这里选用jdk-8u131，可用参考这个包名去官方下载，参考下载地址为：
https://www.oracle.com/java/technologies/downloads/#java8
root@ubuntu:/usr/local/java# ls jdk-8u131-linux-x64.tar.gz将包放置指定的目录并解压
这里放置为/usr/local/java，如果java目录不存在则自己mkdir java一下
在压缩包目录直接操作如下：
tar -zxvf jdk-8u131-linux-x64.tar.gz
目录结构如图：
root@ubuntu:/usr/local/java/jdk1.8.0_131# ls COPYRIGHT LICENSE README.html THIRDPARTYLICENSEREADME-JAVAFX.txt THIRDPARTYLICENSEREADME.txt bin db include javafx-src.zip jre lib man release src.zip root@ubuntu:/usr/local/java/jdk1.8.0_131# pwd /usr/local/java/jdk1.8.0_131全局生效
将下面这几句放到最后保存
root@ubuntu:/usr/local/java/jdk1.8.0_131# vim /etc/profile export JAVA_HOME=/usr/local/java/jdk1.8.0_131 export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar export PATH=$PATH:$JAVA_HOME/bin验证生效
root@ubuntu:/usr/local/java# java -version java version "1.8.0_131" Java(TM) SE Runtime Environment (build 1.8.0_131-b11) Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)
