Servlet（五岁以下儿童）web.xml一些常用的配置

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mb5fd86a050ef28 2015-10-25 12:19:00

（1）lode-on-startup，这Servlet该项目启动时它将被称为（从主要的电话init办法，为了安全起见，一般不应为Servlet建立URL制图）。一些数据通常被用作前处理，或使用多线程建立经常性的任务

<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>  <lode-on-startup>1</lode-on-startup> </servlet>

（2）init-param，可用做Servlet的一些配置信息

<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>

能够在FirstServlet的do*方法中使用this.getServletConfig().getInitParameter("encoding");获取web.xml中encoding值utf-8

2.1 多个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>

能够在FirstServlet的do*方法中

Enumeration<String> names = this.getServletConfig().getInitParameterNames();
      while(names.hasMoreElements()){
        //name为每一个init-param名字
        String name=names.nextElement();
      }

（3）context-param。全局配置信息。可在多个Servlet中使用

<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>