EmbedTomcatJava（内嵌tomcat启动简述）

简单记录⼀下内部tomcat启动

maven pom.xml

org.apache.tomcat.embed tomcat-embed-core 8.5.28

org.apache.tomcat tomcat-jasper 8.5.28

org.springframework spring-web 5.0.4.RELEASE compile

org.springframework spring-webmvc 5.0.4.RELEASE compile

org.apache.maven.plugins maven-compiler-plugin 3.5.1

1.8 1.8

UTF-8

tomcat启动类

/** *

* @author Programming is an art from. * @Description: TODO */

public class TomcatStart {

public static int TOMCAT_PORT = 8080;

public static String TOMCAT_HOSTNAME = \"127.0.0.1\"; public static String WEBAPP_PATH = \"src/main\";

public static String WEBINF_CLASSES = \"/WEB-INF/classes\"; public static String CLASS_PATH = \"target/classes\"; public static String INTERNAL_PATH = \"/\";

public static void main(String[] args) throws ServletException, LifecycleException { TomcatStart.run(); }

public static void run() throws ServletException, LifecycleException { Tomcat tomcat = new Tomcat();

tomcat.setPort(TomcatStart.TOMCAT_PORT);

tomcat.setHostname(TomcatStart.TOMCAT_HOSTNAME); tomcat.setBaseDir(\".\"); // tomcat 信息保存在项⽬下 /*

* https://www.cnblogs.com/ChenD/p/10061008.html */

StandardContext myCtx = (StandardContext) tomcat

.addWebapp(\"/access\

/*

* true时：相关classes | jar 修改时，会重新加载资源，不过资源消耗很⼤

* autoDeploy 与这个很相似，tomcat⾃带的热部署不是特别可靠，效率也不⾼。⽣产环境不建议开启。 * 相关⽂档：

* http://www.blogjava.net/wangxinsh55/archive/2011/05/31/351449.html */

myCtx.setReloadable(false); // 上下⽂监听器

myCtx.addLifecycleListener(new AprLifecycleListener());

/*String webAppMount = System.getProperty(\"user.dir\") + File.separator + TomcatStart.CLASS_PATH; WebResourceRoot root = new StandardRoot(myCtx); root.addPreResources(

new DirResourceSet(root, TomcatStart.WEBINF_CLASSES, webAppMount, TomcatStart.INTERNAL_PATH));*/

// 注册servlet

tomcat.addServlet(\"/access\ // servlet mapping

myCtx.addServletMappingDecoded(\"/demo.do\ tomcat.start();

tomcat.getServer().await(); } }

注意！ contextPath不要设置为 /否则会报错, 错误信息为以下。

警告: A context path must either be an empty string or start with a '/' and do not end with a '/'. The path [/] does not meet these criteria and has been changed to []Exception in thread \"main\" java.lang.NullPointerException

at org.apache.catalina.startup.Tomcat.addServlet(Tomcat.java:341) at org.apache.catalina.startup.Tomcat.addServlet(Tomcat.java:325) at cn.learn.config.TomcatStart.run(TomcatStart.java:63) at cn.learn.config.TomcatStart.main(TomcatStart.java:33)

servlet class

/** *

* @author Programming is an art from. * @Description: TODO */

public class DemoServlet extends HttpServlet{ /** * */

private static final long serialVersionUID = 1L;

@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(\"access success\"); }

}