web.xml 各個標籤詳解
對於web專案，web.xml可有，也可以沒有。但是對於大型的web專案使用web.xml會很方便的。
1.web.xml是專案的入口
2.web.xml可以做的事：
- 指定歡迎頁面
- 指定錯誤頁面、
- 命名與定製url
- 定製初始化引數
- 設定過濾器
- .設定監聽器
- 設定session過期時間
1<?xml version="1.0" encoding="UTF-8"?>
宣告xml的版本
2<web-app>
指明xml使用的是哪個模式檔案（即xsd，就是描述xml的規範）
3<display-name>
設定站點的標題顯示內容
4<session-config>
設定使用者登入的session時間
5<welcome-file-list>
設定訪問站點專案名顯示的歡迎頁面，第一個不存在就顯示第二個。第一個存在第二個就會不起作用。
6<servlet>
指定訪問的所有路徑都經過TestServlet.do處理器。
7<context-param />
用來設定web站臺的環境引數，引數也可以xml檔案。即載入各種配置檔案。
8 <listener>
設定監聽器
9<filter>
設定過濾器。
10<error-page>
指定錯誤的頁面，可以通過“異常型別”或“錯誤碼”來指定錯誤處理頁面。
<?xml version="1.0" encoding="UTF-8"?>
<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">
<display-name>CLNContract</display-name>
<!-- session週期30分鐘失效 -->
<session-config>
<session-timeout>30</session-timeout>
</session-config>
<!-- session週期30分鐘失效 -->
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
<welcome-file>index1.jsp</welcome-file>
</welcome-file-list>
<servlet>
<error-page>
<exception-type>java.lang.Exception<exception-type>
<location>/exception.jsp<location>
</error-page>
<error-page>
<exception-type>java.lang.NullException</exception-type>
<location>/error.jsp</location>
</error-page>
<error-page>
<error-code>404</error-code>
<location>/error404.jsp</location>
</error-page>
<servlet-name>servlet1</servlet-name>
<servlet-class>com.TestServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>servlet1</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
classpath*:applicationContext*.xml
</param-value>
</context-param>
<filter>
<filter-name>systemFilter</filter-name>
<filter-class>com.chinalife.util.UrlFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>systemFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<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>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter>
<filter-name>struts-cleanup</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ActionContextCleanUp
</filter-class>
</filter>
<!--
<filter>
<filter-name>loginAndStrutsFilter</filter-name>
<filter-class>com.chinalife.common.web.filter.LoginAndStrutsFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>loginAndStrutsFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
-->
<!-- <filter> <filter-name>loginAndStrutsFilter</filter-name>
<filter-class>com.chinalife.common.web.filter.LoginAndStrutsFilter</filter-class>
</filter> <filter-mapping>
<filter-name>loginAndStrutsFilter</filter-name>
<url-pattern>/*</url-pattern> </filter-mapping> -->
<!-- struts 2.3.15.1 Config begin -->
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
<dispatcher>FORWARD</dispatcher>
<dispatcher>REQUEST</dispatcher>
</filter-mapping>
<!-- Spring 3.2.4.RELEASE -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<listener>
<listener-class>com.chinalife.common.web.filter.SpringInit</listener-class>
</listener>
<listener>
<listener-class>com.chinalife.contract.userPermissionQuery.utils.NFDFlightDataTaskListener</listener-class>
</listener>
<filter>
<filter-name>OpenSessionInView</filter-name>
<filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
<init-param>
<param-name>singleSession</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>flushMode</param-name>
<param-value>AUTO</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>OpenSessionInView</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping><!--
<filter>
<filter-name>urlFilter</filter-name>
<filter-class>com.chinalife.common.web.filter.UrlFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>urlFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
--><servlet>
<servlet-name>XFireServlet</servlet-name>
<servlet-class>
org.codehaus.xfire.spring.XFireSpringServlet
</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>services.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>XFireServlet</servlet-name>
<url-pattern>/service/*</url-pattern>
</servlet-mapping>
<jsp-config>
<taglib>
<taglib-uri>/WEB-INF/ecside.tld</taglib-uri>
<taglib-location>/WEB-INF/ecside.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/user-defined-tags</taglib-uri>
<taglib-location>/common/tlds/user-defined-tags.tld</taglib-location>
</taglib>
</jsp-config>
<welcome-file-list>
<welcome-file>login.jsp</welcome-file>
</welcome-file-list>
<mime-mapping>
<extension>xls</extension>
<mime-type>application/msexcel</mime-type>
</mime-mapping>
<mime-mapping>
<extension>txt</extension>
<mime-type>applcation/txt</mime-type>
</mime-mapping>
</web-app>