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java下载地址：http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
下载64为tar.gz版。
安装在opt目录下，并做软链接
tar -xzvf jdk-8u131-linux-x64.tar.gz
mkdir /opt/java /opt/java/jdk8
mv jdk1.8.0_131 /opt/java/jdk8/
chown -R root:root /opt/java/jdk8/jdk1.8.0_131
ln -s /opt/java/jdk8/jdk1.8.0_131 /opt/java/jdk8/default
ln -s /opt/java/jdk8/default /opt/java/default
并设置环境变量JAVA_HOME和PATH
vim /etc/profile
增加以下配置
export JAVA_HOME=/opt/java/default
export PATH=$PATH:$JAVA_HOME/bin