使用Maven编译Java项目，默认的编译版本是1.5.
参考官网的说明－》https://maven.apache.org/plugins/maven-compiler-plugin/compile-mojo.html
| source | String | 2.0 | The -source argument for the Java compiler. Default value is: 1.5. User property is: maven.compiler.source. |
| target | String | 2.1 | The -encoding argument for the Java compiler. Default value is: ${project.build.sourceEncoding}. User property is: encoding. |
| encoding | String | 2.0 | The -target argument for the Java compiler. Default value is: 1.5. User property is: maven.compiler.target. |
如果要指定Java编译版本有两种方式
1）在settings.xml中指定，例如
<profiles>
<profile>
<id>JDK1.7</id>
<activation>
<activeByDefault>true</activeByDefault>
</activation>
<properties>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
<encoding>UTF-8</encoding>
</properties>
</profile>
</profiles> 2）在pom.xml中指定，例如
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
</plugins>
</build>