参考:http://jingyan.baidu.com/article/84b4f565efc39e60f7da326b.html
修改maven工程下:conf/setting.xml
<profile> <id>jdk-1.7</id> <activation> <activeByDefault>true</activeByDefault> <jdk>1.7</jdk> </activation> <properties> <maven.compiler.source>1.7</maven.compiler.source> <maven.compiler.target>1.7</maven.compiler.target> <maven.compiler.compilerVersion>1.7</maven.compiler.compilerVersion> </properties> </profile>
保存,刷新项目