Servlets (children under five) Web. XML some common configurations

(1) Lode-on-startup, this servlet when the project is started it will be called (from the main phone init method, for security reasons, the servlet should not generally establish a URL mapping). Some data is often used as a pre-processing or use multithreading to build recurring 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>

Ability to 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 used in the do* method of Firstservlet

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

(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>

The ability to use string date = This.getservletcontext () in the do* method of *servlet. Getinitparameter ("date"); get the latest

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Servlets (children under five) Web. XML some common configurations