servlet生命周期

<!-----webXML配置servlet----->

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>HeadFirstJspServletChap05</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>

<servlet>
<servlet-name>lifeServlet</servlet-name>
<servlet-class>com.java.web.LifeServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>lifeServlet</servlet-name>
<url-pattern>/life</url-pattern>
</servlet-mapping>

 

package com.java.web;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LifeServlet extends HttpServlet{

private static final long serialVersionUID = 1L;

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("service");
}

 

//处理请求时调用

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("service");
}

 

//servlet卸载时调用

@Override
public void destroy() {
System.out.println("servlet销毁");
}

//init容器启动时或者是第一个请求访问servlet是调用

@Override
public void init() throws ServletException {
System.out.println("servlet初始化");
}

}