Servlet初始配置 监听器和过滤器

ServletContext:application范围内的参数

此所设定的参

来源： http://note.sdo.com/my

数，在JSP网页中可以使用下列方法来取得：

 

${initParam.param0},

<%=application.getInitParameter("param0") %>

若在Servlet可以使用下列方法来获得：

String param_name=getServletContext().getInitParameter("param0")

=this.getServletConfig().getServletContext().getInitParameter("param0")

=application.getInitParameter("param0");

使用上下文初始化参数:

           param_name
           avalible during application


    contextConfigLocation
    /WEB-INF/spring-configuration/*.xml

 

 

  部署在同一容器中的多个Web项目，要配置不同的webAppRootKey，web.xml文件中最好定义webAppRootKey参数，如果不定义，将会缺省为“webapp.root”

    < context-param >
        < param-name >webAppRootKey param-name >
        < param-value > business.root param-value >
    context-param >

    < context-param >
        < param-name >webAppRootKey param-name >
        < param-value > pubbase.root param-value >
    context-param >

 

 

 在web.xml中该Servlet的定义标记中，比如：

servlet范围内的参数，只能在servlet的init()方法中取得(或者通过注解配置在对应的类上：@WebServlet("/MyServlet")

System.out.println(this.getInitParameter("param1")=this.getServletConfig().getInitParameter(name));

     TimeServlet
     class >com.allanlxf.servlet.basic.TimeServlet class >

        param1
        avalible in servlet init()

    0 //标记容器是否在启动的时候就加载这个servlet,执行init（）方法，初始化参数

 

配置监听器：（启动Web容器时，自动装配ApplicationContext、log4j的配置信息。）

< 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 >

< listener >
    < listener-class >org.springframework.web.util.Log4jConfigListener listener-class >
listener >
< listener >
    < listener-class >org.springframework.web.context.ContextLoaderListener listener-class >
listener >

< listener >
< listener-class >com.yonyou.mcloud.cas.client.session.SingleSignOutHttpSessionListener listener-class >
listener >

配置过滤器：

        Filter可认为是Servle的一种“加强版”，主要用于对用户请求request进行预处理，也可以对Response进行后处理，是个典型的处理链。使用Filter的完整流程是：Filter对用户请求进行预处理，接着将请求HttpServletRequest交给Servlet进行处理并生成响应，最后Filter再对服务器响应HttpServletResponse进行后处理。Filter与Servlet具有完全相同的生命周期，且Filter也可以通过来配置初始化参数，获取Filter的初始化参数则使用FilterConfig的getInitParameter()。

        换种说法，Servlet里有request和response两个对象，Filter能够在一个request到达Servlet之前预处理request，也可以在离开Servlet时处理response，Filter其实是一个Servlet链。以下是Filter的一些常见应用场合，创建一个过滤器，实现Filter接口。重新init(), doFilter(), destroy().

        注解的方式配置：@WebFilter(filterName="FirstFilter",urlPatterns={"/index.jsp"},initParams={WWebInitParam(name="mood",value="awake")})

        urlPatterns:哪些URL可以过滤，默认“/*”

        initParams: 初始化哪些参数。

  < 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 >

  < filter >
    < filter-name >CAS Single Sign Out Filter filter-name >
    < filter-class >com.yonyou.mcloud.cas.client.session.SingleSignOutFilter filter-class >
  filter >

  < 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 >

      < param-name >serverName param-name >
      < param-value >http://10.1.215.40:80 param-value >
    init-param >
  filter >

  < 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 >

    < 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 >

  < 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 >

 

 

配置失效时间：

< session-config >
   < session-timeout >120 session-timeout >
session-config >

< welcome-file-list >
    < welcome-file >index.html welcome-file >
welcome-file-list > span >

转载于:https://www.cnblogs.com/shuchen007/p/9385034.html