idea maven configure the operating environment

Add tomcat plugin

		<plugin>
          <groupId>org.apache.tomcat.maven</groupId>
          <artifactId>tomcat7-maven-plugin</artifactId>
          <version>2.2</version>
          <configuration>
            <port>8888</port>
          </configuration>
       </plugin>

This will add support tomcat7, the runtime is this

Configuring maven compiler plugin

<plugin>
     <artifactId>maven-compiler-plugin</artifactId>
     <version>3.8.0</version>
     <configuration>
        <target>1.8</target>
        <source>1.8</source>
        <encoding>UTF-8</encoding>
     </configuration>
</plugin>