欢迎页面：

 

　　代码详解：

　　web.xml配置文件：

1 
      2 
     
       7      8     
       9     
      12     13     
      17     18     
      
       19         
       
        system/welcome
       20     
      21     22     
      
       23         
       
        welcome
       24         
       
        com.bjpowernode.javaweb.servlet.WelcomeServlet
       25     
      26     
      
       27         
       
        welcome
       28         
       
        /system/welcome
       29     
      30     31 
     

　　WelcomeServlet：

1 package com.bjpowernode.javaweb.servlet; 2  3 import java.io.IOException; 4 import java.io.PrintWriter; 5  6 import javax.servlet.Servlet; 7 import javax.servlet.ServletConfig; 8 import javax.servlet.ServletException; 9 import javax.servlet.ServletRequest;10 import javax.servlet.ServletResponse;11 12 public class WelcomeServlet implements Servlet{13 14     @Override15     public void destroy() {16         17     }18 19     @Override20     public ServletConfig getServletConfig() {21         // TODO Auto-generated method stub22         return null;23     }24 25     @Override26     public String getServletInfo() {27         return null;28     }29 30     @Override31     public void init(ServletConfig arg0) throws ServletException {32         33     }34 35     @Override36     public void service(ServletRequest request, ServletResponse response) 37             throws ServletException, IOException {38         39         response.setContentType("text/html;charset=UTF-8");40         PrintWriter out = response.getWriter();41         42         out.print("                                ");43         out.print("                                   ");44         out.print("                   ");45         out.print("                                  ");46         out.print("                                   ");47         out.print("        这是Servlet,也可以作为欢迎页面
         ");48         out.print("                                  ");49         out.print("                               ");50         51     }52     53 }

 

HTTP状态码：