jdk.md

jdk安装

• 下载jdk 下载地址：https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

• 创建java目录

    $ mkdir /usr/local/java
    $ cd /usr/local/java
    $ tar -zxvf jdk-8u181-linux-x64.tar.gz
  

• 创建环境变量

    $ vim /etc/profile
        JAVA_HOME=/usr/local/java/jdk1.8.0_181
        JRE_HOME=${JAVA_HOME}/jre
        CLASSPATH=.:${JAVA_HOME}/lib/dt.jar:${JAVA_HOME}/lib/tools.jar:${JRE_HOME}/lib
  
        export JAVA_HOME JRE_HOME CLASSPATH
        export PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
    $ source /etc/profile
  

• 测试

    $ java -version
    java version "1.8.0_181"
    Java(TM) SE Runtime Environment (build 1.8.0_181-b13)
    Java HotSpot(TM) 64-Bit Server VM (build 25.181-b13, mixed mode)