【解压】
#tar xvzf jdk-8u321-linux-x64.tar.gz
【目录改名,目的是短名好记】
#mv jdk1.8.0_321/ jdk18
#mv jdk18/ jdk8
实际改了两次,完全可以一次改好的
【建立目录/usr/local/java,目的是为了容纳更多的java版本】
[root@localhost ~]# cd /usr
[root@localhost usr]# cd local/
[root@localhost local]# ls
bin etc games include lib lib64 libexec sbin share src
[root@localhost local]# mkdir java
【移动~/jdk到/usr/local/java】
[root@localhost local]# cd ~
[root@localhost ~]# ls
anaconda-ks.cfg initial-setup-ks.cfg jdk8 jdk-8u321-linux-x64.tar.gz
[root@localhost ~]# mv jdk8 /usr/local/java
【更改/etc/profile并刷新】
[root@localhost ~]# vi /etc/profile
把下面一段写到文件末尾
export JAVA_HOME=/usr/local/java/jdk8 export JRE_HOME=${JAVA_HOME}/jre export CLASSPATH=.:{JAVA_HOME}/lib:${JRE_HOME}/lib:${CLASSPATH} export JAVA_PATH=${JAVA_HOME}/bin:${JRE_HOME}/bin export PATH=${PATH}:${JAVA_HOME}/bin
然后刷新两次
[root@localhost ~]# source /etc/profile
[root@localhost ~]# source /etc/profile
【做软链接】
注意原来的java不要删除,请用mv命令给它一个准确的名字存放好,比如说opensdk_1.8.0_262这样
[root@localhost bin]# ln -s /usr/local/java/jdk8/bin/java /bin/java
然后就可以检验了:
[root@localhost bin]# java -version
java version "1.8.0_321"
Java(TM) SE Runtime Environment (build 1.8.0_321-b07)
Java HotSpot(TM) 64-Bit Server VM (build 25.321-b07, mixed mode)
[root@localhost bin]# cd ~
[root@localhost ~]# java -version
java version "1.8.0_321"
Java(TM) SE Runtime Environment (build 1.8.0_321-b07)
Java HotSpot(TM) 64-Bit Server VM (build 25.321-b07, mixed mode)
参考文档:https://www.cnblogs.com/heyang78/p/15903810.html
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