Centos下安装制定Java版本

## 下载需要的版本

## 上传java包到服务器, 并解压

> [centos@localhost jvm]$ sudo tar -xf jdk-8u221-linux-x64.tar.gz [centos@localhost jvm]$ ls jdk1.8.0_221 jdk-8u221-linux-x64.tar.gz [centos@localhost jvm]$ ls jdk1.8.0_221 bin lib src.zip COPYRIGHT LICENSE THIRDPARTYLICENSEREADME-JAVAFX.txt include man THIRDPARTYLICENSEREADME.txt javafx-src.zip README.html jre release

## 将文件拷贝到/usr/lib/jvm

[centos@localhost jvm]$ sudo mkdir /usr/lib/jvm [centos@localhost jvm]$ sudo cp -r jdk1.8.0_221 /usr/lib/jvm

## 修改.profile文件

[centos@localhost jvm]$ cd ~ [centos@localhost ~]$ sudo vi .profile [centos@localhost ~]$ cat .profile export JAVA_HOME=/usr/lib/jvm/jdk1.8.0_221 export JRE_HOME=${JAVA_HOME}/jre export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib export PATH=${JAVA_HOME}/bin:$PATH

## 生效.profile文件

> [centos@localhost ~]$ source .profile

## 创建软连接

[centos@localhost ~]$ whereis java java: /usr/lib/jvm/jdk1.8.0_221/bin/java [centos@localhost ~]$ sudo ln -s /usr/lib/jvm/jdk1.8.0_221/bin/java /usr/bin/java [centos@localhost ~]$ whereis java java: /usr/bin/java /usr/lib/jvm/jdk1.8.0_221/bin/java [centos@localhost ~]$ 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)