centos 7安装部署java jdk 8,设置java环境变量(超详细，其他linux系统也可通过该方法安装java,配置java环境变量)

本文详细介绍了在CentOS Linux 7.5.1804系统上安装和配置Java 8的过程，包括下载、解压JDK，卸载系统自带的JDK，设置环境变量，以及验证安装是否成功。

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前置配置

操作系统：CentOS Linux release 7.5.1804
Java版本号：jdk1.8.0_191

#OS版本号查询
[troll@standalone ~]$ cat /etc/centos-release
CentOS Linux release 7.5.1804 (Core)

java jdk 下载

jdk 8下载地址：https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
选择：jdk-8u191-linux-x64.tar.gz
下载到本地目录：/home/troll/Downloads
[troll@standalone Downloads]$ #查看下载文件
[troll@standalone Downloads]$ ll
total 187260
-rw-rw-r–. 1 troll troll 191753373 Oct 22 17:01 jdk-8u191-linux-x64.tar.gz
[troll@standalone Downloads]$ #当前目录
[troll@standalone Downloads]$ pwd
/home/troll/Downloads

解压jdk

假设安装目录为/home/troll/softs/
[troll@standalone Downloads]$ tar -zxvf jdk-8u191-linux-x64.tar.gz -C /home/troll/softs/
#查看解压情况
[troll@standalone Downloads]$ ll /home/troll/softs/
total 4
drwxr-xr-x. 7 troll troll 245 Oct 6 20:55 jdk1.8.0_191

查看是否系统自带jdk

[troll@standalone Downloads]$ #查看系统是否已经安装jdk
[troll@standalone Downloads]$ rpm -qa | grep java
python-javapackages-3.4.1-11.el7.noarch
java-1.7.0-openjdk-headless-1.7.0.191-2.6.15.4.el7_5.x86_64
tzdata-java-2018e-3.el7.noarch
java-1.8.0-openjdk-headless-1.8.0.181-3.b13.el7_5.x86_64
java-1.8.0-openjdk-1.8.0.181-3.b13.el7_5.x86_64 #
javapackages-tools-3.4.1-11.el7.noarch
java-1.7.0-openjdk-1.7.0.191-2.6.15.4.el7_5.x86_64

卸载系统自带jdk

sudo rpm -e java-1.7.0-openjdk
sudo rpm -e icedtea-web #依赖
sudo rpm -e rhino #依赖
sudo rpm -e jline #依赖
sudo rpm -e java-1.8.0-openjdk-headless
sudo rpm -e java-1.8.0-openjdk

#检查系统自带jdk是否卸载完成
[troll@standalone Downloads]$ rpm -qa | grep java
[troll@standalone Downloads]$

#配置jdk环境变量
注意：
全局java环境变量设置/etc/profile
当前用户java环境变量设置~/.bash_profile
[troll@standalone jdk1.8.0_191] $KaTeX parse error: Expected 'EOF', got '#' at position 21: \dots/etc/profile`` #̲用户java环境变量设置 [t\dots$ vi ~/.bash_profile

	#java env
	JAVA_HOME=/home/troll/softs/jdk1.8.0_191
	CLASSPATH=$JAVA_HOME/lib
	PATH=$JAVA_HOME/bin:$PATH
	export JAVA_HOME CLASSPATH PATH

#引用环境变量
source ~/.bash_profile

#测试安装是否成功

[troll@standalone jdk1.8.0_191]$ java -version
java version "1.8.0_191"
Java(TM) SE Runtime Environment (build 1.8.0_191-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.191-b12, mixed mode)

部署成功