Maven编译出现:File encoding has not been set, using platform encoding GBK

Maven编译出现:File encoding has not been set, using platform encoding GBK,
在maven 3可以做如下配置设置文件编码
<project>
  ...
  <build>
    <sourceEncoding>UTF-8</sourceEncoding>
    ...
  </build>
  ...
</project>

在maven 2 中采用如下配置
<project>
  ...
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    ...
  </properties>
  ...
</project>