之前以为有记录过jdk的安装(然而并没有)。现在重新记录一下:
参考博客:https://www.cnblogs.com/Dylansuns/p/6974272.html
一、查看是否有安装JDK
java -version显示:
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)二、检测jdk安装包
rpm -qa | grep java显示:
python-javapackages-3.4.1-6.el7_0.noarch tzdata-java-2015a-1.el7.noarch javapackages-tools-3.4.1-6.el7_0.noarch三、卸载jdk
我使用的卸载方式:
yum remove *openjdk*其它卸载方式( 未亲测)
rpm -e --nodeps tzdata-java-2016g-2.el7.noarch rpm -e --nodeps java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64 rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64 rpm -e --nodeps java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64 rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64查看卸载情况:
rpm -qa | grep java四、安装新的JDK
在官网下载JDK:http://www.oracle.com/technetwork/java/javase/downloads/index.html
解压压缩包
tar -zxvf jdk-8u161-linux-x64.tar.gz
修改
profile文件(目录:/etc/profile),添加如下部分
# /etc/profile # System wide environment and startup programs, for login setup # Functions and aliases go in /etc/bashrc # It's NOT a good idea to change this file unless you know what you # are doing. It's much better to create a custom.sh shell script in # /etc/profile.d/ to make custom changes to your environment, as this # will prevent the need for merging in future updates. #-----------------以下是添加部分--------------------------------- JAVA_HOME=/usr/java/jdk1.8.0_161 CLASSPATH=$JAVA_HOME/lib/ PATH=$PATH:$JAVA_HOME/bin export PATH JAVA_HOME CLASSPATH #-----------------以上是添加部分--------------------------------- pathmunge () { case ":${PATH}:" in *:"$1":*) ;; *) if [ "$2" = "after" ] ; then PATH=$PATH:$1 else PATH=$1:$PATH fi esac } #下面部分省略执行profile文件
source /etc/profile查看新安装的JDK
java -version安装结束