初学servlet之@WebServlet传参

发布时间：2023-09-06 01:11责任编辑：顾先生关键词：Web

package app01a;

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

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebInitParam;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

//传入两个初始参数
@WebServlet(name = "ServletConfigDemoServlet",
       urlPatterns = { "/servletConfigDemo" },
       initParams = {
               @WebInitParam( name = "admin", value = " Harry Taciak"),
               @WebInitParam( name = "email", value = " admin@example.com")
       })
public class ServletConfigDemoServlet extends HttpServlet {
   private static final long serialVersionUID = 1L;
   private transient ServletConfig servletConfig;

   /**
   * 返回servletConfig
   */
   @Override
   public ServletConfig getServletConfig() {
       return servletConfig;
   }

   /**
   * 首先执行,在一次访问中从始至终只执行一次
   */
   @Override
   public void init(ServletConfig servletConfig) throws ServletException {
       this.servletConfig = servletConfig;
   }

   /**
    * 第二执行,每次请求时都要执行
    */
   @Override
   protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       ServletConfig servletConfig = getServletConfig();
       String admin = servletConfig.getInitParameter("admin");
       String email = servletConfig.getInitParameter("email");
       response.setContentType("text/html");
       PrintWriter writer = response.getWriter();
       writer.print("<html><head></head><body>" + "Admin:" + admin + "<br/>Email:" + email +
               "</body></html>");
   }

   /**
    * 返回Servlet描述
    */
   @Override
   public String getServletInfo() {
       return "ServletConfig demo";
   }

   /**
    * 摧毁时调用
    */
   @Override
   public void destroy() {
       // TODO Auto-generated method stub
       super.destroy();
   }
}

原文地址：http://www.cnblogs.com/wadmwz/p/7521491.html

初学servlet之@WebServlet传参

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