ServletConfig对象

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Web.xml配置文件：

<servlet>    <servlet-name>ServletDemo5</servlet-name>    <servlet-class>cn.itcast.ServletDemo5</servlet-class>  <init-param>  <param-name>data1</param-name>  <param-value>xxxxx</param-value>  </init-param>  <init-param>  <param-name>data2</param-name>  <param-value>yyyyy</param-value>  </init-param>  <init-param>  <param-name>data3</param-name>  <param-value>zzzzz</param-value>  </init-param>    <init-param>  <param-name>charset</param-name>  <param-value>UTF-8</param-value>  </init-param>    <init-param>  <param-name>url</param-name>  <param-value>jdbc:mysql://localhost:3306/test</param-value>  </init-param>  <init-param>  <param-name>username</param-name>  <param-value>root</param-value>  </init-param>  <init-param>  <param-name>password</param-name>  <param-value>root</param-value>  </init-param>    <init-param>  <param-name>config</param-name>  <param-value>/struts-config.xml</param-value>  </init-param>  </servlet>

Servlet代码：

//servletConfig对象，用于封装servlet配置信息//在实际开发中，有一些东西不适合在servlet程序中写死，这类数据就可以通过配置方式配给servlet，例如//servlet采用哪个码表，servlet连接哪个数据库，servlet采用哪个配置文件public class ServletDemo5 extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//得到指定的参数String value = this.getServletConfig().getInitParameter("data1");System.out.println(value);//得到所有的参数Enumeration e = this.getServletConfig().getInitParameterNames();while(e.hasMoreElements()){String name = (String)e.nextElement();String value1 = this.getServletConfig().getInitParameter(name);System.out.println(name+"="+value1);}}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}