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《Servlet与JSP核心编程第二版》阅读记录005-servlet执行顺序

2015-08-27 14:08 661 查看

Servlet 生命周期中常用几个方法的执行顺序

1 init() servlet启动时执行一次

2 service() 每次请求时执行

3 doGet() doPost() 在service()执行之后

4 coreservlets.HelloServlet2.java增加调试日志后代码如下：

package coreservlets;

import java.io.*;

import javax.servlet.*;

import javax.servlet.http.*;

import org.apache.log4j.Logger;

public class HelloServlet2 extends HttpServlet {

   private static Logger log = Logger.getLogger(HelloServlet2.class);


@Override

   public void init() throws ServletException {



      log.info("HelloServlet2.init()..........");

   }

@Override

   protected void service(HttpServletRequest req, HttpServletResponse resp)

           throws ServletException, IOException {



      log.info("HelloServlet2.service()..........");

       super.service(req, resp);

   }

public void doGet(HttpServletRequest request,HttpServletResponse response)

      throws ServletException, IOException

{

   log.info("HelloServlet2.doGet()..........");



    response.setContentType("text/html");

    PrintWriter out = response.getWriter();

    String docType =

      "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " +

      "Transitional//EN\">\n";

    out.println(docType +

                "<HTML>\n" +

                "<HEAD><TITLE>Hello (2)</TITLE></HEAD>\n" +

                "<BODY BGCOLOR=\"#FDF5E6\">\n" +

                "<H1>Hello coreservlets.HelloServlet2 cuigh</H1>\n" +

               new java.util.Date() +

                "</BODY></HTML>");

}

}

5 日志输出如下：

2015-08-27 14:02:45,532 [HelloServlet2.java 15] INFO -
HelloServlet2.init()..........

2015-08-27 14:02:45,532 [HelloServlet2.java 22] INFO - HelloServlet2.service()..........

2015-08-27 14:02:45,532 [HelloServlet2.java 29] INFO - HelloServlet2.doGet()..........

2015-08-27 14:04:44,752 [HelloServlet2.java 22] INFO - HelloServlet2.service()..........

2015-08-27 14:04:44,752 [HelloServlet2.java 29] INFO - HelloServlet2.doGet()..........

2015-08-27 14:05:19,096 [HelloServlet2.java 22] INFO - HelloServlet2.service()..........

2015-08-27 14:05:19,112 [HelloServlet2.java 29] INFO - HelloServlet2.doGet()..........

2015-08-27 14:05:41,440 [HelloServlet2.java 22] INFO - HelloServlet2.service()..........

2015-08-27 14:05:41,456 [HelloServlet2.java 29] INFO - HelloServlet2.doGet()..........

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