请求: http://10.1.20.105:8080/fileupload/uploadFile?a=org~101
<form method="post" action="${ctx}/uploadFile?a=org~101" enctype="multipart/form-data">
<input type="file" name="mf" >
<input type="submit" value="上传" />
</form>
响应:{"result":"success","filename":"201906180901985423.jpg"}
http://10.1.20.105:8080/fileupload/images/201906180901985423.jpg?a=org~101
文件上传时,会根据a=org~101将文件保存到图片服务器 /home/www/upload/org/101 目录下
文件下载时,会根据a=org~101将 /images/201906180901985423.jpg 重定向到 /upload/org/101/201906180901985423.jpg
ln -s /home/www/upload ${tomcat_home}/webapps/fileupload/upload
ln -s /home/www/upload webapps/fileupload/upload