1.检查一下系统中是否已安装jdk
[root@localhost local]# java -version
如果显示如下,则需要卸载。
openjdk version "1.8.0_102"
OpenJDK Runtime Environment (build 1.8.0_102-b14)
OpenJDK 64-Bit Server VM (build 25.102-b14, mixed mode)
查看已安装的jdk安装包
[root@localhost local]# rpm -qa | grep java
java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64
python-javapackages-3.4.1-11.el7.noarch
tzdata-java-2016g-2.el7.noarch
javapackages-tools-3.4.1-11.el7.noarch
java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64
java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64
java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64
卸载openjdk
[root@localhost local]# rpm -e --nodeps tzdata-java-2016g-2.el7.noarch
[root@localhost local]# rpm -e --nodeps java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64
[root@localhost local]# rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64
[root@localhost local]# rpm -e --nodeps java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64
[root@localhost local]# rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64
2.安装新的jdk
使用xfpt工具将安装包 jdk-8u161-linux-x64.tar.gz上传到 /usr/local/ 目录,将其减压。
[root@localhost local]# tar -zxvf jdk-8u161-linux-x64.tar.gz
配置环境变量
[root@localhost local]# vi /etc/profile
在最后添加如下代码
export JAVA_HOME=/usr/local/jdk-8u161-linux-x64
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH
使配置生效
[root@localhost local]# source /etc/profile
3.查看jdk版本,显示如下信息表示jdk安装配置完成。
[root@localhost local]# java -version
java version "1.8.0_161"
Java(TM) SE Runtime Environment (build 1.8.0_161-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.161-b12, mixed mode)