安装oracle提供的java8环境

一. 配置源

$ sudo vi /etc/apt/sources.list.d/java-8-debian.list

deb http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main
deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys EEA14886

可能会报错

➜  ~ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys EEA14886
Executing: /tmp/apt-key-gpghome.PTWZ4ixZ5e/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys EEA14886
gpg: failed to start the dirmngr '/usr/bin/dirmngr': 没有那个文件或目录
gpg: connecting dirmngr at '/tmp/apt-key-gpghome.PTWZ4ixZ5e/S.dirmngr' failed: 没有那个文件或目录
gpg: keyserver receive failed: No dirmngr

解决办法

$ sudo apt-get install dirmngr

二. 安装

更新源 ``sh $ sudo apt-get update

查看
```sh
$ sudo apt-cache search oracle-java
oracle-java8-installer - Oracle Java(TM) Development Kit (JDK) 8
oracle-java8-set-default - Set Oracle JDK 8 as default Java
oracle-java8-unlimited-jce-policy - Unlimited JCE Policy for Oracle Java 8

安装

$ sudo apt-get install oracle-java8-installer

安装过程中会有两个选择[是]

安装完成后验证安装结果

$ java -version
java version "1.8.0_201"
Java(TM) SE Runtime Environment (build 1.8.0_201-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.201-b09, mixed mode)

删除openjdk

$ dpkg -l |  grep openjdk
ii  openjdk-8-jre:amd64                   8u212-b01-1~deb9u1                amd64        OpenJDK Java runtime, using Hotspot JIT
ii  openjdk-8-jre-headless:amd64          8u212-b01-1~deb9u1                amd64        OpenJDK Java runtime, using Hotspot JIT (headless)
 
$ sudo apt-get remove openjdk-8-jre openjdk-8-jre-headless