Centos安裝jdk8

1.下載jdk1.8的tar

  cd /usr/local/src #切換到該目錄下
  wget url #下載jdk8的tar包

2.下載完成後解壓tar包

  tar -zxvf jdk-8u152-linux-x64.tar.gz

3.解壓後的文件剪切到usr/local目錄下麵 並改名為jdk8

   mv jdk1.8_152 ../jdk8

4.配置環境變數

vim /etc/profile

#在文件末尾追加如下代碼
JAVA_HOME=/usr/local/jdk8
JRE_HOME=/usr/local/jdk8/jre
CLASS_PATH=.:$JAVA_HOME/lib
PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH
export JAVA_HOME JRE_HOME PATH CLASS_PATH 

#追加完成後更新配置
source /etc/profile
#查看是否安裝成功 顯示如下內容即ok
[root@VM_177_101_centos conf]# java -version
java version "1.8.0_161"
Java(TM) SE Runtime Environment (build 1.8.0_161-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.161-b12, mixed mode)