📄 contextservlet.java
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package com;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ContextServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public ContextServlet() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
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.print("date is -- " + date +"<br>");
out.print("age is -- " + myclass +"<br>");
//集合方法
java.util.Enumeration e=context.getInitParameterNames();
while(e.hasMoreElements())
{
String pName=(String)e.nextElement();
String pValue=context.getInitParameter(pName);
out.print("<br><b>"+pName+"</b> ");
out.print("------ " + pValue);
}
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the POST method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occure
*/
public void init() throws ServletException {
// Put your code here
}
}
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