maven 配置jdk版本

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <source>1.7</source>
                <target>1.7</target>
            </configuration>
        </plugin>
    </plugins>
</build>

<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>