Linux 安装Jdk环境
jdk下载地址:https://www.oracle.com/technetwork/java/javase/archive-139210.html
1.检查Linux系统是否安装有jdk
[root@kk download]# java -version
openjdk version "1.8.0_232"
OpenJDK Runtime Environment (build 1.8.0_232-b09)
OpenJDK 64-Bit Server VM (build 25.232-b09, mixed mode)
2.查找Linux系统中的java文件
[root@kk download]# rpm -qa | grep java
python-javapackages-3.4.1-11.el7.noarch
java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64
javapackages-tools-3.4.1-11.el7.noarch
java-1.8.0-openjdk-headless-1.8.0.232.b09-0.el7_7.x86_64
java-1.8.0-openjdk-headless-debug-1.8.0.232.b09-0.el7_7.x86_64
java-1.8.0-openjdk-devel-debug-1.8.0.232.b09-0.el7_7.x86_64
tzdata-java-2019c-1.el7.noarch
java-1.8.0-openjdk-debug-1.8.0.232.b09-0.el7_7.x86_64
3.卸载系统自带的jdk,检查卸载效果
[root@kk download]# rpm -e --nodeps java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64 [root@kk download]# rpm -e --nodeps javapackages-tools-3.4.1-11.el7.noarch [root@kk download]# rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.232.b09-0.el7_7.x86_64 [root@kk download]# rpm -e --nodeps java-1.8.0-openjdk-headless-debug-1.8.0.232.b09-0.el7_7.x86_64 [root@kk download]# rpm -e --nodeps java-1.8.0-openjdk-devel-debug-1.8.0.232.b09-0.el7_7.x86_64 [root@kk download]# rpm -e --nodeps java-1.8.0-openjdk-debug-1.8.0.232.b09-0.el7_7.x86_64
yan 证
[root@kk download]# rpm -qa |grep java python-javapackages-3.4.1-11.el7.noarch tzdata-java-2019c-1.el7.noarch
4.解压jdk,进入java目录查看解压效果
cd /usr/local/java # 解压JDK压缩包 tar -zxvf jdk-8u181-linux-x64.tar.gz # 解压完成后,删除压缩包 rm -f jdk-8u181-linux-x64.tar.gz
5.配置java环境变量,刷新配置
获取jdk安装的绝对路径,作为标识JAVA_HOME
获取jre安装的绝对路径,作为标识JRE_HOME
打开环境变量配置文件:
vi /etc/profile
具体配置:
JAVA_HOME=/usr/local/java/jdk1.8.0_221 JRE_HOME=/usr/local/java/jdk1.8.0_221/jre CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin export JAVA_HOME JRE_HOME CLASS_PATH PATH
刷新环境变量:
[root@kk opt]# source /etc/profile
6.检查java安装效果
[root@kk opt]# java -version
java version "1.8.0_221"
Java(TM) SE Runtime Environment (build 1.8.0_221-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.221-b11, mixed mode)
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