Spring Boot2.0之原理—创建内置Tomcat容器

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前面所述的https://www.cnblogs.com/toov5/p/9823728.html 中的第一条先不赘述了，就是玩了maven

重点介绍后两条

首先内置Tomcat：

SpringBoot中内置tomcat服务器

Java操作创建tomcat

我们点击pom中的

持续点击到

继续点击会发现：

这个依赖为我所需~

注意：Springboot2.0之后 Tomcat8.0以上版本

引入到自己的pom中（类似的还有其他的依赖包）：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.toov5.tomcat</groupId>
<artifactId>tomcat</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencies>

<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-core</artifactId>
<version>8.5.16</version>
</dependency> 
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-jasper</artifactId>
<version>8.5.16</version>
</dependency>
</dependencies> </project>

servlet代码：

package com.toov5.servlet;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 IndexServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
} @Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.getWriter().print("successful congratulation ");
}
}

然后用servlet创建Tomcat容器

package com.toov5.tomcat;import org.apache.catalina.LifecycleException;
import org.apache.catalina.core.StandardContext;
import org.apache.catalina.startup.Tomcat;
import org.apache.catalina.startup.Tomcat.FixContextListener;import com.toov5.servlet.IndexServlet;//使用Java创建Tomcat容器
//tomcat 底层执行程序最终执行servlet
//Springmvc底层使用servletpublic class Test {
private static int PORT = 8080; //端口
private static String CONTEX_PATH = "/toov5"; //项目访问名称
private static String SERVLET_NAME="IndexServet";
public static void main(String[] args) {
Tomcat tomcatServer = new Tomcat();
tomcatServer.setPort(PORT); //指定端口号
//是否设置自动部署
tomcatServer.getHost().setAutoDeploy(false);
//创建上下文,拿到上下文后就可以设置整个访问地址了
StandardContext standardContext = new StandardContext();
standardContext.setPath(CONTEX_PATH);
//监听上下文
standardContext.addLifecycleListener(new FixContextListener());
standardContext.addLifecycleListener(new FixContextListener());
// tomcat容器添加standardContext 添加整个context
tomcatServer.getHost().addChild(standardContext);
// 创建servlet servlet的名字叫IndexServlet
tomcatServer.addServlet(CONTEX_PATH, SERVLET_NAME, new IndexServlet());
// 添加servleturl映射
standardContext.addServletMappingDecoded("/index", SERVLET_NAME);
try {
tomcatServer.start();
} catch (LifecycleException e) {
e.printStackTrace();
}
System.out.println("tomcat服务器启动成功！");
//需要异步接受请求
tomcatServer.getServer().await();
} }

这段代码等同于，

web.xml中的：

<servlet>
<servlet-name>toov5</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/springmvc.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>toov5</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

项目目录结构：