您可以使用该插件部署到单独运行的tomcat 9。
run目标不会起作用，但deploy目标会。

<plugin>
    <groupId>org.apache.tomcat.maven</groupId>
    <artifactId>tomcat7-maven-plugin</artifactId>
    <version>2.2</version>
    <configuration>
        <url>http://localhost:8080/manager/text</url>
        <server>TomcatServer</server>
        <path>/myapp</path>
    </configuration>
</plugin>

Maven目标：

mvn tomcat7:deploy
mvn tomcat7:undeploy
mvn tomcat7:redeploy

注意：不要忘记在tomcat-users.xml和maven settings.xml中添加tomcat用户
tomcat-user.xml

<?xml version='1.0' encoding='utf-8'?>
<tomcat-users>
  <role rolename="manager-gui"/>
  <role rolename="manager-script"/>
  <user username="admin" password="password" roles="manager-gui,manager-script" />
</tomcat-users>

manager-scriptrole使应用程序（即maven）能够将jar/war部署到应用服务器。

Maven file settings.xml

<?xml version="1.0" encoding="UTF-8"?>
<settings ...>
    <servers>
        <server>
            <id>TomcatServer</id>
            <username>admin</username>
            <password>password</password>
        </server>
    </servers>
</settings>

正如在其他答案中所述，* tomcat 7-maven-plugin* 仍然可以用于部署到运行的Tomcat 9中，并提供管理器应用程序。但是，要运行embeddedTomcat 9，请尝试Cargo插件：

<plugin>
  <groupId>org.codehaus.cargo</groupId>
  <artifactId>cargo-maven2-plugin</artifactId>
  <version>1.7.6</version>
  <configuration>
    <container>
      <containerId>tomcat9x</containerId>
      <type>embedded</type>
    </container>
  </configuration>
</plugin>

从以下内容开始：

mvn org.codehaus.cargo:cargo-maven2-plugin:run

我一直在为同一个问题寻找答案。现在我找到了。

<plugin>
                <groupId>org.codehaus.cargo</groupId>
                <artifactId>cargo-maven2-plugin</artifactId>
                <version>1.8.3</version>
                <configuration>
                    <container>
                        <containerId>tomcat9x</containerId>
                        <type>embedded</type>
                    </container>
                    <deployables>
                        <deployable>
                            <type>war</type>
                            <location>${project.build.directory}/${project.build.finalName}.war</location>
                            <properties>
                                <context>/</context>
                            </properties>
                        </deployable>
                    </deployables>
                </configuration>
            </plugin>

和运行与

mvn package cargo:run

我得到了这个工作与货物maven3插件

<plugin>
<groupId>org.codehaus.cargo</groupId>
<artifactId>cargo-maven3-plugin</artifactId>
<version>1.10.8</version>
<configuration>
    <container>

        <containerId>tomcat9x</containerId>
        <type>installed</type>

        <systemProperties>
            <property1>value1</property1>
        </systemProperties>

    </container>

    <deployables>
        <deployable>
            <artifactId>MYAPP</artifactId>
            <groupId>com.company</groupId>
            <type>war</type>
            <location>${project.build.directory}/${project.build.finalName}.war</location>
            <pingURL>http://127.0.0.1:8080/APP</pingURL>
        </deployable>
    </deployables>

    <configuration>
        <type>existing</type>
        <home>C://DEVTOOLS//apache-tomcat-9.0.36</home>
    </configuration>

</configuration>

<executions>
    <execution>
        <id>start-server</id>
        <phase>pre-integration-test</phase>
        <goals>
            <goal>start</goal>
        </goals>
    </execution>
</executions>