ubuntu在线安装JDK8

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我是靠谱客的博主开心海燕，最近开发中收集的这篇文章主要介绍ubuntu在线安装JDK8，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

ubuntu 安装 JDK

=============================================

推荐一种新的oracle在线安装方式

su -

echo "deb http://ppa.launchpad.net/webupd8team/java/ubuntu xenial main" | tee /etc/apt/sources.list.d/webupd8team-java.list

echo "deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu xenial main" | tee -a /etc/apt/sources.list.d/webupd8team-java.list

apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys EEA14886

apt-get update

apt-get install oracle-java8-installer

exit

或者直接：

sudo apt-add-repository ppa:webupd8team/java
sudo apt-get update

sudo apt-get install oracle-java8-installer

如果安装中出现错误，未成功，可参考：

oracle java 官网地址

http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

ubuntu 源地址（包含说明）

https://launchpad.net/~webupd8team/+archive/ubuntu/java

I think that your download is corrupted . you have to remove the corrupted package first by code :

sudo apt-get purge oracle-java8-installer

或者：

sudo dpkg -P oracle-java8-installer
sudo apt-get -f install

Clean your apt :

sudo apt clean

Remove and reimport the ropsitory :

sudo add-apt-repository --remove ppa:webupd8team/java
sudo apt-get update
sudo apt-add-repository ppa:webupd8team/java
sudo apt-get update

Install your package again :

sudo apt-get install oracle-java8-installer

Enjoy it bro ! if the problem hasn't solved try using VPN . Maybe there is a filtering between you and the oracle website

如果执行以上操作依然由于网络问题下载文件包失败而不能安装，那么可以通过手动下载的方式，辅助安装：

Try to do what helped me in similiar case:

go to Oracle JDK 8 download page and download exactly same version of jdk that oracle-java8-installer tried to download. In your case it's jdk-8u20-linux-x64.tar.gz. So you should download from: http://www.oracle.com/technetwork/java/javase/downloads/java-archive-javase8-2177648.html
copy jdk-8u20-linux-x64.tar.gz to folder: /var/cache/oracle-jdk8-installer/

try install oracle-java8-installer:

sudo apt-get install oracle-java8-installer

This should fix the problem.

=============================================

　　具体步骤参详了如下链接：

http://blog.csdn.net/yang_hui1986527/article/details/6677450

　　1、到 Sun 的官网下载

http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html

　　选择 accept license，然后选择适合自己机型的JDK下载。

　　2、解压文件，修改文件名

$ sudo mkdir /usr/lib/jvm
$ sudo tar zxvf jdk-7u21-linux-i586.tar.gz -C /usr/lib/jvm
$ cd /usr/lib/jvm
$ sudo mv jdk1.7.0_21 java

　　3、添加环境变量

$ sudo vim ~/.bashrc

　　加入如下内容

export JAVA_HOME=/usr/lib/jvm/java
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

　　4、配置默认JDK版本

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/java-7-sun/bin/java 300
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/java-7-sun/bin/javac 300
sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/java-7-sun/bin/jar 300
sudo update-alternatives --install /usr/bin/javah javah /usr/lib/jvm/java-7-sun/bin/javah 300
sudo update-alternatives --install /usr/bin/javap javap /usr/lib/jvm/java-7-sun/bin/javap 300

查看配置结果，执行代码：

[plain] 

viewplain
 copy
 sudo update-alternatives --config java  

系统会列出各种JDK版本

系统会列出各种JDK版本，如下所示：

 有 3 个候选项可用于替换 。  
   
   
   选择       路径                                    优先级  状态  
 ------------------------------------------------------------  
 * 0            /usr/lib/jvm/java-6-openjdk/jre/bin/java   1061      自动模式  
   1            /usr/lib/jvm/java-6-openjdk/jre/bin/java   1061      手动模式  
   2            /usr/lib/jvm/java-6-sun/jre/bin/java       63        手动模式  
   3            /usr/lib/jvm/java-7-sun/bin/java           300       手动模式  
   
   
 要维持当前值[*]请按回车键，或者键入选择的编号：3  
 update-alternatives: 使用 /usr/lib/jvm/，于 手动模式 中。  