Servlet初始配置 監聽器和過濾器
阿新 • • 發佈：2018-07-29
https cal 認證 缺省 Coding wrapper oot comm 是否
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ServletContext:application範圍內的參數
此所設定的參
來源： http://note.sdo.com/my數，在JSP網頁中可以使用下列方法來取得：
${initParam.param0},
<%=application.getInitParameter("param0") %><br/>
若在Servlet可以使用下列方法來獲得：
String param_name=getServletContext().getInitParameter("param0")
=this.getServletConfig().getServletContext().getInitParameter("param0")
=application.getInitParameter("param0");
使用上下文初始化參數:
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<context-param>
<param-name>param_name</param-name>
<param-value>avalible during application</param-value>
</context-param>
<context-param> <param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring-configuration/*.xml</param-value>
</context-param>
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部署在同一容器中的多個Web項目，要配置不同的webAppRootKey，web.xml文件中最好定義webAppRootKey參數，如果不定義，將會缺省為“webapp.root”
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<context-param>
<param-name>webAppRootKey</param-name>
<param-value> business.root </param-value>
</context-param>
<!—public-base應用路徑 -->
<context-param>
<param-name>webAppRootKey</param-name>
<param-value> pubbase.root</param-value>
</context-param>
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在web.xml中該Servlet的定義標記中，比如：
servlet範圍內的參數，只能在servlet的init()方法中取得(或者通過註解配置在對應的類上：@WebServlet("/MyServlet")
System.out.println(this.getInitParameter("param1")=this.getServletConfig().getInitParameter(name));
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<servlet>
<servlet-name>TimeServlet</servlet-name>
<servlet-class>com.allanlxf.servlet.basic.TimeServlet</servlet-class>
<init-param>
<param-name>param1</param-name>
<param-value>avalible in servlet init()</param-value>
</init-param>
<load-on-startup>0</load-on-startup>//標記容器是否在啟動的時候就加載這個servlet,執行init（）方法，初始化參數</servlet>
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配置監聽器：（啟動Web容器時，自動裝配ApplicationContext、log4j的配置信息。）
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<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring-configuration/*.xml</param-value>
</context-param>
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>WEB-INF/log4j.properties</param-value>
</context-param>
<context-param>
<param-name>log4jRefreshInterval</param-name>
<param-value>6000</param-value>
</context-param>
<!-- Spring的log4j監聽器 -->
<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- 與CAS Single Sign Out Filter配合，註銷登錄信息 -->
<listener>
<listener-class>com.yonyou.mcloud.cas.client.session.SingleSignOutHttpSessionListener</listener-class>
</listener>
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配置過濾器：
Filter可認為是Servle的一種“加強版”，主要用於對用戶請求request進行預處理，也可以對Response進行後處理，是個典型的處理鏈。使用Filter的完整流程是：Filter對用戶請求進行預處理，接著將請求HttpServletRequest交給Servlet進行處理並生成響應，最後Filter再對服務器響應HttpServletResponse進行後處理。Filter與Servlet具有完全相同的生命周期，且Filter也可以通過<init-param>來配置初始化參數，獲取Filter的初始化參數則使用FilterConfig的getInitParameter()。
換種說法，Servlet裏有request和response兩個對象，Filter能夠在一個request到達Servlet之前預處理request，也可以在離開Servlet時處理response，Filter其實是一個Servlet鏈。以下是Filter的一些常見應用場合，創建一個過濾器，實現Filter接口。重新init(), doFilter(), destroy().
註解的方式配置：@WebFilter(filterName="FirstFilter",urlPatterns={"/index.jsp"},initParams={WWebInitParam(name="mood",value="awake")})
urlPatterns:哪些URL可以過濾，默認“/*”
initParams: 初始化哪些參數。
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<!--****************************過濾器配置*********************************-->
<!-- 字符集過濾器 -->
<filter>
<filter-name>CharacterEncodingFilter</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>
<!-- 單點登出過濾器 -->
<filter>
<filter-name>CAS Single Sign Out Filter</filter-name>
<filter-class>com.yonyou.mcloud.cas.client.session.SingleSignOutFilter</filter-class>
</filter>
<!-- 認證過濾器 -->
<filter>
<filter-name>CAS Authentication Filter</filter-name>
<filter-class>com.yonyou.mcloud.cas.client.authentication.ExpandAuthenticationFilter</filter-class>
<init-param>
<param-name>casServerLoginUrl</param-name>
<param-value>https://dev.yonyou.com:443/sso-server/login</param-value>
</init-param>
<init-param>
<!--這裏的server是服務端的IP -->
<param-name>serverName</param-name>
<param-value>http://10.1.215.40:80</param-value>
</init-param>
</filter>
<!-- 驗證ST/PT過濾器 -->
<filter>
<filter-name>CAS Validation Filter</filter-name>
<filter-class>org.jasig.cas.client.validation.Cas20ProxyReceivingTicketValidationFilter</filter-class>
<init-param>
<param-name>casServerUrlPrefix</param-name>
<param-value>https://dev.yonyou.com:443/sso-server</param-value>
</init-param>
<init-param>
<param-name>serverName</param-name>
<param-value>http://10.1.215.40:80</param-value>
</init-param>
<init-param>
<param-name>proxyCallbackUrl</param-name>
<param-value>https://dev.yonyou.com:443/business/proxyCallback</param-value>
</init-param>
<init-param>
<param-name>proxyReceptorUrl</param-name>
<param-value>/proxyCallback</param-value>
</init-param>
<init-param>
<param-name>proxyGrantingTicketStorageClass</param-name>
<param-value>com.yonyou.mcloud.cas.client.proxy.MemcachedBackedProxyGrantingTicketStorageImpl</param-value>
</init-param>
<!-- 解決中文問題 -->
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter>
<filter-name>CAS HttpServletRequest Wrapper Filter</filter-name>
<filter-class>org.jasig.cas.client.util.HttpServletRequestWrapperFilter</filter-class>
</filter>
<filter>
<filter-name>CAS Assertion Thread Local Filter</filter-name>
<filter-class>org.jasig.cas.client.util.AssertionThreadLocalFilter</filter-class>
</filter>
<filter>
<filter-name>NoCache Filter</filter-name>
<filter-class>com.yonyou.mcloud.cas.client.authentication.NoCacheFilter</filter-class>
</filter>
<!--****************************映射關系配置********************************-->
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>NoCache Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>CAS Single Sign Out Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>CAS Validation Filter</filter-name>
<url-pattern>/proxyCallback</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>CAS Authentication Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>CAS Validation Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>CAS HttpServletRequest Wrapper Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>CAS Assertion Thread Local Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
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配置失效時間：
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<session-config>
<session-timeout>120</session-timeout>
</session-config>
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<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list></span>
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Servlet初始配置 監聽器和過濾器