Ubuntu安装Oracle JDK

查看是否已安装jdk

以下信息说明未安装

ubuntu@VM-16-6-ubuntu:/var$ java -version
The program 'java' can be found in the following packages:
 * default-jre
 * gcj-5-jre-headless
 * openjdk-8-jre-headless
 * gcj-4.8-jre-headless
 * gcj-4.9-jre-headless
 * openjdk-9-jre-headless
Try: sudo apt install <selected package>

执行以下命令进行安装

ubuntu@VM-16-6-ubuntu:/var$ sudo apt-get install python-software-properties

ubuntu@VM-16-6-ubuntu:/var$ sudo add-apt-repository ppa:webupd8team/java

ubuntu@VM-16-6-ubuntu:/var$ sudo apt-get update

ubuntu@VM-16-6-ubuntu:/var$ sudo apt-get install oracle-java8-installer

最后一个命令会弹出图形化界面，主要是让你接受Jdk License

设置 $JAVA_HOME

1. 查看java路径

ubuntu@VM-16-6-ubuntu:~$ sudo update-alternatives --config java
There is 1 choice for the alternative java (providing /usr/bin/java).

  Selection    Path                                     Priority   Status
------------------------------------------------------------
  0            /usr/lib/jvm/java-8-oracle/jre/bin/java   1081      auto mode
* 1            /usr/lib/jvm/java-8-oracle/jre/bin/java   1081      manual mode

copy上面path路径/usr/lib/jvm/java-8-oracle/jre/bin/java

2. 更新配置

sudo vi /etc/environment

在文件内插入一行JAVA_HOME="/usr/lib/jvm/java-8-oracle/jre/bin/java"

ubuntu@VM-16-6-ubuntu:~$ source /etc/environment
ubuntu@VM-16-6-ubuntu:~$ echo $JAVA_HOME
/usr/lib/jvm/java-8-oracle/jre/bin/java

安装完成