错误提示：
No plugin found for prefix 'mybatis-generator' in the current project and in the plugin groups [org.mortbay.jetty, org.apache.maven.plugins, org.codehaus.mojo] available from the repositories [local (C:\Users\Administrator\.m2\repository), nexus (https://maven.aliyun.com/nexus/content/groups/public/)] -> [Help 1]No plugin found for prefix 'mybatis-gen
