自定义 spring mvc 拦截器(近期项目需求实现)

需求背景：特定文件夹下任何文件不经过登录，全部拦截强制跳转登录，并客户端禁止下载服务器定制文件夹文件

经过1天多时间的各种尝试，自定义式的强大拦截器实现了，废话不说了，直接贴代码啦。

demo：

1> 根目录下 index.html 内容：

<a href="html/index.html">index</a><br/>

<a href="html/login3.html">login3.html---</a><br/>

<a href="html/xxx.xx">xxx.xx---</a><br/>

<a href="html/1.jpg">1.jpg---</a><br/>

<a href="html/1.src">1.src---</a><br/>

<a href="html/1.zip">1.zip---</a><br/>

。。。。。任何写啦

2> dispatcher-servlet.xml

<?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:mvc="http://www.springframework.org/schema/mvc"

xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context"

xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"

xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<!--

使Spring支持自动检测组件，如注解的Controller

-->

<context:component-scan base-package="com.yjde.web.controller" /><!--

<bean

class="org.springframework.web.servlet.view.InternalResourceViewResolver"

p:prefix="/html/" p:suffix=".html" />

--><!--<bean

class="org.springframework.web.servlet.view.InternalResourceViewResolver"

p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" />

-->

<mvc:interceptors>

<mvc:interceptor>

<!--设置拦截的路径:具体路径的拦截-->

<!--<mvc:mapping path="/*.*" />

<mvc:mapping path="/login1.do" />

<mvc:mapping path="/login2.do" />-->

<mvc:mapping path="/*.*" />

<bean class="com.yjde.web.interceptor.TimeInterceptor">

<!--openingTime 属性指定上班时间-->

<property name="openingTime">

<value>12</value>

</property>

<!--closingTime属性指定下班时间-->

<property name="closingTime">

<value>14</value>

</property>

<!--outsideOfficeHoursPage属性指定提示页面的URL-->

<property name="outsideOfficeHoursPage">

<value>http://localhost:8080/SpringMVCInterceptor/login/login.html

</value>

</property>

</bean>

</mvc:interceptor>

</mvc:interceptors><!--

<bean id="messageSource"

class="org.springframework.context.support.ResourceBundleMessageSource"

p:basename="message" />

--></beans>

3> web.xml

<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<welcome-file-list>

<welcome-file>index.html</welcome-file>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

<servlet>

<servlet-name>dispatcher</servlet-name>

<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

<init-param>

<param-name>contextConfigLocation</param-name>

<param-value>/WEB-INF/spring-mvc/*.xml</param-value>

</init-param>

<load-on-startup>1</load-on-startup>

</servlet>

<servlet-mapping>

<servlet-name>dispatcher</servlet-name>

<url-pattern>/html/*</url-pattern>

</servlet-mapping>

<servlet-mapping>

<servlet-name>dispatcher</servlet-name>

<url-pattern>*.do</url-pattern>

</servlet-mapping>

<!--处理从页面传递中文到后台而出现的中文乱码问题-->

<filter>

<filter-name>encodingFilter</filter-name>

<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

<init-param>

<param-name>encoding</param-name>

<param-value>UTF-8</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>encodingFilter</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

</web-app>

4> java 源码：

package com.yjde.web.interceptor;

import java.util.Calendar;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;

import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

public class TimeInterceptor extends HandlerInterceptorAdapter {

// 继承HandlerInterceptorAdapter类

private int openingTime; // openingTime 属性指定上班时间

private int closingTime; // closingTime属性指定下班时间

private String outsideOfficeHoursPage;// outsideOfficeHoursPage属性指定错误提示页面的URL

// 重写 preHandle()方法，在业务处理器处理请求之前对该请求进行拦截处理

public boolean preHandle(HttpServletRequest request,

HttpServletResponse response, Object handler) throws Exception {

Calendar cal = Calendar.getInstance();

System.out.println(">>"+request.getRequestURL());

System.out.println(request.getRequestURI());

int hour = cal.get(Calendar.HOUR_OF_DAY); // 获取当前时间

if (openingTime <= hour && hour < closingTime) { // 判断当前是否处于工作时间段内

return true;

} else {

response.sendRedirect(outsideOfficeHoursPage); // 返回提示页面

return false;

}

}

public void postHandle(HttpServletRequest request,

HttpServletResponse response, Object o, ModelAndView mav)

throws Exception {

System.out.println("postHandle");

}

public void afterCompletion(HttpServletRequest request,

HttpServletResponse response, Object o, Exception excptn)

throws Exception {

System.out.println("afterCompletion");

}

public int getOpeningTime() {

return openingTime;

}

public void setOpeningTime(int openingTime) {

this.openingTime = openingTime;

}

public int getClosingTime() {

return closingTime;

}

public void setClosingTime(int closingTime) {

this.closingTime = closingTime;

}

public String getOutsideOfficeHoursPage() {

return outsideOfficeHoursPage;

}

public void setOutsideOfficeHoursPage(String outsideOfficeHoursPage) {

this.outsideOfficeHoursPage = outsideOfficeHoursPage;

}

}

// 可以看出，上面的代码重载了preHandle()方法，该方法在业务处理器处理请求之前被调用。在该方法中，首先获得当前的时间，判断其是否在

// openingTime和closingTime之间，如果在，返回true，这样才会调用业务控制器去处理该请求；否则直接转向一个静态页面，返回

// false，这样该请求就不会被处理。

5>java源码：

package com.yjde.web.controller;

import java.io.PrintWriter;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RequestParam;

@Controller

public class LoginController {

@RequestMapping(value="/{username}", method = RequestMethod.GET)

public String html(@PathVariable("username") String username,HttpServletRequest request) {

System.out.println("拦截成功："+username);

return username;

}

}