package 
import javax.servlet.*;
import javax.servlet.http.*;
import *;
public class HelloServlet extends HttpServlet {
    
    //Initialize global variables
  
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
    }
    
    //Process the HTTP Get request
  
    public void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
        response.setContentType("text/html;charset=GB2312");
        PrintWriter out = response.getWriter();
        
        out.println("<html>");
        out.println("<head><title>CH2 - HelloServlet</title></head>");
        out.println("<body>");
        out.println(" Hello World <br>");
        out.println("大家好");
        out.println("</body>");
        out.println("</html>");
        out.close();
    } 
    
    //Get Servlet information 
    public String getServletInfo() {
        return " Information";
    }
}
初学照着书上的方法运行的!还是不好用!