安装步骤

1、卸载openJDK

1.1 查看当前Linux系统是否安装java,卸载openjdk

yum -y remove *openjdk*rpm -qa | grep java

1.2 卸载系统中已经存在的openJDK

rpm -e --nodeps + 包名

2、在/usr/local目录下创建java目录

mkdir -p /usr/local/java

3、上传JDK到Linux系统

4、解压jdk

tar -zxvf jdk-8u161-linux-x64.tar.gz -C /usr/local/java/

5、配置Jdk环境变量

cat >> /etc/profile << "EOF"
export JAVA_HOME=/usr/local/java/jdk1.8.0_371
export PATH=.:$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
EOF

6、重新加载/etc/profile文件，让配置生效

source /etc/profile

7、测试安装是否成功

[root@localhost mysoft]# java -version
java version "1.8.0_161"
Java(TM) SE Runtime Environment (build 1.8.0_161-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.161-b12, mixed mode)