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：jdk-8u131-linux-x64.rpm

2.检查系统原安装版本

[hadoop@centos7-1 ~]$ java -versionOpenJDK 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 javalibvirt-java-devel-0.4.9-4.el7.noarchtzdata-java-2017b-1.el7.noarchjava-1.8.0-openjdk-headless-1.8.0.131-3.b12.el7_3.x86_64java-1.7.0-openjdk-1.7.0.141-2.6.10.1.el7_3.x86_64libvirt-java-0.4.9-4.el7.noarchjavapackages-tools-3.4.1-11.el7.noarchjava-1.7.0-openjdk-headless-1.7.0.141-2.6.10.1.el7_3.x86_64java-1.8.0-openjdk-1.8.0.131-3.b12.el7_3.x86_64python-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.noarchlibvirt-java-0.4.9-4.el7.noarchtzdata-java-2017b-1.el7.noarchjava-1.8.0-openjdk-headless-1.8.0.131-3.b12.el7_3.x86_64java-1.7.0-openjdk-1.7.0.141-2.6.10.1.el7_3.x86_64java-1.7.0-openjdk-headless-1.7.0.141-2.6.10.1.el7_3.x86_64java-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 0lrwxrwxrwx. 1 root root 16 6月 12 23:18 default -> /usr/java/latestdrwxr-xr-x. 9 root root 268 6月 12 23:18 jdk1.8.0_131lrwxrwxrwx. 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/javalrwxrwxrwx. 1 root root 22 6月 12 23:18 /usr/bin/java -> /etc/alternatives/java[root@centos7-1 local]# ll /etc/alternatives/javalrwxrwxrwx. 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 -versionjava 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 ~]$ whoamihadoop[hadoop@centos7-1 ~]$ vi ~/.bashrc

设置JAVA_HOME，并将它加到PATH中

JAVA_HOME=/usr/java/defaultPATH=$PATH:$JAVA_HOME/binexport 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