------------ContextServlet.java--------------節選--

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();
??//獲得工程相關信息
??out.println("獲得了工程的相對路徑："+context.getRealPath("/")+"<br>");
??out.println("獲取了Tomcat的信息: "+context.getServerInfo()+"<br>");
??out.println("獲取了JNDI："+context.getResource("/")+"<br>");
??out.println("獲取了源程序的相對路徑："+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>&nbsp;");
???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>

轉載于:https://www.cnblogs.com/daimazhang/p/5364994.html

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