Linux 安装 JDK

1、下载

[root@iZuf6j83unak4htk3braolZ opt]# java -version　　#查看是否安装过JDK
-bash: java: command not found

• 官网下载：https://www.oracle.com/java/technologies/javase-downloads.html ，利用远程终端工具将下载好的文件移到 Linux 下
• Linux 中 wget 下载

[root@iZuf6j83unak4htk3braolZ opt]# wget https://download.oracle.com/otn-pub/java/jdk/16.0.2+7/d4a915d82b4c4fbb9bde534da945d746/jdk-16.0.2_linux-x64_bin.tar.gz?AuthParam=1629184675_2387ac3c51777c9ca73b563216ee69b1　　#wget下载
--2021-08-17 15:17:49--  https://download.oracle.com/otn-pub/java/jdk/16.0.2+7/d4a915d82b4c4fbb9bde534da945d746/jdk-16.0.2_linux-x64_bin.tar.gz?AuthParam=1629184675_2387ac3c51777c9ca73b563216ee69b1
Resolving download.oracle.com (download.oracle.com)... 104.85.244.28
Connecting to download.oracle.com (download.oracle.com)|104.85.244.28|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 178295771 (170M) [application/x-gzip]
Saving to: ‘jdk-16.0.2_linux-x64_bin.tar.gz?AuthParam=1629184675_2387ac3c51777c9ca73b563216ee69b1’

jdk-16.0.2_linux-x64_bin.tar.gz?AuthParam=1629184675_2387ac3 100%[===========================================================================================================================================>] 170.04M  8.58MB/s    in 17s     

2021-08-17 15:18:07 (9.89 MB/s) - ‘jdk-16.0.2_linux-x64_bin.tar.gz?AuthParam=1629184675_2387ac3c51777c9ca73b563216ee69b1’ saved [178295771/178295771]

2、解压

[root@iZuf6j83unak4htk3braolZ opt]# ls　　#查看目录下文件
jdk-16.0.2_linux-64.tar.gz
[root@iZuf6j83unak4htk3braolZ opt]# tar -zxvf jdk-16.0.2_linux-64.tar.gz jdk-16.0.2　　#解压

3、配置环境变量

[root@iZuf6j83unak4htk3braolZ opt]# vi /etc/profile　　#查看，编辑文件

在文件的最后加入下面内容，然后保存

export JAVA_HOME=/opt/jdk-16.0.2　　#JDK解压后存放位置
export CLASSPATH=.:${JAVA_HOME}/jre/lib/rt.jar:${JAVA_HOME}/lib/dt.jar:${JAVA_HOME}/lib/tools.jar
export PATH=$PATH:${JAVA_HOME}/bin

让配置文件生效 　　source /etc/profile

[root@iZuf6j83unak4htk3braolZ opt]# source /etc/profile　　#让配置文件生效
[root@iZuf6j83unak4htk3braolZ opt]# java -version　　#查看java版本号
java version "16.0.2" 2021-07-20
Java(TM) SE Runtime Environment (build 16.0.2+7-67)
Java HotSpot(TM) 64-Bit Server VM (build 16.0.2+7-67, mixed mode, sharing)

至此，JDK已安装成功！