升级java8---from centos

安装步骤:
wget http://10.107.2.44/jdk-8u111-linux-x64.tar.gz
root@ute-image:~# tar zxf jdk-8u111-linux-x64.tar.gz
root@ute-image:~# mv jdk1.8.0_111/ /usr/lib/jvm/
root@ute-image:~# vi /etc/profile     //添加本地变量,在最后一行
export JAVA_HOME=/usr/lib/jvm/jdk1.8.0_111/
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH
root@ute-image:~# source /etc/profile
root@ute-image:~# update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.8.0_111/jre/bin/java 1100
root@ute-image:~# update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.8.0_111/bin/javac 1100  

root@ute-image:~# update-alternatives --config java
There are 2 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                             root@ute-image:~# update-alternatives --config javac
There are 2 choices for the alternative javac (providing /usr/bin/javac).

  Selection    Path                                    Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/jdk1.8.0_111/bin/javac      1100      auto mode
  1            /usr/lib/jvm/j2sdk1.7-oracle/bin/javac   317       manual mode
  2            /usr/lib/jvm/jdk1.8.0_111/bin/javac      1100      manual mode

Press enter to keep the current choice[*], or type selection number:
          Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/jdk1.8.0_111/jre/bin/java      1100      auto mode
  1            /usr/lib/jvm/j2sdk1.7-oracle/jre/bin/java   317       manual mode
  2            /usr/lib/jvm/jdk1.8.0_111/jre/bin/java      1100      manual mode

Press enter to keep the current choice[*], or type selection number: java8