public class AppTomcat {

    public static void main(String[] args) throws ServletException, LifecycleException {

        start();

    }

    public static void start() throws ServletException, LifecycleException {

        //创建Tomcat容器和设置端口

        Tomcat tomcatServer = new Tomcat();

        tomcatServer.setPort();

        StandardContext ctx = (StandardContext) tomcatServer.addWebapp("/", new File("src/main").getAbsolutePath());

        ctx.setReloadable(false);

        WebResourceRoot resources = new StandardRoot(ctx);

        File additionWebInfClasses = new File("target/classes");

        //告诉Tomcat项目的class目录，根目录

        resources.addPreResources(

                new DirResourceSet(resources, "/WEB-INF/classes", additionWebInfClasses.getAbsolutePath(), "/"));

        //启动容器

        tomcatServer.start();

        tomcatServer.getServer().await();

    }

}