linux环境下jdk搭建

jdk搭建

1.查看可安装版本

 yum search java | grep -i --color JDK

2.安装指定版本JDK

默认安装至/usr/lib/jvm下

yum install java-1.8.0-openjdk java-1.8.0-openjdk-devel

3.查看安装情况

查看安装版本

java -version

查看安装目录

[root@localhost home]# cd /usr/lib/jvm
[root@localhost jvm]# ll
total 0
lrwxrwxrwx. 1 root root  26 Feb 28 16:55 java -> /etc/alternatives/java_sdk
lrwxrwxrwx. 1 root root  32 Feb 28 16:55 java-1.8.0 -> /etc/alternatives/java_sdk_1.8.0
lrwxrwxrwx. 1 root root  40 Feb 28 16:55 java-1.8.0-openjdk -> /etc/alternatives/java_sdk_1.8.0_openjdk
drwxr-xr-x. 9 root root 176 Feb 28 16:56 java-1.8.0-openjdk-1.8.0.322.b06-1.el7_9.x86_64
lrwxrwxrwx. 1 root root  34 Feb 28 16:55 java-openjdk -> /etc/alternatives/java_sdk_openjdk
lrwxrwxrwx. 1 root root  21 Feb 28 16:55 jre -> /etc/alternatives/jre
lrwxrwxrwx. 1 root root  27 Feb 28 16:55 jre-1.8.0 -> /etc/alternatives/jre_1.8.0
lrwxrwxrwx. 1 root root  35 Feb 28 16:55 jre-1.8.0-openjdk -> /etc/alternatives/jre_1.8.0_openjdk
lrwxrwxrwx. 1 root root  51 Feb 28 16:55 jre-1.8.0-openjdk-1.8.0.322.b06-1.el7_9.x86_64 -> java-1.8.0-openjdk-1.8.0.322.b06-1.el7_9.x86_64/jre
lrwxrwxrwx. 1 root root  29 Feb 28 16:55 jre-openjdk -> /etc/alternatives/jre_openjdk

4.配置环境变量

[root@localhost jvm]# vim /etc/profile
#java
export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.322.b06-1.el7_9.x86_64
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/jre/lib/dt.jar:$JAVA_HOME/lib/tool.jar
export PATH=$PATH:$JAVA_HOME/bin

5.使配置生效

[root@localhost jvm]# source /etc/profile