?Failed to execute goal org.apache.tomcat.maven:tomcat7-maven-plugin:2.2:run (default) on project webdemo: Execution default of goal org.apache.tomcat.maven:tomcat7-maven-plugin:2.2:run failed: Plugin org.apache.tomcat.maven:tomcat7-maven-plugin:2.2 or one of its dependencies could not be resolved: Failure to find commons-io:commons-io:jar:2.2 in http://maven.aliyun.com/nexus/content/groups/public/ was cached in the local repository, resolution will not be reattempted until the update interval of alimaven has elapsed or updates are forced -> [Help 1]

這是錯誤日志

謝謝！