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1、查看linux系统信息，并升级系统

$ cat /etc/os-release

$ lsb_release -a

$ uname -a

$ sudo apt update

$ sudo apt list —upgradable

$ sudo apt upgrade -y

webrx@us:~$ cat /etc/os-release 
NAME="Ubuntu"
VERSION="20.04.3 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04.3 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal
webrx@us:~$ sudo apt update 
[sudo] password for webrx: 
Hit:1 http://mirrors.aliyun.com/ubuntu focal InRelease                   
Get:2 http://mirrors.aliyun.com/ubuntu focal-updates InRelease [114 kB]  
Get:3 http://mirrors.aliyun.com/ubuntu focal-backports InRelease [101 kB]                  
Get:4 http://mirrors.aliyun.com/ubuntu focal-security InRelease [114 kB]
Get:5 http://mirrors.aliyun.com/ubuntu focal-updates/main amd64 Packages [1,258 kB]
Hit:6 http://ppa.launchpad.net/git-core/ppa/ubuntu focal InRelease
Get:7 http://mirrors.aliyun.com/ubuntu focal-updates/main Translation-en [265 kB]
Get:8 http://mirrors.aliyun.com/ubuntu focal-updates/main amd64 c-n-f Metadata [14.4 kB]
Get:9 http://mirrors.aliyun.com/ubuntu focal-updates/restricted amd64 Packages [486 kB]
Get:10 http://mirrors.aliyun.com/ubuntu focal-updates/restricted Translation-en [69.6 kB]
Get:11 http://mirrors.aliyun.com/ubuntu focal-updates/universe amd64 Packages [865 kB]
Get:12 http://mirrors.aliyun.com/ubuntu focal-updates/universe Translation-en [185 kB]
Get:13 http://mirrors.aliyun.com/ubuntu focal-updates/universe amd64 c-n-f Metadata [19.2 kB]
Get:14 http://mirrors.aliyun.com/ubuntu focal-security/main amd64 Packages [909 kB]
Get:15 http://mirrors.aliyun.com/ubuntu focal-security/main Translation-en [173 kB]
Get:16 http://mirrors.aliyun.com/ubuntu focal-security/main amd64 c-n-f Metadata [8,820 B]
Get:17 http://mirrors.aliyun.com/ubuntu focal-security/restricted amd64 Packages [447 kB]
Get:18 http://mirrors.aliyun.com/ubuntu focal-security/restricted Translation-en [64.1 kB]
Get:19 http://mirrors.aliyun.com/ubuntu focal-security/universe amd64 Packages [643 kB]
Get:20 http://mirrors.aliyun.com/ubuntu focal-security/universe Translation-en [103 kB]          
Get:21 http://mirrors.aliyun.com/ubuntu focal-security/universe amd64 c-n-f Metadata [12.5 kB]   
Fetched 5,851 kB in 12s (470 kB/s)                                                               
Reading package lists... Done
Building dependency tree       
Reading state information... Done
11 packages can be upgraded. Run 'apt list --upgradable' to see them.
webrx@us:~$ sudo apt list --upgradable
Listing... Done
distro-info-data/focal-updates,focal-security 0.43ubuntu1.8 all [upgradable from: 0.43ubuntu1.6]
libpam-modules-bin/focal-updates 1.3.1-5ubuntu4.3 amd64 [upgradable from: 1.3.1-5ubuntu4.2]
libpam-modules/focal-updates 1.3.1-5ubuntu4.3 amd64 [upgradable from: 1.3.1-5ubuntu4.2]
libpam-runtime/focal-updates 1.3.1-5ubuntu4.3 all [upgradable from: 1.3.1-5ubuntu4.2]
libpam0g/focal-updates 1.3.1-5ubuntu4.3 amd64 [upgradable from: 1.3.1-5ubuntu4.2]
libpython3.8-minimal/focal-updates,focal-security 3.8.10-0ubuntu1~20.04.1 amd64 [upgradable from: 3.8.10-0ubuntu1~20.04]
libpython3.8-stdlib/focal-updates,focal-security 3.8.10-0ubuntu1~20.04.1 amd64 [upgradable from: 3.8.10-0ubuntu1~20.04]
libpython3.8/focal-updates,focal-security 3.8.10-0ubuntu1~20.04.1 amd64 [upgradable from: 3.8.10-0ubuntu1~20.04]
python3.8-minimal/focal-updates,focal-security 3.8.10-0ubuntu1~20.04.1 amd64 [upgradable from: 3.8.10-0ubuntu1~20.04]
python3.8/focal-updates,focal-security 3.8.10-0ubuntu1~20.04.1 amd64 [upgradable from: 3.8.10-0ubuntu1~20.04]
tzdata/focal-updates,focal-security 2021a-2ubuntu0.20.04 all [upgradable from: 2021a-0ubuntu0.20.04]
webrx@us:~$ sudo apt upgrade -y
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
  distro-info-data libpam-modules libpam-modules-bin libpam-runtime libpam0g libpython3.8
  libpython3.8-minimal libpython3.8-stdlib python3.8 python3.8-minimal tzdata
11 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
7 standard security updates
Need to get 6,999 kB of archives.
After this operation, 2,048 B of additional disk space will be used.
Get:1 http://mirrors.aliyun.com/ubuntu focal-updates/main amd64 libpam0g amd64 1.3.1-5ubuntu4.3 [55.4 kB]
