Java图片处理 Thumbnailator

<dependency>
  <groupId>net.coobird</groupId>
  <artifactId>thumbnailator</artifactId>
  <version>0.4.8</version>
</dependency>

http://blog.csdn.net/wangpeng047/article/details/17610451
http://blog.csdn.net/wangpeng047/article/details/19624993