<build>

<plugins>

<plugin>

<groupId>org.apache.maven.plugins</groupId>

<artifactId>maven-compiler-plugin</artifactId>

<version>3.2</version>

<configuration>

<target>1.7</target>

<source>1.7</source>

</configuration>

</plugin>

</plugins>

</build>

 

 

 

点击maven添加插件    加入配置

<configuration>

<target>1.7</target>

<source>1.7</source>

</configuration>