可以通過ServletActionContext.getServletContext()獲得serletContext物件。

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
  <context-param> 
<param-name>mysqldriver</param-name> 
<param-value>com.mysql.jdbc.Driver</param-value> 
  </context-param> 
  <context-param> 
<param-name>mysqlurl</param-name> 
<param-value>jdbc:mysql://127.0.0.1:3306/food_manage</param-value> 
  </context-param> 
  <context-param> 
<param-name>mysqluser</param-name> 
<param-value>root</param-value> 
  </context-param> 
  <context-param> 
<param-name>mysqlpwd</param-name> 
<param-value>123456</param-value> 
  </context-param> 
  
  
  <welcome-file-list>
    <welcome-file>login.jsp</welcome-file>
  </welcome-file-list>
  <filter>
    <filter-name>struts2</filter-name>
    <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

public static final String URL = ServletActionContext.getServletContext().getInitParameter("mysqlurl");
public static final String USERNAME = ServletActionContext.getServletContext().getInitParameter("mysqlurl");
public static final String PASSWORD = ServletActionContext.getServletContext().getInitParameter("mysqlpwd");