对于三大框架，例如ssh或ssm，在Tomcat容器启动时配置文件加载顺序是？
针对这样的疑问，我大概知道每个项目的加载都是从web.xml开始的，所以我们以下面的配置文件为例，说明加载过程，我的项目web.xml配置文件如下：
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns=""
xmlns:xsi=""
xsi:schemaLocation="
">
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>/WEB-INF/classes/log4j.properties</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>
<!-- 户登录安全filter -->
<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>
<!-- 添加CAS filter begin -->
<!-- 填写退出的URL -->
<context-param>
<param-name>casServerLogoutUrl</param-name>
<param-value>https://cass.cdv.com:8443/cas/logout</param-value>
</context-param>
<context-param>
<param-name>serverName</param-name>
<param-value>:8080</param-value>
</context-param>
<context-param>
<param-name>casServerLoginUrl</param-name>
<param-value>https://cass.cdv.com:8443/cas/login</param-value>
</context-param>
<listener>
<listener-class>org.jasig.cas.client.session.SingleSignOutHttpSessionListener</listener-class>
</listener>
<!-- CAS sign out -->
<filter>
<filter-name>CAS Single Sign Out Filter</filter-name>
<!-- the class to cometrue Filter Interface -->
<filter-class>org.jasig.cas.client.session.SingleSignOutFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CAS Single Sign Out Filter</filter-name>
<!-- the webpage to filter -->
<url-pattern>/*</url-pattern>
</filter-mapping>
<!--单点退出配置-->
<!-- CAS login首次登陆拦截跳转登陆页面 -->
<filter>
<filter-name>CAS Filter</filter-name>
<filter-class>org.jasig.cas.client.authentication.AuthenticationFilter</filter-class>
<!-- 初始化filter,默认的设置. -->
<init-param>
<param-name>casServerLoginUrl</param-name>
<!-- 统一认证服务器地址 -->
<param-value>https://cass.cdv.com:8443/cas/login</param-value>
</init-param>
<init-param>
<param-name>serverName</param-name>
<!-- 项目所在的服务器地址和端口号,认证服务器回调的URL-->
<param-value>:8080</param-value>
</init-param>
</filter>
<!-- 过滤哪些网站 -->
<filter-mapping>
<filter-name>CAS Filter</filter-name>
<!-- 项目中所要拦截的url -->
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- CAS Validation Filter 再次验证ticket-->
<filter>
<filter-name>CAS Validation Filter</filter-name>
<filter-class>
org.jasig.cas.client.validation.Cas20ProxyReceivingTicketValidationFilter</filter-class>
<!-- 初始化Filter,默认设置. -->
<init-param>
<param-name>casServerUrlPrefix</param-name>
<param-value>https://cass.cdv.com:8443/cas</param-value>
</init-param>
<init-param>
<param-name>serverName</param-name>
<!-- 验证成功转到的地址 -->
<param-value>:8080</param-value>
</init-param>
</filter>
<!-- 过滤所有的网页 -->
<filter-mapping>
<filter-name>CAS Validation Filter</filter-name>
<!-- 项目中所要拦截的url -->
<url-pattern>/*</url-pattern>
</filter-mapping>
<listener>
<listener-class>com.cdv.vms.web.listener.SessionListener</listener-class>
</listener>
<!-- 添加CAS filter end -->
<!-- 添加security filter 控制菜单的显示和隐藏 begin -->
<filter>
<description>login security filter</description>
<display-name>SecurityFilter</display-name>
<filter-name>SecurityFilter</filter-name>
<filter-class>com.cdv.ms.web.filter.SecurityFilter</filter-class>
<!-- 不需要过滤则直接转到主界面 /user/toMain/-->
<init-param>
<param-name>noFilter</param-name>
<param-value>main.jsp</param-value>
</init-param>
<init-param>
<param-name>noFilter1</param-name>
<param-value>/publish/showV/</param-value>
</init-param>
</filter>
<!-- 过滤内容 -->
<filter-mapping>
<filter-name>SecurityFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 添加security filter end -->
<servlet>
<servlet-name>springMVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springMVC.xml,classpath:applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springMVC</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- upload start -->
<servlet>
<servlet-name>TokenServlet</servlet-name>
<servlet-class>com.cdv.upload.servlet.TokenServlet</servlet-class>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>TokenServlet</servlet-name>
<url-pattern>/tk</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>StreamServlet</servlet-name>
<servlet-class>com.cdv.upload.servlet.StreamServlet</servlet-class>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>StreamServlet</servlet-name>
<url-pattern>/upload</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>FormDataServlet</servlet-name>
<servlet-class>com.cdv.upload.servlet.FormDataServlet</servlet-class>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>FormDataServlet</servlet-name>
<url-pattern>/fd</url-pattern>
</servlet-mapping>
<!-- upload end -->
<error-page>
<error-code>404</error-code>
<location>/common/404.jsp</location>
</error-page>
<error-page>
<error-code>505</error-code>
<location>/common/505.jsp</location>
</error-page>
<!-- welcome main.jsp -->
<welcome-file-list>
<welcome-file>main.jsp</welcome-file>
</welcome-file-list>
</web-app>
Tomcat容器加载
一、加载顺序