JSP 从配置文件获取参数详解_JSP编程_

package com.idv2.learnjsp; 

 import java.io.IOException; 
 import java.io.PrintWriter; 

 import javax.servlet.ServletConfig; 
 import javax.servlet.ServletContext; 
 import javax.servlet.ServletException; 
 import javax.servlet.http.HttpServletRequest; 
 import javax.servlet.http.HttpServletResponse; 

 /** 
  * Servlet implementation class for Servlet: InitParam 
  * 
  */
  public class InitParam extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet { 

     /** 
      * 自动生成的序列号 
      */
     private static final long serialVersionUID = 7732869603825506920L; 

     /** 
      * 程序名称 
      */
     private String appName; 

     /** 
      * 页面标题 
      */
     private String title; 

     public void init() { 

         // 获取参数 
         ServletConfig config = getServletConfig(); 
         ServletContext context = config.getServletContext(); 
         title = config.getInitParameter("title"); 
         appName = context.getInitParameter("appname"); 
     } 

     /* (non-Java-doc) 
      * @see javax.servlet.http.HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) 
      */
     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 

         response.setContentType("text/html; charset=UTF-8"); 

         PrintWriter out = response.getWriter(); 

         out.println(""); 
         out.println(""); 
         out.println(""); 
         out.println(""); 
         out.println(""); 
         out.println("Application name: " + appName); 
         out.println(""); 
         out.println(""); 
     } 
 }