ServletContext1

---------------ConfigServlet.java-----------

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  // TODO Auto-generated method stub
  request.setCharacterEncoding("GB2312");
  response.setContentType("text/html;charset=gb2312");
  PrintWriter out = response.getWriter();
  ServletConfig config = getServletConfig();
  //getInitParameter方法
  String username = config.getInitParameter("username");
  String password = config.getInitParameter("password");
  out.print("username--"+username);
  out.print("password--"+password);
  //集合方法
  Enumeration<?> e = config.getInitParameterNames();
  while(e.hasMoreElements()){
   String pusername=(String) e.nextElement();
   String ppassword = config.getInitParameter(pusername);
   out.print("<br/><b>"+pusername+"</b>&nbsp;;&nbsp;");
   out.print("------"+ppassword);
  }
  out.close();
 }

----------------------web.xml----------------

<?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_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>ServletConfig</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>ConfigServlet</servlet-name>
    <servlet-class>com.ConfigServlet</servlet-class>
    <init-param>
     <param-name>username</param-name>
     <param-value>jspuser</param-value>
    </init-param>
    <init-param>
     <param-name>password</param-name>
     <param-value>123456</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
   <servlet-name>ConfigServlet</servlet-name>
   <url-pattern>/servlet/ConfigServlet</url-pattern>
  </servlet-mapping>
</web-app>