------------ContextServlet.java--------------节选--
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();
ServletContext context = getServletConfig().getServletContext();
//获得工程相关信息
out.println("获得了工程的相对路径："+context.getRealPath("/")+"<br>");
out.println("获取了Tomcat的信息: "+context.getServerInfo()+"<br>");
out.println("获取了JNDI："+context.getResource("/")+"<br>");
out.println("获取了源程序的相对路径："+context.getResourcePaths("/")+"<br>");
//getInitParameter方法
String date = context.getInitParameter("date");
String myclass = context.getInitParameter("class");
out.println("date is -- "+date+"<br>");
out.println("class is -- "+myclass+"<br>");
//集合方法
Enumeration e = context.getInitParameterNames();
while(e.hasMoreElements()){
String pName=(String) e.nextElement();
String pValue=context.getInitParameter(pName);
out.println("<br><b>"+pName+"</b> ");
out.println("----- "+pValue+"<br>");
}
}
-------------------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>test4-03</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>
<context-param>
<param-name>date</param-name>
<param-value>200</param-value>
</context-param>
<context-param>
<param-name>class</param-name>
<param-value>102</param-value>
</context-param>
<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>ContextServlet</servlet-name>
<servlet-class>com.ContextServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>ContextServlet</servlet-name>
<url-pattern>/servlet/ContextServlet</url-pattern>
</servlet-mapping>
</web-app>