Centos下源码安装JDK1.8

1、在命令行输入如下命令，查看系统默认的jdk
rpm -qa | grep java

2.删除默认的openjdk
rpm -e --nodeps java-*

3.验证删除
java --version

4.输入命令下载
wget  http://download.oracle.com/otn-pub/java/jdk/8u191-b12/2787e4a523244c269598db4e85c51e0c/jdk-8u191-linux-x64.tar.gz

5.解压
tar -zxvf jdk-8u191-linux-x64.tar.gz


6.配置JDK环境变量
vim /etc/profile

JAVA_HOME=/usr/local/java/1.8.0_51

JRE_HOME=/usr/local/java/1.8.0_51 /jre

PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib

export JAVA_HOME JRE_HOME PATH CLASSPATH

 

source /etc/profile