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CentOS 7 安裝成功后可能已經默認安裝了OpenJDK的JRE，但平時進行JAVA開發時需要用完整的JDK，所以為了避免以后不必要的麻煩，在此卸載了OpenJDK的JRE，并重新安裝了Oracle的JDK8
系統環境：CentOS 7
安裝方式：rpm
安裝包：jdk-8u131-linux-x64.rpm
[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 ~]$
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身份運行以下命令
[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
[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默認安裝到了 /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]#
[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]#
[hadoop@centos7-1 ~]$ whoami hadoop [hadoop@centos7-1 ~]$ vi ~/.bashrc
設置JAVA_HOME，并將它加到PATH中
JAVA_HOME=/usr/java/default PATH=$PATH:$JAVA_HOME/bin export JAVA_HOME PATH
運行source命令，使修改生效。輸出JAVA_HOME, PATH確認修改是否生效。
[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上安裝JDK8順利完畢，更多關于linux下安裝JDK的文章請查看下面相關鏈接
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