1.centos7 默認(rèn)安裝的jdk?
pm -qa | grep java
2.卸載默認(rèn)的jdk
rpm -e --nodeps tzdata-java-2014i-1.el7.noarch
rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.71-2.5.3.1.el7_0.x86_64
3.上傳新的jdk
4.解壓
tar -zxvf jdk-8u121-linux-x64.tar.gz
5.配環(huán)境變量
vi /etc/profile
#set java environment
JAVA_HOME=/usr/jdk1.8.0_121
JRE_HOME=/usr/jdk1.8.0_121/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
6.文件生效
source /etc/profile
7.驗(yàn)證
Java -version
