Servlet生命周期测试代码 

  1 package com.dy.xidian;
  2 
  3 import java.io.IOException;
  4 import java.io.PrintWriter;
  5 
  6 import javax.servlet.ServletConfig;
  7 import javax.servlet.ServletException;
  8 import javax.servlet.annotation.WebInitParam;
  9 import javax.servlet.annotation.WebServlet;
 10 import javax.servlet.http.HttpServlet;
 11 import javax.servlet.http.HttpServletRequest;
 12 import javax.servlet.http.HttpServletResponse;
 13 
 14 @WebServlet(initParams = {@WebInitParam(name = "startPoint", value = "1600")}, name = "LifeServlet", value = "/show")
 15 public class LifeCycleServlet extends HttpServlet {
 16 
 17     private static double startPoint = 0;
 18     /**
 19      * Destruction of the servlet. <br>
 20      */
 21     public void destroy() {
 22         this.log("执行 destroy 方法...");
 23         super.destroy(); // Just puts "destroy" string in log
 24         // Put your code here
 25     }
 26 
 27     /**
 28      * The doGet method of the servlet. <br>
 29      * 
 30      * This method is called when a form has its tag value method equals to get.
 31      * 
 32      * @param request
 33      *            the request send by the client to the server
 34      * @param response
 35      *            the response send by the server to the client
 36      * @throws ServletException
 37      *             if an error occurred
 38      * @throws IOException
 39      *             if an error occurred
 40      */
 41     public void doGet(HttpServletRequest request, HttpServletResponse response)
 42             throws ServletException, IOException {
 43         this.log("执行 doGet 方法...");
 44         response.setCharacterEncoding("utf-8");
 45         response.setContentType("text/html");
 46         PrintWriter out = response.getWriter();
 47         out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
 48         out.println("<HTML>");
 49         out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
 50         out.println("  <BODY>");
 51         out.print("<form action='http://localhost/LifeCycleServlet/show' method='post'>");
 52         out.print("请输入数字:<input type='text' name='num'/><br>");
 53         out.print("<input type='submit' value='提交' />");
 54         out.print("</form>");
 55         out.println("  </BODY>");
 56         out.println("</HTML>");
 57         out.flush();
 58         out.close();
 59     }
 60 
 61     /**
 62      * The doPost method of the servlet. <br>
 63      * 
 64      * This method is called when a form has its tag value method equals to
 65      * post.
 66      * 
 67      * @param request
 68      *            the request send by the client to the server
 69      * @param response
 70      *            the response send by the server to the client
 71      * @throws ServletException
 72      *             if an error occurred
 73      * @throws IOException
 74      *             if an error occurred
 75      */
 76     public void doPost(HttpServletRequest request, HttpServletResponse response)
 77             throws ServletException, IOException {
 78         this.log("执行 doPost 方法...");
 79         response.setCharacterEncoding("utf-8");
 80         response.setContentType("text/html");
 81         PrintWriter out = response.getWriter();
 82         out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
 83         out.println("<HTML>");
 84         out.println("  <HEAD><TITLE>个人所得税计算</TITLE></HEAD>");
 85         out.println("  <BODY>");
 86         out.print(request.getParameter("num"));
 87         out.println("  </BODY>");
 88         out.println("</HTML>");
 89         out.flush();
 90         out.close();
 91     }
 92 
 93     /**
 94      * Initialization of the servlet. <br>
 95      * 
 96      * @throws ServletException
 97      *             if an error occurs
 98      */
 99     public void init() throws ServletException {
100         this.log("执行 init() 方法...");
101         ServletConfig conf = this.getServletConfig();
102         startPoint = Double.parseDouble(conf.getInitParameter("startPoint"));
103     }
104 
105     @Override
106     protected void service(HttpServletRequest arg0, HttpServletResponse arg1)
107             throws ServletException, IOException {
108         this.log("执行 service() 方法....");
109         super.service(arg0, arg1);
110     }
111 
112 }

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MyEclipse输出结果

 

生命周期详细分析

posted @ 2016-03-02 22:46  被罚站的树  阅读(214)  评论(0)    收藏  举报