BufferedInputStream in = new BufferedInputStream(doc2.getContent());//读取文件到输入流

OutputStream out = response.getOutputStream();//获取response的输出流

try{

	byte[] buf = new byte[2048];//每次读流的字节数

	int len=0;

	while((len = in.read(buf))>0)  {

	       out.write(buf,0,len);//将图片写入到输出流里面不断返回数据给请求源

	}

	in.close();

	out.flush();

	out.close();

}catch (Exception e) {

	// TODO: handle exception

	LogUtil.error("Get picture with uuid:"+uuid, e);

}finally{

	in.close();

	out.close();

}