1、下载

下载地址 

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# wget http://download.oracle.com/otn-pub/java/jdk/8u162-b12/0da788060d494f5095bf8624735fa2f1/jdk-8u162-linux-x64.tar.gz?AuthParam=1523500645_d9da6782456ccdb75259e60e0ff52793

2、解压,并改名

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[root@sing soft]# tar -zxvf jdk-8u162-linux-x64.tar.gz\?AuthParam\=1523500645_d9da6782456ccdb75259e60e0ff52793
[root@sing local]# mv jdk-8u162-linux-x64.tar.gz\?AuthParam\=1523500645_d9da6782456ccdb75259e60e0ff52793 jdk1.8

3、移动

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[root@sing local]# cp -r jdk1.8/ /usr/local/

4、设置环境变量

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[root@localhost java]# vi /etc/profile

在profile中添加如下内容:

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#set java environment
JAVA_HOME=/usr/local/jdk1.8
JRE_HOME=$JAVA_HOME/jre
CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
export JAVA_HOME JRE_HOME CLASS_PATH PATH

让修改生效:

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[root@localhost java]# source /etc/profile

5、验证JDK有效性

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[root@sing local]#  java -version
java version "1.8.0_162"
Java(TM) SE Runtime Environment (build 1.8.0_162-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.162-b12, mixed mode)