原文：http://stackoverflow.com/questions/13212365/mvn-tomcatrun-change-default-maven-tomcat-port
You can use:
mvn tomcat:run -Dmaven.tomcat.port=8081
to start it on a different port (8081 in this case).
Alternatively, define a pluginMangement section in your pom that configures the 'port' configuration on the tomcat plugin.