CentOS7 安装 java 环境

1. 官网下载jdk压缩包

$ wget https://download.oracle.com/java/18/latest/jdk-18_linux-x64_bin.tar.gz

2. 解压并移动至/usl/local/java目录下

$ tar -zxvf jdk-18_linux-x64_bin.tar.gz 
$ mkdir /usr/local/java
$ mv jdk-18.0.1.1 /usr/local/java/

3. 配置环境变量，在profile文件最后面加入以下内容

$ vi /etc/profile

JAVA_HOME=/usr/local/java/jdk-18.0.1.1
CLASSPATH=.:$JAVA_HOME/lib
PATH=$JAVA_HOME/bin:$PATH
export JAVA_HOME CLASSPATH PATH

4. 加载环境变量

$ source /etc/profile

5. 查询java版本

$ java -version

java version "18.0.1.1" 2022-04-22
Java(TM) SE Runtime Environment (build 18.0.1.1+2-6)
Java HotSpot(TM) 64-Bit Server VM (build 18.0.1.1+2-6, mixed mode, sharing)