CentOS7上以rpm⽅式安装JDK8
CentOS 7 安装成功后可能已经默认安装了OpenJDK的JRE，但平时进⾏JAVA开发时需要⽤完整的JDK，所以为了避免以后不必要的⿇烦，在此卸载了OpenJDK的JRE，并重新安装了Oracle的JDK8
1.安装说明
系统环境：CentOS 7
安装⽅式：rpm
2.检查系统原安装版本
[hadoop@centos7-1 ~]$ java -version
OpenJDK Version "1.8.0_131"
OpenJDK Runtime Environment (build 1.8.0_131-b12)
OpenJDK 64-Bit Server VM (build 25.131-b12, mixed mode)
[hadoop@centos7-1 ~]$ rpm -qa|grep java
libvirt-java-devel-0.4.arch
arch
java-1.8.0-openjdk-headless-1.8.0.131-3.b12.el7_3.x86_64
java-1.7.0-openjdk-1.7.0.141-2.6.10.1.el7_3.x86_64
libvirt-java-0.4.arch
javapackages-tools-3.4.arch
java-1.7.0-openjdk-headless-1.7.0.141-2.6.10.1.el7_3.x86_64
java-1.8.0-openjdk-1.8.0.131-3.b12.el7_3.x86_64
python-javapackages-3.4.arch
[hadoop@centos7-1 ~]$
3.卸载系统已安装的openjdk
libvirt-java-devel-0.4.arch
libvirt-java-0.4.arch
arch
java-1.8.0-openjdk-headless-1.8.0.131-3.b12.el7_3.x86_64
java-1.7.0-openjdk-1.7.0.141-2.6.10.1.el7_3.x86_64
java-1.7.0-openjdk-headless-1.7.0.141-2.6.10.1.el7_3.x86_64
java-1.8.0-openjdk-1.8.0.131-3.b12.el7_3.x86_64
以root⾝份运⾏以下命令
[root@centos7-1 hadoop]# rpm -e --nodeps libvirt-java-devel-0.4.arch
[root@centos7-1 hadoop]# rpm -e --nodeps libvirt-java-0.4.arch
[root@centos7-1 hadoop]# rpm -e --nodeps arch
[root@centos7-1 hadoop]# rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.141-2.6.10.1.el7_3.x86_64
[root@centos7-1 hadoop]# rpm -e --nodeps java-1.7.0-openjdk-1.7.0.141-2.6.10.1.el7_3.x86_64
[root@centos7-1 hadoop]# rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.131-3.b12.el7_3.x86_64
[root@centos7-1 hadoop]# rpm -e --nodeps java-1.8.0-openjdk-1.8.0.131-3.b12.el7_3.x86_64
4.安装jdk
[root@centos7-1 local]# ll /usr/local/jdk-8u131-linux-x64.rpm
-rw-r--r--. 1 root root 169983496 6⽉ 12 23:17 /usr/local/jdk-8u131-linux-x64.rpm
[root@centos7-1 local]# rpm -ivh jdk-8u131-linux-x64.rpm
< >>>>>>### [100%]
Updating /
1:jdk1.8.0_131-2000:1.8.0_131-fcs >>>>>>### [100%]
Unpacking
[root@centos7-1 local]#
jdk默认安装到了 /usr/java/ 下⾯
[root@centos7-1 local]# ll /usr/java/
total 0
lrwxrwxrwx. 1 root root 16 6⽉ 12 23:18 default -> /usr/java/latest
drwxr-xr-x. 9 root root 268 6⽉ 12 23:18 jdk1.8.0_131
lrwxrwxrwx. 1 root root 22 6⽉ 12 23:18 latest -> /usr/java/jdk1.8.0_131
[root@centos7-1 local]#
5.验证安装
[root@centos7-1 local]# ll /usr/bin/java
lrwxrwxrwx. 1 root root 22 6⽉ 12 23:18 /usr/bin/java -> /etc/alternatives/java
[root@centos7-1 local]# ll /etc/alternatives/java
lrwxrwxrwx. 1 root root 35 6⽉ 12 23:18 /etc/alternatives/java -> /usr/java/jdk1.8.0_131/jre/bin/java
[root@centos7-1 local]# 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)
[root@centos7-1 local]#
6.配置环境变量
[hadoop@centos7-1 ~]$ whoami
hadoop
[hadoop@centos7-1 ~]$ vi ~/.bashrc
设置JAVA_HOME，并将它加到PATH中
JAVA_HOME=/usr/java/default
PATH=$PATH:$JAVA_HOME/bin
export JAVA_HOME PATH
运⾏source命令，使修改⽣效。输出JAVA_HOME, PATH确认修改是否⽣效。
[hadoop@centos7-1 ~]$ source ~/.bashrc
[hadoop@centos7-1 ~]$ echo $JAVA_HOME
linux安装jdk18并配置环境变量/usr/java/default
[hadoop@centos7-1 ~]$ echo $PATH
/usr/lib64/qt-3.3/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin:/home/hadoop/.local/bin:/home/hadoop/bin:/usr/java/default/bin ⾄此，CentOS 7上安装JDK8顺利完毕，更多关于linux下安装JDK的⽂章请查看下⾯相关链接
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