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JavaEE基础(01)：Servlet实现方式，生命周期执行过程
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‎README.md‎

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# 参考文章
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[JavaEE基础(01)：Servlet实现方式，生命周期执行过程](https://mp.weixin.qq.com/s?__biz=MzU4Njg0MzYwNw==&mid=2247484304&idx=1&sn=dd6b6852e35031dd07f70d441f3ddc85&chksm=fdf45728ca83de3e158597030cf46b1677eccf533f9e1412690cd64b0ec0cce544711ceabddb&token=1248678182&lang=zh_CN#rd)<br/>
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持续更新中...
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## 项目简介
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Java基础类型，容器，并发，IO流，面向对象，Web编程等代码总结。
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## 关于作者
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【<b>公众号：知了一笑</b>】 【<b><a href="https://www.zhihu.com/people/cicadasmile/columns">知乎专栏</a></b>】<br/>
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<img width="255px" height="255px" src="https://avatars0.githubusercontent.com/u/50793885?s=460&v=4"/><br/>
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## 推荐项目
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|项目名称|GitHub地址|GitEE地址|推荐指数|
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|:---|:---|:---|:---|
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|SpringCloud微服务架构实战综合案例|[GitHub·点这里](https://github.com/cicadasmile/husky-spring-cloud)|[GitEE·点这里](https://gitee.com/cicadasmile/husky-spring-cloud)|☆☆☆☆☆|
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|SpringCloud微服务基础组件案例详解|[GitHub·点这里](https://github.com/cicadasmile/spring-cloud-base)|[GitEE·点这里](https://gitee.com/cicadasmile/spring-cloud-base)|☆☆☆|
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|SpringCloud实现分库分表模式下数据库实时扩容|[GitHub·点这里](https://github.com/cicadasmile/cloud-shard-jdbc)|[GitEE·点这里](https://gitee.com/cicadasmile/cloud-shard-jdbc)|☆☆☆☆☆|
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|SpringBoot框架基础应用入门到进阶|[GitHub·点这里](https://github.com/cicadasmile/spring-boot-base)|[GitEE·点这里](https://gitee.com/cicadasmile/spring-boot-base)|☆☆☆☆|
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|SpringBoot框架整合开发常用中间件|[GitHub·点这里](https://github.com/cicadasmile/middle-ware-parent)|[GitEE·点这里](https://gitee.com/cicadasmile/middle-ware-parent)|☆☆☆☆☆|
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|Spring+Mvc框架基础案例详解|[GitHub·点这里](https://github.com/cicadasmile/spring-mvc-parent)|[GitEE·点这里](https://gitee.com/cicadasmile/spring-mvc-parent)|☆☆|
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|Java描述常用设计模式,算法,数据结构|[GitHub·点这里](https://github.com/cicadasmile/model-arithmetic-parent)|[GitEE·点这里](https://gitee.com/cicadasmile/model-arithmetic-parent)|☆☆☆☆☆|
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|Linux系统基础、运维,常用操作积累|[GitHub·点这里](https://github.com/cicadasmile/linux-system-base)|[GitEE·点这里](https://gitee.com/cicadasmile/linux-system-base)|☆☆☆|

‎java-ee-base-parent/node01-servlet-life/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>java-ee-base-parent</artifactId>
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<groupId>com.java.ee.parent</groupId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.node01.servlet</groupId>
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<artifactId>node01-servlet-life</artifactId>
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<packaging>war</packaging>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<maven.compiler.source>1.8</maven.compiler.source>
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<maven.compiler.target>1.8</maven.compiler.target>
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<jstl.version>1.2</jstl.version>
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<servlet-api.version>2.5</servlet-api.version>
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<jsp-api.version>2.0</jsp-api.version>
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</properties>
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<dependencies>
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<!-- JSP相关 依赖包-->
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<dependency>
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<groupId>jstl</groupId>
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<artifactId>jstl</artifactId>
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<version>${jstl.version}</version>
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</dependency>
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>jsp-api</artifactId>
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<version>${jsp-api.version}</version>
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<scope>provided</scope>
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</dependency>
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<!-- servlet依赖包 -->
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>servlet-api</artifactId>
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<version>${servlet-api.version}</version>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.12</version>
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</dependency>
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</dependencies>
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</project>

‎java-ee-base-parent/node01-servlet-life/src/main/java/com/node01/servlet/impl/ServletOneImpl.java‎

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package com.node01.servlet.impl;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import java.io.IOException;
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public class ServletOneImpl extends HttpServlet {
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@Override
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protected void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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response.setContentType("text/html;charset=utf-8");
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response.getWriter().print("执行：doGet");
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}
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@Override
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protected void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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response.setContentType("text/html;charset=utf-8");
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response.getWriter().print("执行：doPost");
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}
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}

