springboot /tmp 临时目录的具体实现

cat /usr/lib/tmpfiles.d/tmp.conf
#  This file is part of systemd.
#
#  systemd is free software; you can redistribute it and/or modify it
#  under the terms of the GNU Lesser General Public License as published by
#  the Free Software Foundation; either version 2.1 of the License, or
#  (at your option) any later version.

# See tmpfiles.d(5) for details

# Clear tmp directories separately, to make them easier to override
v /tmp 1777 root root 10d
v /var/tmp 1777 root root 30d

# Exclude namespace mountpoints created with PrivateTmp=yes
x /tmp/systemd-private-%b-*
X /tmp/systemd-private-%b-*/tmp
x /var/tmp/systemd-private-%b-*
X /var/tmp/systemd-private-%b-*/tmp

vim /usr/lib/tmpfiles.d/tmp.conf

# 添加下面一行

x /tmp/tomcat.*

# 重启服务
systemctl restart systemd-tmpfiles-clean

#定临时目录为/app/xxx/tmp
-Djava.io.tmpdir=/app/xxx/tmp（自定义路径）

-java.tmp.dir=/data/upload_tmp

spring:
  http:
    multipart:
      location: /data/upload_tmp

@Bean
public MultipartConfigElement multipartConfigElement() {
	MultipartConfigFactory factory = new MultipartConfigFactory();
	String location = System.getProperty("user.dir")+"/data/tmp";
	File tmpFile = new File(location);
	if (!tmpFile.exists()){
		tmpFile.mkdirs();
	}
	factory.setLocation(location);
	return factory.createMultipartConfig();
}