需要目标发行版 11 或 无效的目标发行版: 11：
修改File-Project Settings-Project-Project SDK-修改为1.8
修改File-Project Settings-Modules-Sources-Language level-修改为8-lambedas
修改File-Project Settings-Modules-Sources-Language level-修改为8-lambedas
修改File-Project Settings-Modules-Dependencies-SDK为1.8
File_Settings-Build,erecution,Deployment-Compiler-Java Compiler-Project bytecode version先留个为Same as Lanaguage Level
打包Install提示：Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.22.2:test
解决：pom.xml增加下面的内容
<groupId>org.apache.maven.plugins
<artifactId>maven-surefire-plugin
<version>2.7.1
<skipTests>true
</plugin>
增加后提示：version2.7.1找不到
去掉版本，成功
