過程如下：
在Oracle官網下載1.8版本的JDK檔案 jdk-8u121-linux-x64.rpm
然後進行升級

# rpm -qa jdk
jdk-1.7.0_80-fcs.x86_64
# rpm -e --nodeps jdk-1.7.0_80-fcs.x86_64
# rpm -ivh jdk-8u121-linux-x64.rpm
# 修改/etc/profile檔案 
# vim /etc/profile
JAVA_HOME=/usr/java/jdk1.8.0_121
PATH=$JAVA_HOME/bin:$PATH
export JAVA_HOME PATH
＃　重新ｓｏｕｒｃｅ
# source /etc/profile
 

# 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)