后
* */
   public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,
           Object arg2, ModelAndView arg3) throws Exception {
       System.out.println("处理后——————————————");
       // TODO Auto-generated method stub

   }

   /*
   * 处理前
   * */
   public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1,
           Object arg2) throws Exception {
       // TODO Auto-generated method stub
       System.out.println("处理前——————————————");
       return true;/*返回true继续向下执行，返回false则不向下执行*/
   }

}

2.mvc.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<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.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">
       
       <context:component-scan base-package="com.qbd.controller"></context:component-scan>
       
       <mvc:interceptors>
           <mvc:interceptor>
           
               <mvc:mapping path="/**"/>
               <bean class="com.qbd.controller.Intercepter"></bean>
           </mvc:interceptor>
       </mvc:interceptors>
</beans>

3.测试程序

package com.qbd.controller;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.stereotype.Controller;

@Controller
public class HController {

   @RequestMapping("/hello")
   public String name() {
       System.out.println("****");
       return "index.jsp";
   }
}

4.控制台的输出结果为

处理前——————————————

**************

处理后——————————————

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