CentOS7安装JDK1.8

1. 解压jdk -zxvf jdk-8u121-linux-x64.tar.gz
2. 查看已安装的jdk
   [zyf@localhost soft]$ java -version
   openjdk version “1.8.0_102”
   OpenJDK Runtime Environment (build 1.8.0_102-b14)
   OpenJDK 64-Bit Server VM (build 25.102-b14, mixed mode)
   [zyf@localhost soft]$ rpm -qa | grep java
   java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64
   javapackages-tools-3.4.1-11.el7.noarch
   java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64
   java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64
   tzdata-java-2016g-2.el7.noarch
   python-javapackages-3.4.1-11.el7.noarch
   java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64
3. 卸载OpenJDK
   [zyf@localhost soft]$ rpm -e –nodepsjava-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64
   错误：can’t create 事务 lock on /var/lib/rpm/.rpm.lock (权限不够)
   [zyf@localhost soft]$ su
   密码：
   提示权限不足，登陆root用户继续卸载
   [root@localhost soft]# rpm -e –nodepsjava-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64
   [root@localhost soft]# rpm -e –nodepsjava-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64
   [root@localhost soft]# rpm -e –nodepsjava-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64
   [root@localhost soft]# rpm -e –nodepstzdata-java-2016g-2.el7.noarch
4. 安装JDK，只需要将最初解压的目录放到想要安装的位置即可
   配置环境变量
   [root@localhost soft]# vim /etc/profile
   在文件最后添加如下配置
   /#jdk环境变量
   JAVA_HOME=/home/zyf/work/soft/jdk1.8.0_121
   JRE_HOME=/home/zyf/work/soft/jdk1.8.0_121/jre
   CLASSPATH=.:JAVAHOME/lib/dt.jar:JAVA_HOME/lib/tools.jar:JREHOME/libPATH=PATH:JAVAHOME/bin:JRE_HOME/bin
   export JAVA_HOME JRE_HOME PATH CLASSPATH
   使修改立即生效
   [root@localhost soft]# source /etc/profile
   查看系统环境状态
   [root@localhost soft]# echo $PATH
   /usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin:/home/zyf/.local/bin:/home/zyf/bin:/home/zyf/work/soft/jdk1.8.0_121/bin:/home/zyf/work/soft/jdk1.8.0_121/jre/bin
5. 安装完成，可以通过java命令查看安装是否成功
   java
   javac
   java-version

转载地址： centos7安装jdk1.8