Get:2 http://mirrors.aliyun.com/ubuntu focal-updates/main amd64 libpam-modules-bin amd64 1.3.1-5ubuntu4.3 [41.2 kB]
Get:3 http://mirrors.aliyun.com/ubuntu focal-updates/main amd64 libpam-modules amd64 1.3.1-5ubuntu4.3 [260 kB]
Get:4 http://mirrors.aliyun.com/ubuntu focal-updates/main amd64 libpython3.8 amd64 3.8.10-0ubuntu1~20.04.1 [1,625 kB]
Get:5 http://mirrors.aliyun.com/ubuntu focal-updates/main amd64 python3.8 amd64 3.8.10-0ubuntu1~20.04.1 [387 kB]
Get:6 http://mirrors.aliyun.com/ubuntu focal-updates/main amd64 libpython3.8-stdlib amd64 3.8.10-0ubuntu1~20.04.1 [1,674 kB]
Get:7 http://mirrors.aliyun.com/ubuntu focal-updates/main amd64 python3.8-minimal amd64 3.8.10-0ubuntu1~20.04.1 [1,900 kB]
Get:8 http://mirrors.aliyun.com/ubuntu focal-updates/main amd64 libpython3.8-minimal amd64 3.8.10-0ubuntu1~20.04.1 [717 kB]
Get:9 http://mirrors.aliyun.com/ubuntu focal-updates/main amd64 libpam-runtime all 1.3.1-5ubuntu4.3 [37.3 kB]
Get:10 http://mirrors.aliyun.com/ubuntu focal-updates/main amd64 distro-info-data all 0.43ubuntu1.8 [4,664 B]
Get:11 http://mirrors.aliyun.com/ubuntu focal-updates/main amd64 tzdata all 2021a-2ubuntu0.20.04 [297 kB]
Fetched 6,999 kB in 13s (550 kB/s)                                                               
Preconfiguring packages ...
(Reading database ... 76022 files and directories currently installed.)
Preparing to unpack .../libpam0g_1.3.1-5ubuntu4.3_amd64.deb ...
Unpacking libpam0g:amd64 (1.3.1-5ubuntu4.3) over (1.3.1-5ubuntu4.2) ...
Setting up libpam0g:amd64 (1.3.1-5ubuntu4.3) ...
(Reading database ... 76022 files and directories currently installed.)
Preparing to unpack .../libpam-modules-bin_1.3.1-5ubuntu4.3_amd64.deb ...
Unpacking libpam-modules-bin (1.3.1-5ubuntu4.3) over (1.3.1-5ubuntu4.2) ...
Setting up libpam-modules-bin (1.3.1-5ubuntu4.3) ...
(Reading database ... 76022 files and directories currently installed.)
Preparing to unpack .../libpam-modules_1.3.1-5ubuntu4.3_amd64.deb ...
Unpacking libpam-modules:amd64 (1.3.1-5ubuntu4.3) over (1.3.1-5ubuntu4.2) ...
Setting up libpam-modules:amd64 (1.3.1-5ubuntu4.3) ...
(Reading database ... 76022 files and directories currently installed.)
Preparing to unpack .../0-libpython3.8_3.8.10-0ubuntu1~20.04.1_amd64.deb ...
Unpacking libpython3.8:amd64 (3.8.10-0ubuntu1~20.04.1) over (3.8.10-0ubuntu1~20.04) ...
Preparing to unpack .../1-python3.8_3.8.10-0ubuntu1~20.04.1_amd64.deb ...
Unpacking python3.8 (3.8.10-0ubuntu1~20.04.1) over (3.8.10-0ubuntu1~20.04) ...
Preparing to unpack .../2-libpython3.8-stdlib_3.8.10-0ubuntu1~20.04.1_amd64.deb ...
Unpacking libpython3.8-stdlib:amd64 (3.8.10-0ubuntu1~20.04.1) over (3.8.10-0ubuntu1~20.04) ...
Preparing to unpack .../3-python3.8-minimal_3.8.10-0ubuntu1~20.04.1_amd64.deb ...
Unpacking python3.8-minimal (3.8.10-0ubuntu1~20.04.1) over (3.8.10-0ubuntu1~20.04) ...
Preparing to unpack .../4-libpython3.8-minimal_3.8.10-0ubuntu1~20.04.1_amd64.deb ...
Unpacking libpython3.8-minimal:amd64 (3.8.10-0ubuntu1~20.04.1) over (3.8.10-0ubuntu1~20.04) ...
Preparing to unpack .../5-libpam-runtime_1.3.1-5ubuntu4.3_all.deb ...
Unpacking libpam-runtime (1.3.1-5ubuntu4.3) over (1.3.1-5ubuntu4.2) ...
Setting up libpam-runtime (1.3.1-5ubuntu4.3) ...
(Reading database ... 76022 files and directories currently installed.)
Preparing to unpack .../distro-info-data_0.43ubuntu1.8_all.deb ...
Unpacking distro-info-data (0.43ubuntu1.8) over (0.43ubuntu1.6) ...
Preparing to unpack .../tzdata_2021a-2ubuntu0.20.04_all.deb ...
Unpacking tzdata (2021a-2ubuntu0.20.04) over (2021a-0ubuntu0.20.04) ...
Setting up libpython3.8-minimal:amd64 (3.8.10-0ubuntu1~20.04.1) ...
Setting up distro-info-data (0.43ubuntu1.8) ...
Setting up tzdata (2021a-2ubuntu0.20.04) ...
Current default time zone: 'Etc/UTC'
Local time is now:      Sat Oct  9 11:50:18 UTC 2021.
Universal Time is now:  Sat Oct  9 11:50:18 UTC 2021.
Run 'dpkg-reconfigure tzdata' if you wish to change it.
Setting up python3.8-minimal (3.8.10-0ubuntu1~20.04.1) ...
Setting up libpython3.8-stdlib:amd64 (3.8.10-0ubuntu1~20.04.1) ...
Setting up python3.8 (3.8.10-0ubuntu1~20.04.1) ...
Setting up libpython3.8:amd64 (3.8.10-0ubuntu1~20.04.1) ...
Processing triggers for libc-bin (2.31-0ubuntu9.2) ...
Processing triggers for man-db (2.9.1-1) ...
Processing triggers for mime-support (3.64ubuntu1) ...
webrx@us:~$

