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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

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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

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#定临时目录为/app/xxx/tmp

-Djava.io.tmpdir=/app/xxx/tmp（自定义路径）

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-java.tmp.dir=/data/upload_tmp

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spring:

  http:

    multipart:

      location: /data/upload_tmp

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@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();

}