servlet web.xml 中初始化参数的使用

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
   
  <context-param>
      <param-name>Encoding2</param-name>
      <param-value>GBK</param-value>
  </context-param>

  <servlet>
    <servlet-name>Test</servlet-name>
    <servlet-class>day01.Test</servlet-class>
      <init-param>
        <param-name>Encoding</param-name>
        <param-value>UTF8</param-value>
      </init-param>
      <load-on-startup>1</load-on-startup>
  </servlet>
 
 
 
  <servlet-mapping>
    <servlet-name>Test</servlet-name>
    <url-pattern>/test</url-pattern>
  </servlet-mapping>

  <welcome-file-list>
    <welcome-file>login.html</welcome-file>
  </welcome-file-list>
</web-app>
在servlet中获取的方式：
1\
<servlet>
  <init-param>
      <param-name>Encoding</param-name>
      <param-value>UTF8</param-value>
  </init-param>
</servlet>
this.getServletConfig().getInitParameter("Encoding");
2\
<context-param>
      <param-name>Encoding</param-name>
      <param-value>UTF8</param-value>
</context-param>
this.getServletContext().getInitParammeter("Encoding");