安装java jdk环境jdk1.8

1) yum 安装java jdk 1.8

* -y

验证java

[root@localhost local]# java -version
openjdk version "1.8.0_222"
OpenJDK Runtime Environment (build 1.8.0_222-b10)
OpenJDK -Bit Server VM (build 25.222-b10, mixed mode)
[root@localhost local]# javac -version
javac 1.8.0_222

2） 编译安装 java jdk1.8

a) 官网下载页面是http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

找到合适的源码包，笔者选的是linux 64位 tar.gz格式源码文件包

登录Oracle账号

b) 源码包解压到/usr/local/

cd /usr/local/
wget '刚才复制的下载链接地址'
tar zxvf jdk-8u221-*

解压后的文件名是jdk1.8.0_221, 可以做一个软连接

.0_221/ jdk1.

c) 配置java环境变量/etc/profile

echo 'export JAVA_HOME=/usr/local/jdk1.8/' >> /etc/profile
echo 'export PATH=$PATH:$JAVA_HOME/bin' >> /etc/profile
echo 'export CLASSPATH=.:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar:$CLASSPATH' >> /etc/profile
source /etc/profile

d) 验证一下Java环境是否正常,没有报错就是正常

[root@localhost ~]# java -version
openjdk version "1.8.0_221"
OpenJDK Runtime Environment (build 1.8.0_221-b04)
OpenJDK -Bit Server VM (build 25.221-b04, mixed mode)
[root@localhost ~]# javac -version
javac 1.8.0_221