用java代码启动tomcat

package com.test;
import org.apache.catalina.connector.Connector;
import org.apache.catalina.startup.Tomcat;
import org.junit.Test;
public class TestTomcat {//Test.class
    //通过如下方法启动tomcat
    @Test
    public void testTomcat()throws Exception {
        //1.构建tomcat对象(遵循JAVAEE规范)
        Tomcat t=new Tomcat();
        //2.构建Connector对象(连接器),负责协议配置,端口配置等
        Connector conn=new Connector("HTTP/1.1");
        conn.setPort(8080);
        t.getService().addConnector(conn);
        //3.启动tomcat
        t.start();
        //4.阻塞当前线程
        t.getServer().await();
        
    }
}

 需要导入的jar包

<dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>

        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-core</artifactId>
            <version>9.0.12</version>
        </dependency>

    </dependencies>

 2.注册servlet:

import org.apache.catalina.Context;
import org.apache.catalina.connector.Connector;
import org.apache.catalina.startup.Tomcat;
import org.junit.Test;
public class ServletTests {
    //嵌入式tomcat测试
    @Test
    public void testServlet()throws Exception {
      //构建tomcat对象,此对象为启动tomcat服务的入口对象
      Tomcat t=new Tomcat();
      //构建Connector对象,此对象负责与客户端的连接.
      Connector con=new Connector("HTTP/1.1");
      //设置服务端的监听端口
      con.setPort(8080);
      //将Connector注册到service中
      t.getService().addConnector(con);
      //注册servlet
      Context ctx=t.addContext("/",null);
      Tomcat.addServlet(
              ctx,
              "helloServlet",
              "com.company.java.servlet.HelloServlet");
      //映射servlet
      ctx.addServletMappingDecoded("/hello", "helloServlet");
      //启动tomcat
      t.start();
      //阻塞当前线程
      System.out.println(Thread.currentThread().getName());
      t.getServer().await();
      //while(true) {}
    }
}