解决办法一

在maven安装目录，settings.xml设置全局jdk版本

<profile>    
        <id>jdk-1.8</id>    
         <activation>    
              <activeByDefault>true</activeByDefault>    
              <jdk>1.8</jdk>    
          </activation>    
        <properties>    
          <maven.compiler.source>1.8</maven.compiler.source>    
          <maven.compiler.target>1.8</maven.compiler.target>    
          <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>    
        </properties>    
</profile>

解决办法二

设置pom文件

<build>  
    <plugins>  
        <plugin>  
            <groupId>org.apache.maven.plugins</groupId>  
            <artifactId>maven-compiler-plugin</artifactId>  
            <version>3.1</version>  
            <configuration>  
                <source>1.8</source>  
                <target>1.8</target>  
            </configuration>  
        </plugin>  
    </plugins>  
</build>