1、在web.xml文件中配置上下文参数

1 
      2   
      3   
     
       4       
       5       
      
       One
      
       6       
      
       hello
      
       7   
      8   
     
       9       
      
       Two
      10       
      
       dyf
      11   
     

 

2、在servlet中获取上下文参数

1 //@WebServlet(name="HelloServlet01",value="/Hello") 2 @WebServlet(name="HelloServlet01",urlPatterns="/Hello") 3 public class HelloServlet01 extends HttpServlet { 4     private static final long serialVersionUID = 1L; 5  6     public void doGet(HttpServletRequest request, HttpServletResponse response) 7             throws ServletException, IOException { 8         this.doPost(request, response); 9         10     }11 12     public void doPost(HttpServletRequest request, HttpServletResponse response)13             throws ServletException, IOException {14         //创建一个获取上下文参数的对象15         ServletContext context = this.getServletContext();16         //获取上下文初始化的参数17         String initParameter = context.getInitParameter("One");18 //        context.getInitParameterNames();19         PrintWriter writer = response.getWriter();20         //将参数返回到页面21         writer.append(initParameter);22     }23 }