<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
<version>3.5.1</version>
</plugin>
</plugins>
</build>
加上这个插件就可以修改项目的编译版本