新建maven项目默认使用jdk1.8

 在maven conf/settings.xml 中添加内容<profile>

 <profiles>
    
    <profile>   
	    <id>jdk1.8</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> 
   
  </profiles>