1.先检查自带的java，有的话就先卸载
[root@localhost ~]# rpm -qa |grep java
javassist-3.16.1-10.el7.noarch
javamail-1.4.6-8.el7.noarch
httpcomponents-core-javadoc-4.2.4-6.el7.noarch
httpunit-javadoc-1.7-15.el7.noarch
python-javapackages-3.4.1-11.el7.noarch
xz-java-1.3-3.el7.noarch
tzdata-java-2019c-1.el7.noarch
httpcomponents-client-javadoc-4.2.5-5.el7_0.noarch
java-1.7.0-openjdk-1.7.0.251-2.6.21.0.el7_7.x86_64
javapackages-tools-3.4.1-11.el7.noarch
2.卸载自带的java环境
[root@localhost ~]# for i in {java-1.7.0-openjdk-headless-1.7.0.251-2.6.21.0.el7_7.x86_64,java-1.8.0-openjdk-devel-1.8.0.242.b08-0.el7_7.x86_64,java-1.8.0-openjdk-headless-1.8.0.242.b08-0.el7_7.x86_64,java-1.8.0-openjdk-1.8.0.242.b08-0.el7_7.x86_64,java-1.7.0-openjdk-1.7.0.251-2.6.21.0.el7_7.x86_64};do rpm -e $i --nodeps; done
3.拉入jdk1.8的二进制包
链接结尾分享
[root@localhost ~]# ls
anaconda-ks.cfg initial-setup-ks.cfg jdk-8u131-linux-x64.tar.gz
[root@localhost ~]# tar zxvf jdk-8u131-linux-x64.tar.gz -C /usr/local/
[root@localhost ~]# mv /usr/local/jdk1.8.0_131\ / /usr/local/java
4.配置环境变量
[root@localhost ~]# echo -e "PATH=$PATH:/usr/local/java/bin:/usr/local/java/jre/bin" >> /etc/profile
[root@localhost ~]# source /etc/profile
[root@localhost ~]# java -version
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)
5.配置完毕
