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

安装包：

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-0.4.9-4.el7.noarch
tzdata-java-2017b-1.el7.noarch
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-0.4.9-4.el7.noarch
javapackages-tools-3.4.1-11.el7.noarch
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-3.4.1-11.el7.noarch
[hadoop@centos7-1 ~]$ 

3.卸载系统已安装的openjdk

libvirt-java-devel-0.4.9-4.el7.noarch
libvirt-java-0.4.9-4.el7.noarch
tzdata-java-2017b-1.el7.noarch
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-0.4.9-4.el7.noarch
[root@centos7-1 hadoop]# rpm -e --nodeps libvirt-java-0.4.9-4.el7.noarch
[root@centos7-1 hadoop]# rpm -e --nodeps tzdata-java-2017b-1.el7.noarch
[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 
 preparing...             ################################# [100%]
 updating / installing...
  1:jdk1.8.0_131-2000:1.8.0_131-fcs ################################# [100%]
 unpacking jar files...
  tools.jar...
  plugin.jar...
  javaws.jar...
  deploy.jar...
  rt.jar...
  jsse.jar...
  charsets.jar...
  localedata.jar...
[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 $java_home
/usr/java/default
[hadoop@centos7-1 ~]$ 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