filterconfig java Web 启动时自动执行代码的几种方式(2)

<filter>  
    <filter-name>InitFilter</filter-name>  
    <filter-class>com.test.init.InitFilter</filter-class>  
</filter>  
<filter-mapping>  
    <filter-name>InitFilter</filter-name>  
    <url-pattern>/</url-pattern>  
</filter-mapping>

3.编写一个Servlet,在web.xml里面配置容器启动后执行即可

public class InitServlet extends HttpServlet {  

    /**  
     */  
    private static final long serialVersionUID = 1L;  

    @Override  
    public void init(ServletConfig config) {  
        try {  
            super.init();  
        } catch (ServletException e) {  
            e.printStackTrace();  
        }  
        System.out.println("================>[Servlet]自动加载启动开始.");  
        // 读取Spring容器中的Bean[此时Bean已加载,可以使用]  
        //执行想要的代码  
        System.out.println("================>[Servlet]自动加载启动结束.");  
    }  
}

然后在web.xml文件配置该Servlet的启动方式为：容器启动后执行

<servlet>  
    <servlet-name>InitServlet</servlet-name>  
    <servlet-class>com.test.init.InitServlet</servlet-class>  
    <init-param>  
        <param-name>username</param-name>  
        <param-value>test</param-value>  
    </init-param>  
            <!-- 此处指定加载顺序为2,表明还有优先级更高的Servlet要先执行 -->  
    <load-on-startup>2</load-on-startup>  
</servlet>  
<servlet-mapping>  
    <servlet-name>InitServlet</servlet-name>  
    <url-pattern>/</url-pattern>  
</servlet-mapping>

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