Files upload and download based on SpringMVC
实现缩略图：使用Thunmnails库 或者使用AWT实现，前者较为简单。后者复杂。
文件上传service实现：
- 获取上传文件的输入流
- 获取上穿后文件的绝对路径
- 通过2中的绝对路径将输出流指向这个文件
- 创建缓冲字节数组 1KB
- 将输入流数据读取到buffer缓冲数组中，并返回字节数组的长度len，如果len>0表明输入流中有数据.
- 将字节数组写入输出流
- 执行while
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