2、下载JDK17

linux 系统下，使用wget下载

$ wget https://download.oracle.com/java/17/latest/jdk-17_linux-x64_bin.tar.gz

3、解压jdk-17_linux-x64_bin.tar.gz

4、复制到/usr/local/jdk-17

5、配置环境变量

$ sudo vim /etc/profile

webrx@us:~$ cat /etc/profile
# /etc/profile: system-wide .profile file for the Bourne shell (sh(1))
# and Bourne compatible shells (bash(1), ksh(1), ash(1), ...).
if [ "${PS1-}" ]; then
  if [ "${BASH-}" ] && [ "$BASH" != "/bin/sh" ]; then
    # The file bash.bashrc already sets the default PS1.
    # PS1='\h:\w\$ '
    if [ -f /etc/bash.bashrc ]; then
      . /etc/bash.bashrc
    fi
  else
    if [ "`id -u`" -eq 0 ]; then
      PS1='# '
    else
      PS1='$ '
    fi
  fi
fi
if [ -d /etc/profile.d ]; then
  for i in /etc/profile.d/*.sh; do
    if [ -r $i ]; then
      . $i
    fi
  done
  unset i
fi
export JAVA_HOME=/usr/local/jdk-17
export CLASSPATH=.:$JAVA_HOME/lib
export PATH=.:$JAVA_HOME/bin:$JAVA_HOME/lib:$PATH
webrx@us:~$

6、编写Demo测试一下

Demo.java
public class Demo{
        public static void main(String[] args){
                System.out.println("Hello World");
                System.out.println(System.getProperty("java.version"));
                System.out.println(System.getProperty("java.home"));
                System.out.println(System.getProperty("os.name"));
        }
}

本文转自：https://blog.csdn.net/webrx/article/details/120678805