ServletContext1

最新推荐文章于 2024-11-06 01:05:47 发布

weixin_30607659

最新推荐文章于 2024-11-06 01:05:47 发布

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原文链接：http://www.cnblogs.com/daimazhang/p/5364988.html

本文介绍了一个简单的Servlet示例，展示了如何通过ServletConfig对象读取web.xml中定义的初始化参数，并将其输出到客户端。

---------------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> ; ");
   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>