在web.xml的<servlet>标签中增添

<init-param>

　　<param-name>XXX</param-name>

　　<param-value>XXX</param-value>

</init-param>

public void init() throws ServletException {
　　// Put your code here
　　this.setUsername(this.getInitParameter("username"));
　　this.setPassword(this.getInitParameter("password"));
}

servlet_获取初始化参数