CentOS 7 jdk8安装说明

1、 检查原版本
java  –version



如果有旧版本进一步查看JDK信息
rpm -qa | grep java



删除旧版本，noarch可以不删除
rpm -e --nodeps java-1.7.0-openjdk-1.7.0.141-2.6.10.5.el7.x86_64
rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.131-11.b12.el7.x86_64
rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.141-2.6.10.5.el7.x86_64
rpm -e --nodeps java-1.8.0-openjdk-1.8.0.131-11.b12.el7.x86_64 
rpm -e --nodeps tzdata-java-2017b-1.el7.noarch

检查是否删除成功



2、 下载rpm文件
wget --no-check-certificate --no-cookie --header "Cookie:s_nr=1468221561528;s_cc=true;oraclelicense=accept-securebackup-cookie;gpw_e24=http%3A%2F%2Fwww.oracle.com%2Ftechnetwork%2Fjava%2Fjavase%2Fdownloads%2Fjdk8-downloads-2133151.html;s_sq=us%25253A%25252Fjava%25252Fjavase%25252Fdownloads%25252Fjdk8-downloads-2133151.html%2526pidt%253D1%2526oid%253Dfunctiononclick(event)%25257BacceptAgreement(window.self%25252C'jdk-8u91-oth-JPR')%25253B%25257D%2526oidt%253D2%2526ot%253DRADIO" http://download.oracle.com/otn-pub/java/jdk/8u151-b12/e758a0de34e24606bca991d704f6dcbf/jdk-8u151-linux-x64.rpm



3、 安装jdk
rpm -ivh jdk-8u151-linux-x64.rpm



输入命令:java    javac    java –version看看是否安装成功

4、 配置环境变量
vi /etc/profile



在profile里面加入如下内容
JAVA_HOME=/usr/java/jdk1.8.5_151
JRE_HOME=/usr/java/jdk1.8.0_151/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
 
修改生效：source /etc/profile
查看系统环境：echo $PATH