Linux Java

CentOS 6.5 jdk-8u162-linux-x64.tar.gz


可通过查看java版本判断当前是否安装了jdk

# java -version
# java -version
java version "1.7.0_99"
OpenJDK Runtime Environment (rhel-2.6.5.1.el6-x86_64 u99-b00)
OpenJDK 64-Bit Server VM (build 24.95-b01, mixed mode)  


查看安装的jdk包


# rpm -qa |grep jdk
java-1.6.0-openjdk-1.6.0.38-1.13.10.4.el6.x86_64
java-1.7.0-openjdk-1.7.0.99-2.6.5.1.el6.x86_64


可通过 rpm -e --nodeps java-x.x.x-... 卸载已经安装的jdk。


# rpm -e --nodeps java-1.6.0-openjdk-1.6.0.38-1.13.10.4.el6.x86_64
# rpm -e --nodeps java-1.7.0-openjdk-1.7.0.99-2.6.5.1.el6.x86_64
# rpm -qa |grep jdk
# 



解压jdk-8u162-linux-x64.tar.gz

# tar -zxvf jdk-8u162-linux-x64.tar.gz

复制或剪切解压后文件到需要的位置 (/usr/local/jdk/)

mv jdk1.8.0_162/ /usr/local/jdk/
配置环境变量,编辑 /etc/profile 末尾增加

export JAVA_HOME=/usr/local/jdk/jdk1.8.0_162
export PATH=$JAVA_HOME/bin:$PATH

保存退出,使配置生效:

# source /etc/profile

验证


# java -version
java version "1.8.0_162"
Java(TM) SE Runtime Environment (build 1.8.0_162-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.162-b12, mixed mode)




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