Servlet (v) Some of the common configuration of Web. xml

(1) Lode-on-startup, the servlet will be called at the start of the project (primarily called the Init method, for security sake, generally should not establish a URL mapping for the servlet), generally used as preprocessing some data, or with multithreading to establish timed tasks

    <servlet><pre name= "code" class= "HTML" ><span style= "font-family:arial, Helvetica, Sans-serif;" >               </span><span style= "FONT-FAMILY:SIMSUN;FONT-SIZE:12PX;" > <servlet-name>FirstServlet</servlet-name></span>

<servlet-class>com.hunhun.FirstServlet</servlet-class> <!--1 represents the start order of multiple preprocessed servlets--< Lode-on-startup>1</lode-on-startup> </servlet>

(2) Init-param, can be used to do some configuration information of the servlet

    <servlet>        <servlet-name>FirstServlet</servlet-name>        <servlet-class> com.hunhun.firstservlet</servlet-class>        <init-param>          <param-name>encoding</ param-name>          <param-value>utf-8</param-value>        </init-param>    </servlet>

You can use This.getservletconfig (). Getinitparameter ("encoding") in the do* method of Firstservlet; Get encoding value in Web. XML utf-8

More than 2.1 Init-param

    <servlet>        <servlet-name>FirstServlet</servlet-name>        <servlet-class> com.hunhun.firstservlet</servlet-class>        <init-param>          <param-name>encoding</ param-name>          <param-value>utf-8</param-value>        </init-param>        <init-param>          <param-name>author</param-name>          <param-value>hunhun</param-value>        </ init-param>        <init-param>          <param-name>versioon</param-name>          <param-value >1.0</param-value>        </init-param>    </servlet>

Can be in the do* method of Firstservlet

enumeration<string> names = This.getservletconfig (). Getinitparameternames ();      while (Names.hasmoreelements ()) {      //name for each init-param name      String name=names.nextelement ();      }

(3) Context-param, global configuration information, can be used in multiple servlets

    <servlet>        <servlet-name>FirstServlet</servlet-name>        <servlet-class> com.hunhun.firstservlet</servlet-class>        <init-param>          <param-name>encoding</ param-name>          <param-value>utf-8</param-value>        </init-param>        <init-param>          <param-name>author</param-name>          <param-value>hunhun</param-value>        </ init-param>        <init-param>          <param-name>versioon</param-name>          <param-value >1.0</param-value>        </init-param>    </servlet>    <context-param>          <param-name>date</param-name>          <param-value>2011-12-3 10:30:24</param-value>    </context-param>

You can use string date = This.getservletcontext () in the do* method of *servlet. Getinitparameter ("date"); Get to date

Servlet (v) Some of the common configuration of Web. xml