因为使用的是Centos所以安装JDK,先从官网下载
http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
找到安装包
下载到本地。
1.在服务器/usr/目录下创建java目录
[root@localhost ~]# mkdir/usr/java [root@localhost ~]# cd /usr/java [root@localhost java]# tar -zxvf jdk-8u121-linux-x64.tar.gz
2.设置环境变量
[root@localhost java]# vi /etc/profile
JAVA_HOME=/usr/java/jdk1.8.0_121 JRE_HOME=/usr/java/jdk1.8.0_121/jre CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin export JAVA_HOME JRE_HOME CLASS_PATH PATH
3.卸载Centos默认安装的openjdk
java -version
java version "1.8.0_24"
OpenJDK Runtime Environment (build 1.8.0_24-b18)
OpenJDK HotSpot(TM) Client VM (build 24.45-b08, mixed mode, sharing)
进一步查看JDK信息
[root@localhost ~]# rpm -qa | grep java
tzdata-java-2012c-1.el6.noarch
java-1.7.0-openjdk-1.7.0.45-1.45.1.11.1.el6.x86_64
卸载OpenJDK,执行以下操作:
[root@localhost ~]# rpm -e --nodeps tzdata-java-2012c-1.el6.noarch
[root@localhost ~]# rpm -e --nodeps java-1.8.0-openjdk-1.8.0.45-1.45.1.11.1.el6.x86_64
4.让之前的配置生效
[root@localhost ~]#source /etc/profile
5.查看是否生效
java -version java version "1.8.0_121" java(TM) SE Runtime Environment(build 1.8.0_121-b13) java HotSpot(TM) 64-Bit Server VM(build 25.121-b13,mixed mode)如上,配置完成