导入maven项目jdk版本报错

直接在pom.xml中加入插件，之后update project，jdk变为1.7了

<build>

    <plugins>

        <plugin>

            <artifactId>maven-compiler-plugin</artifactId>

            <configuration>

                <source>1.7</source>

                <target>1.7</target>

            </configuration>

        </plugin>

    </plugins>

</build>