ServletConfig对象

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1.ServletConfig对象和配置文件相关

* 配置初始化参数
* 需要在<servlet></servlet>标签下配置。
* 如果要是配置在某个servlet的标签下，那么只能在该servlet中获取初始化参数。

               <init-param>
                   <param-name>username</param-name>
                   <param-value>root</param-value>
               </init-param>

           * String getServletName()                     获取配置文件中servlet的名称
           * String getInitParameter(String name)     获取初始化参数

* Enumeration getInitParameterNames() 获取初始化参数的名称们

        <servlet>        <servlet-name>ServletDemo6</servlet-name>        <servlet-class>cn.itcast.servlet.ServletDemo6</servlet-class>        <init-param>    <param-name>username</param-name>    <param-value>root</param-value>        </init-param>        <init-param>    <param-name>password</param-name>    <param-value>123456</param-value>        </init-param>  </servlet> <servlet-mapping>        <servlet-name>ServletDemo6</servlet-name>        <url-pattern>/demo6</url-pattern>  </servlet-mapping>

package cn.itcast.servlet;import java.io.IOException;import javax.servlet.ServletConfig;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class ServletDemo6 extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//获取ServletConfig对象ServletConfig config = this.getServletConfig();String servletName = config.getServletName();String userName = config.getInitParameter("username");String passWord = config.getInitParameter("password");System.out.println(servletName);System.out.println(userName + " " + passWord);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}

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