‎java-ee-base-parent/node01-servlet-life/src/main/java/com/node01/servlet/impl/ServletThreeImpl.java‎

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package com.node01.servlet.impl;
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import javax.servlet.*;
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import javax.servlet.http.HttpServletResponse;
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import java.io.IOException;
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public class ServletThreeImpl implements Servlet {
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@Override
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public void init(ServletConfig servletConfig) throws ServletException {
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servletConfig.getServletName();
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System.out.println("init 被调用...");
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}
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@Override
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public void service(ServletRequest servletRequest, ServletResponse servletResponse)
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throws ServletException, IOException {
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System.out.println("ThreadId："+Thread.currentThread().getId());
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System.out.println("service 被调用...");
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HttpServletResponse response = (HttpServletResponse)servletResponse ;
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response.getWriter().print("Servlet.Life");
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}
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// 关闭 Tomcat 服务时可以看到控制台打印
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@Override
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public void destroy() {
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System.out.println("destroy 被调用...");
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}
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@Override
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public ServletConfig getServletConfig() {
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System.out.println("getServletConfig 被调用...");
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return null;
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}
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@Override
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public String getServletInfo() {
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System.out.println("getServletInfo 被调用...");
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return null;
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}
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}

‎java-ee-base-parent/node01-servlet-life/src/main/java/com/node01/servlet/impl/ServletTwoImpl.java‎

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package com.node01.servlet.impl;
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import javax.servlet.GenericServlet;
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import javax.servlet.ServletException;
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import javax.servlet.ServletRequest;
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import javax.servlet.ServletResponse;
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import javax.servlet.http.HttpServletResponse;
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import java.io.IOException;
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/**
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* Servlet实现方式二
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*/
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public class ServletTwoImpl extends GenericServlet {
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@Override
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public void service(ServletRequest servletRequest, ServletResponse servletResponse)
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throws ServletException, IOException {
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HttpServletResponse response = (HttpServletResponse)servletResponse ;
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response.setContentType("text/html;charset=utf-8");
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response.getWriter().print("执行：service");
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}
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}

‎java-ee-base-parent/node01-servlet-life/src/main/webapp/WEB-INF/web.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns="http://java.sun.com/xml/ns/javaee"
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xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
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id="WebApp_ID" version="2.5">
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<display-name>frame_servlet</display-name>
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<context-param>
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<param-name>encoding</param-name>
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<param-value>UTF-8</param-value>
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</context-param>
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<!-- 参数配置 -->
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<context-param>
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<param-name>my-name</param-name>
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<param-value>cicada</param-value>
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</context-param>
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<context-param>
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<param-name>time</param-name>
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<param-value>2019-11-13</param-value>
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</context-param>
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<!-- Servlet配置 -->
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<!-- 请求：http://localhost:6003/servletOneImpl -->
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<servlet>
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<servlet-name>servletOneImpl</servlet-name>
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<servlet-class>com.node01.servlet.impl.ServletOneImpl</servlet-class>
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</servlet>
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<servlet-mapping>
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<servlet-name>servletOneImpl</servlet-name>
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<url-pattern>/servletOneImpl</url-pattern>
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</servlet-mapping>
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<servlet>
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<servlet-name>servletTwoImpl</servlet-name>
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<servlet-class>com.node01.servlet.impl.ServletTwoImpl</servlet-class>
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</servlet>
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<servlet-mapping>
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<servlet-name>servletTwoImpl</servlet-name>
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<url-pattern>/servletTwoImpl</url-pattern>
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</servlet-mapping>
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<servlet>
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<servlet-name>servletThreeImpl</servlet-name>
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<servlet-class>com.node01.servlet.impl.ServletThreeImpl</servlet-class>
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</servlet>
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<servlet-mapping>
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<servlet-name>servletThreeImpl</servlet-name>
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<url-pattern>/servletThreeImpl</url-pattern>
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</servlet-mapping>
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</web-app>

‎java-se-base-parent/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>java-base-parent</artifactId>
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<groupId>com.java.parent</groupId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.java.se.parent</groupId>
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<artifactId>java-se-base-parent</artifactId>
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<packaging>pom</packaging>
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</project>

‎pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.java.parent</groupId>
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<artifactId>java-base-parent</artifactId>
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<version>1.0-SNAPSHOT</version>
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<packaging>pom</packaging>
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<modules>
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<!-- JavaSE 基础模块 -->
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<module>java-se-base-parent</module>
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<!-- JavaEE 基础模块 -->
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<module>java-ee-base-parent</module>
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</modules>
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</project>

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